All tools
190 tools across 16 categories.
Developer Tools
39 toolsTools every web developer needs.
- JSON FormatterPretty-print, minify, and validate JSON. Detects syntax errors with line numbers and supports nested structures of any depth.
- JSON DiffCompare two JSON values semantically. Ignores key order; shows added, removed, and changed fields with their JSONPath — great for diffing API responses and config files.
- JSON to XML ConverterConvert JSON objects and arrays to well-formed XML. Maps object keys to elements, array items to repeated elements, with optional root wrapper.
- JSON to YAML ConverterConvert JSON to clean indented YAML for Kubernetes manifests, Docker Compose, CI configs, and Helm charts. Preserves nested structures.
- JSON to CSV ConverterConvert JSON arrays to CSV with automatic header detection from object keys. Handles nested values and arbitrary delimiters.
- JSON to TypeScriptGenerate TypeScript interfaces and types from any sample JSON. Handles nested objects, arrays, optional fields, and mixed types. Paste JSON, copy the interface.
- YAML FormatterFormat and validate YAML for config files, Kubernetes manifests, Docker Compose, and CI pipelines. Normalizes indentation and surfaces syntax errors.
- YAML to JSON ConverterConvert YAML to JSON for APIs, config files, and pipelines. Supports indented mappings, sequences, scalars, and nested objects.
- YAML to XML ConverterConvert YAML to well-formed XML for legacy integrations. Preserves nested mappings and sequences as nested elements with text values.
- YAML to CSV ConverterConvert YAML arrays of records to CSV. Flattens nested objects with dot-notation column names so spreadsheet tools can read structured YAML data.
- XML FormatterFormat, indent, and validate XML documents. Detects malformed tags, unclosed elements, and bad attributes with clear line-level error messages. Great for config and API work.
- XML to JSON ConverterConvert XML to JSON for legacy API integration, SOAP responses, and config migration. Handles attributes, namespaces, and text content.
- XML to YAML ConverterConvert XML documents to clean indented YAML. Handles attributes, repeated elements, and text content; great for migrating legacy configs.
- XML to CSV ConverterFlatten repeated XML elements into CSV rows with attributes and child text as columns. Great for opening XML data in Excel or Sheets.
- CSV to JSON ConverterConvert CSV to a JSON array of objects. Uses the first row as keys, handles quoted values, and detects common delimiters automatically.
- CSV to XML ConverterConvert CSV rows into XML elements with column headers as tag names. Useful for Excel exports, legacy systems, and ETL pipelines.
- CSV to YAML ConverterConvert CSV to YAML for use in config files, Ansible playbooks, and Kubernetes ConfigMaps. Uses the header row as YAML keys.
- Token Counter for GPT, Claude, LlamaCount tokens for ChatGPT, GPT-4o, Claude, Llama, and Gemini before hitting context limits. Shows per-model token count, character count, and approximate API cost.
- LLM JSON Schema ValidatorValidate JSON Schemas for OpenAI strict mode, function calling, Anthropic tool use, and Gemini controlled generation. Catch vendor-specific schema errors before shipping.
- JWT DecoderDecode JSON Web Tokens and inspect the header, payload, and signature. Paste any JWT to see claims, expiry, issuer, and algorithm — no secret key needed to decode.
- JWT GeneratorSign JSON Web Tokens with HS256, HS384, or HS512. Set custom claims, expiry, and issuer — then copy the signed token for use in API testing or auth flows.
- Regex TesterTest JavaScript regular expressions live with instant match highlighting. Supports all JS regex flags (g, i, m, s, u) and shows match groups, indices, and global matches.
- SQL FormatterPretty-print and format SQL for any major dialect — MySQL, PostgreSQL, SQLite, T-SQL, and more. Normalizes indentation, keywords, and spacing for readable, consistent queries.
- URL Encoder/DecoderPercent-encode and decode URLs and query string values. Handles full URLs or individual components — paste any URL to encode special characters or decode percent-encoded strings.
- URL ParserDecompose any URL into its components — protocol, host, port, path, query parameters, and fragment. Great for debugging redirect chains, API endpoints, and UTM parameters.
- Curl to Code ConverterPaste a curl command, get equivalent code in JavaScript (fetch/axios), Python (requests), or Go (net/http). Handles headers, JSON bodies, basic auth, and form data.
- HTTP Status Code ReferenceSearchable reference for every HTTP status code with plain-English summaries and the gotchas devs actually hit: 301 vs 308, 401 vs 403, 404 vs 410, 400 vs 422.
- Base64 Encoder/DecoderEncode text or binary data to Base64 and decode Base64 strings back to text. Supports standard and URL-safe Base64. Useful for data URIs, API tokens, and email attachments.
- Image to Base64Convert any image file into a Base64 data URI for embedding directly in CSS or HTML. Supports PNG, JPG, GIF, WebP, and SVG. No upload — processed entirely in your browser.
- String Escape/UnescapeEscape and unescape strings for JSON, JavaScript, HTML, and SQL. Handles special characters, backslashes, quotes, newlines, and Unicode escape sequences instantly.
- HTML Entities EncoderEncode text to HTML entities and decode entities back to text. Converts angle brackets, ampersands, quotes, and other special characters to safe equivalents for use in HTML templates and CMS workflows.
- HTML EditorWrite HTML with live preview side-by-side. Syntax-highlighted editor with formatted source view — useful for testing snippets, email templates, or quick mockups in your browser.
- Markdown PreviewLive markdown editor with GitHub-flavored rendering. Supports tables, code blocks, task lists, and strikethrough. Great for drafting README files or documentation.
- Color PickerPick any color visually and copy the value in HEX, RGB, HSL, or OKLCH. Enter a hex code to convert to other formats. Includes a color wheel, shade slider, and clipboard copy.
- CSS MinifierMinify CSS for production by stripping whitespace, comments, and redundant rules. Paste your stylesheet and get the compressed output ready to ship or inline.
- JS MinifierMinify JavaScript using Terser — removes whitespace, shortens variable names, and removes dead code. Paste your JS and get a production-ready compressed bundle.
- Cron Expression Parser — Explain & Preview RunsExplain any cron expression in plain English and preview the next run times. Supports 5-field crontab, 6-field, and @hourly/@daily/@weekly shortcuts. Free, no signup.
- .gitignore GeneratorBuild a .gitignore file from community templates for any language or framework — Node, Python, Go, Java, React, Rails, and more. Select multiple templates and merge them in one click.
- .htaccess GeneratorGenerate common Apache .htaccess snippets — redirects, URL rewrites, HTTPS enforcement, custom error pages, CORS headers, and caching rules. Copy the snippet you need.
Text & String
10 toolsManipulate, count, compare, and clean text.
- Text DiffSide-by-side diff comparison of two text blocks with line-by-line highlighting. Shows added, removed, and changed lines — useful for comparing document versions or config files.
- Remove Duplicate LinesRemove duplicate lines from any list or text block while preserving original order. Optionally trim whitespace and ignore case before deduplication. Results update instantly.
- Sort Lines / Sort List OnlineSort a list of words, names, or numbers — alphabetically A→Z or Z→A, numerically, or randomly. Paste any list and get sorted results instantly.
- Word & Text CounterCount words, characters, lines, sentences, and reading time instantly. Paste any text — article, essay, or code — and get a live breakdown. Also shows unique word count and average word length.
- Case ConverterConvert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case. Paste any text and switch case in one click.
- Text ReverserReverse the characters, words, or individual lines of any text. Useful for debugging palindromes, creating mirror text, or just having fun with strings.
- Find & ReplaceBulk find and replace across any block of text with plain text or regex patterns. Supports case-sensitive matching, global replace, and regular expression capture groups.
- Text to URL SlugConvert any title or string into a clean, hyphenated URL slug. Strips accents, punctuation, and spaces. Useful for generating SEO-friendly URLs and blog post paths.
- Lorem Ipsum GeneratorGenerate paragraphs, sentences, or words of classic lorem ipsum placeholder text. Choose the amount and copy instantly — useful for mockups, wireframes, and design prototypes.
- Morse Code TranslatorTranslate text to Morse code and Morse code back to text, with audio playback of the dots and dashes. Supports the full International Morse Code alphabet and numbers.
List Tools
8 toolsSet operations, filtering, and clipboard transforms for lists.
- List StatsGet statistics on any list: total count, unique count, min and max line length, average length, and the longest and shortest items. Useful for auditing data before further processing.
- List Set OperationsPerform set operations on two lists: union, intersection, difference, A-only, B-only, and symmetric difference. Paste two lists and choose the operation — results update instantly.
- List FilterKeep or remove lines matching a plain-text substring or regular expression. Useful for filtering log output, cleaning data, or extracting matching lines from large lists.
- Comma to Lines ConverterConvert between comma-separated values and one-item-per-line format. Handles quoted fields, trims whitespace, and removes duplicates. Paste CSV data, get a clean list — and back.
- List to JSON ArrayConvert a one-item-per-line list into a JSON array of strings and back again. Handles quoting and escaping automatically — useful for turning clipboard lists into API payloads.
- Column PickerExtract a specific column from tab-separated or comma-separated rows. Enter column index or name — useful for pulling a single field from TSV exports or pasted spreadsheet data.
- Prefix / Suffix WrapperWrap every line with a custom prefix and suffix. Useful for building SQL IN clauses ('value'), quoting shell arguments, wrapping HTML tags, or generating code from a list.
- Number Sequence GeneratorExpand range patterns like 1..100 or 0,2,4..20 into complete numeric lists. Supports step size, comma-separated output, and custom separators — great for test data and scripting.
Date & Time
8 toolsDate math, age, and timezone tools.
- Days Between Dates — How Many Days CalculatorFind how many days are between two dates — plus weeks, months, and years. Counts calendar days inclusive or exclusive. Free, runs in your browser, no signup.
- Time Zone Converter — Convert Time Across ZonesConvert any time across 10+ world time zones instantly. DST-aware — New York, London, Tokyo, Kolkata, Sydney & more. Runs locally in your browser, no signup.
- Unix Timestamp ConverterConvert Unix epoch timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. Instantly shows UTC and local time — no signup needed.
- Date CalculatorAdd or subtract days, weeks, months, or years from any date to find a future or past date. Handles leap years correctly — useful for deadlines, scheduling, and date math.
- Week NumberFind the ISO 8601 week number for any date and see which dates fall in that week. Useful for project planning, payroll periods, and international reporting standards.
- Countdown TimerLive countdown to any future date or event — shows days, hours, minutes, and seconds remaining. Set a target date and share the link or bookmark it for quick access.
- StopwatchOnline stopwatch with lap tracking. Start, pause, and record lap splits — all in your browser. No install needed. Accurate to milliseconds for timing tasks, workouts, or experiments.
- Age CalculatorCalculate your exact age in years, months, and days from your date of birth. Also shows the next birthday countdown and total days, hours, and minutes lived.
Math
20 toolsCalculators for everyday and advanced math.
- Percentage CalculatorCalculate what percent of a number is, find percent change, and reverse-calculate any percentage. Three modes — pick the one that matches your problem, get the answer instantly.
- Average CalculatorCalculate mean, median, mode, range, sum, min, and max for any list of numbers. Paste in grades, scores, or measurements — results update instantly.
- Fraction CalculatorAdd, subtract, multiply, and divide fractions with full step-by-step results showing the LCD, equivalent fractions, and simplified answer. Handles mixed numbers and improper fractions.
- Ratio CalculatorSimplify ratios to lowest terms, convert a ratio to a decimal, scale to any value, and compare two ratios. For recipes, map scales, and aspect ratios.
- Rounding CalculatorRound numbers to the nearest integer, decimal place, or significant figure. Choose round half-up, half-down, or toward zero. Handles large and small numbers precisely.
- Root CalculatorCalculate square roots, cube roots, and any nth root with high precision. Handles perfect squares and irrational results — shows the decimal approximation and the radical form.
- Exponent CalculatorRaise any base to any power — including negative bases, decimal exponents, and fractional powers. Shows the full numeric result with high precision for scientific and engineering work.
- Logarithm CalculatorCalculate log base 10, natural log (ln), log base 2, and log to any custom base. Shows step-by-step working — useful for chemistry, information theory, and general math.
- Antilog CalculatorCalculate the antilog (inverse logarithm) for any base — base 10, base e (natural), or a custom base. Converts log values back to their original numbers instantly.
- GCF / GCD CalculatorFind the greatest common factor (GCF) — also called GCD — of two or more integers. Uses the Euclidean algorithm and shows step-by-step working. Useful for simplifying fractions.
- LCM CalculatorFind the least common multiple of any set of integers. Shows prime factorization and step-by-step working — useful for adding fractions, scheduling problems, and number theory.
- Factorial CalculatorCalculate n! for any integer using big-int math that handles very large numbers precisely. Shows the full expanded result — useful for combinatorics, statistics, and algorithm analysis.
- Permutation & Combination CalculatorCalculate nPr (permutations) and nCr (combinations) with a step-by-step formula breakdown. Enter n and r to see the count, formula expansion, and intermediate values.
- Probability CalculatorCalculate the probability of single events and combined events (and/or). Enter counts or fractions to find probability, odds, and complementary probability in one step.
- Standard Deviation CalculatorCalculate population and sample standard deviation, variance, and mean for any data set. Paste numbers one per line or comma-separated — results and formula shown instantly.
- Triangle CalculatorSolve any triangle from sides or angles using the law of sines and cosines. Enter any three values (SSS, SAS, ASA, AAS, or SSA) and get all remaining sides, angles, and area.
- Circle CalculatorCalculate the area, circumference, diameter, and radius of a circle from any one known value. Instant results with formulas shown — useful for geometry, engineering, and design.
- Equation SolverSolve linear equations (ax + b = c) and quadratic equations (ax² + bx + c = 0) symbolically. Shows step-by-step working and real or complex roots for quadratics.
- Matrix CalculatorAdd, subtract, multiply, transpose, and invert matrices of any size. Shows intermediate steps for multiplication and Gaussian elimination for matrix inversion.
- Scientific CalculatorFull scientific calculator with trigonometric functions (sin, cos, tan), logarithms, exponents, factorials, and constants. Supports degree and radian mode.
Unit Converters
19 toolsConvert between units of length, weight, temperature, and more.
- Length ConverterConvert length between meters, feet, miles, kilometers, inches, centimeters, yards, and nautical miles. Instant results — useful for travel, construction, and international unit conversion.
- Weight ConverterConvert weight between kilograms, pounds, ounces, grams, stones, and metric tons. Handles both metric and imperial units — useful for cooking, shipping, and fitness tracking.
- Area ConverterConvert area between square meters, square feet, acres, hectares, square kilometers, and square miles. Useful for real estate, land measurement, and engineering projects.
- Volume ConverterConvert volume between liters, gallons, milliliters, cubic meters, fluid ounces, cups, and pints. Handles both US and UK gallons — useful for cooking, chemistry, and engineering.
- Temperature ConverterConvert temperature between Celsius, Fahrenheit, and Kelvin with instant results. Includes common reference points — freezing, body temperature, boiling — for quick sanity checks.
- Speed ConverterConvert speed between mph, km/h, knots, m/s, and feet per second. Useful for travel, aviation, maritime, and physics — handles all common speed units instantly.
- Time ConverterConvert time between seconds, minutes, hours, days, weeks, months, and years. Useful for project estimates, API timeout values, and unit conversions in calculations.
- Energy ConverterConvert energy between joules, calories, kilocalories, kilowatt-hours, BTU, and electron volts. Useful for physics, nutrition, and engineering calculations.
- Power ConverterConvert power between watts, kilowatts, megawatts, horsepower, BTU/hour, and foot-pounds per second. Useful for electrical engineering, automotive, and HVAC calculations.
- Force ConverterConvert force between newtons, pounds-force, kilonewtons, dynes, and kilograms-force. Useful for physics, mechanical engineering, and structural calculations.
- Pressure ConverterConvert pressure between pascals, bar, psi, atm, mmHg, and kilopascals. Useful for meteorology, hydraulics, pneumatics, and tire pressure conversions.
- Frequency ConverterConvert frequency between hertz, kilohertz, megahertz, gigahertz, and RPM. Useful for electronics, signal processing, audio engineering, and mechanical rotation.
- Angle ConverterConvert angles between degrees, radians, and gradians. Instant conversion with formulas shown — useful for trigonometry, navigation, engineering, and CAD work.
- Data Storage ConverterConvert data storage between bytes, KB, MB, GB, TB, and PB — in both binary (1 KB = 1024 B) and decimal (1 KB = 1000 B) modes. Useful for storage planning and file size comparisons.
- Currency ConverterConvert between 30+ world currencies using live exchange rates updated daily from the European Central Bank. No signup — get instant results for USD, EUR, GBP, JPY, INR, and more.
- Fuel Economy ConverterConvert fuel economy between MPG (US and UK), L/100km, and km/L. Useful for comparing car specs across countries or understanding international fuel consumption ratings.
- Paper Size ConverterConvert ISO A and B series paper sizes and US Letter, Legal, and Tabloid between millimetres, inches, points, and pixels at any DPI. Includes a full reference table of standard dimensions.
- Shoe Size ConverterConvert shoe sizes between US, UK, EU, and foot length in cm — for both men's and women's sizing. Includes a full reference chart for all standard international shoe size systems.
- Clothing Size ConverterConvert clothing sizes between US, UK, EU, and AU for men's and women's tops, bottoms, and dresses. Includes reference charts for chest, waist, and hip measurements.
Number & Code
8 toolsBinary, hex, ASCII, and base converters.
- Binary ⇄ DecimalConvert between binary and decimal numbers in both directions. Supports signed integers and shows the step-by-step positional value breakdown for each conversion.
- Binary ⇄ HexConvert between binary and hexadecimal notation. Handles any length input and groups binary output into nibbles (4-bit groups) for readability.
- Hex ⇄ DecimalConvert between hexadecimal and decimal numbers. Supports uppercase and lowercase hex input — useful for color codes, memory addresses, and network protocols.
- Octal ⇄ DecimalConvert between octal (base 8) and decimal (base 10). Useful for Unix file permissions, legacy computing, and programming exercises involving number systems.
- Number Base ConverterConvert any number between any two bases from 2 (binary) to 36. Enter the source base, target base, and number — ideal for computer science and custom encoding schemes.
- ASCII ConverterConvert text to ASCII character codes and ASCII codes back to text. Shows decimal, hexadecimal, and binary representations for each character simultaneously.
- Roman Numeral ConverterConvert integers to Roman numerals and Roman numerals back to integers. Supports 1–3999 with proper subtractive notation (IV, IX, XL, XC, CD, CM).
- BCD ConverterConvert decimal numbers to Binary-Coded Decimal (BCD) and back. Shows the 4-bit group encoding for each decimal digit — useful for electronics and embedded systems.
Generators
9 toolsPasswords, IDs, QR codes, and more.
- Password GeneratorGenerate strong, random passwords with custom length, uppercase, lowercase, numbers, and symbols. Built-in strength meter. Nothing is stored — all generation happens in your browser.
- UUID GeneratorGenerate random UUID v4 strings instantly — one or in bulk. Copy-paste ready GUIDs for databases, APIs, and unique identifiers.
- QR Code GeneratorCreate QR codes for URLs, plain text, phone numbers, or contact cards (vCard). Download as PNG. Free QR code generator — no signup, no watermark, works in your browser.
- Barcode GeneratorGenerate EAN-13, EAN-8, UPC-A, Code 128, and Code 39 barcodes from any input. Download as SVG or PNG — useful for product labeling, inventory, and retail applications.
- Random Number GeneratorGenerate a random number in any range — integers or decimals, with optional no-repeat mode. Useful for picking lottery numbers, random sampling, and game mechanics.
- Dice RollerRoll any combination of dice using standard RPG notation (e.g. 3d6, 2d10+5). Shows individual die results and totals — perfect for tabletop games and probability demonstrations.
- Coin FlipperFlip a virtual coin and track heads vs. tails statistics over many flips. Useful for teaching probability, settling disputes, or making random decisions quickly.
- Random Color GeneratorGenerate a random color or a harmonious palette using complementary, triadic, or analogous color rules. Shows HEX, RGB, and HSL values — great for design inspiration.
- Random Name GeneratorGenerate random first and last names from many cultures and regions — English, Spanish, Japanese, Chinese, and more. Useful for placeholders, test data, and creative writing.
Design & CSS
9 toolsColor, typography, spacing, and CSS generators.
- WCAG Contrast CheckerCheck foreground/background color contrast ratios against WCAG 2.1 AA (4.5:1) and AAA (7:1) standards. Enter HEX or RGB values — see pass/fail for normal and large text.
- CSS Gradient GeneratorBuild linear and radial CSS gradients visually with a live preview and copy-ready CSS output. Control colors, stops, angle, and shape — no code required.
- Image Color PaletteExtract a dominant color palette from any uploaded image. Shows the top colors with HEX values — useful for brand identity, design matching, and color inspiration.
- Box Shadow GeneratorCompose CSS box-shadow visually — adjust X/Y offset, blur, spread, and color with a live preview. Copy the final CSS rule with one click. Supports multiple shadow layers.
- Border Radius GeneratorBuild CSS border-radius values visually — symmetric, asymmetric, or fully custom per-corner shapes. Live preview with copy-ready CSS output for any border-radius combination.
- Type Scale GeneratorGenerate a modular type scale from a base font size and ratio (Major Third, Perfect Fourth, Golden Ratio, and more). Outputs CSS custom properties for a consistent typographic system.
- PX ↔ REM ConverterConvert between pixels and rems for any base font size (default 16px). Paste a list of values to convert all at once — useful for responsive CSS and design token work.
- Spacing Scale GeneratorBuild a consistent spacing scale for design systems — enter a base unit and multiplier to generate a full set of spacing tokens in px and rem, ready for Tailwind or CSS variables.
- Aspect Ratio CalculatorCalculate width or height to preserve any aspect ratio — 16:9 widescreen, 4:3, 1:1, or custom. Great for responsive images, video embeds, and UI layouts.
Network & Security
4 toolsNetworking, certificates, hashing, and security utilities.
- Password Strength CheckerEstimate password entropy and time-to-crack using the zxcvbn algorithm. Shows realistic crack time estimates under different attack scenarios — far more accurate than simple strength bars.
- Hash GeneratorGenerate MD5, SHA-1, SHA-256, and SHA-512 hashes of any string. Useful for checksums, data integrity verification, and understanding hash output lengths for each algorithm.
- SSL Certificate DecoderPaste a PEM-encoded SSL/TLS certificate to inspect issuer, subject, SANs, validity period, public key, and signature algorithm. Everything runs in your browser — no certificate is uploaded.
- IP/CIDR Subnet CalculatorCompute subnet range, network mask, broadcast address, and usable host count for any IPv4 CIDR block. Also shows all subnets when you split a block — useful for network planning.
Personal Finance
13 toolsLoans, taxes, salary, and everyday money decisions.
- Mortgage CalculatorCalculate your monthly mortgage payment including principal, interest, taxes, and insurance (PITI). View full amortization schedule and see how extra payments affect payoff date.
- Loan CalculatorCalculate monthly loan payment, total interest paid, and full amortization schedule for any loan amount, interest rate, and term. Works for auto loans, personal loans, and student loans.
- EAR ↔ APR CalculatorConvert between APR and effective annual rate (EAR) at any compounding frequency — monthly, daily, continuous. Shows how compounding frequency changes the true cost of a loan.
- Salary CalculatorConvert salary between hourly, daily, weekly, bi-weekly, monthly, and annual rates. Useful for comparing job offers, freelance rates, and understanding your true annual income.
- Tip CalculatorCalculate tip amount and split the total bill between any number of people. Choose from common tip percentages or enter a custom rate — great for restaurants and group outings.
- Sales Tax CalculatorCalculate sales tax on any purchase or reverse-calculate the pre-tax price from a total. Enter price and tax rate to see tax amount and final total — useful for any US state rate.
- Discount CalculatorCalculate the final price after a percentage discount, the discount amount saved, and the effective discount rate from original and sale prices. Great for shopping and pricing decisions.
- Compound InterestCalculate future value with compound interest and optional monthly contributions. Shows year-by-year growth, total contributions, and total interest earned — useful for savings planning.
- ROI CalculatorCalculate return on investment (ROI) in both absolute and annualized percentage form. Enter initial cost and final value to see simple ROI and CAGR for any holding period.
- CAGR CalculatorCalculate compound annual growth rate (CAGR) from beginning value, ending value, and number of years. The standard metric for measuring consistent investment or business growth over time.
- Inflation CalculatorCalculate how inflation erodes purchasing power over time. Enter an amount and two years to see the equivalent value in today's dollars — uses historical US CPI data.
- Margin & Markup CalculatorCalculate gross margin percentage, markup percentage, and cost or sale price from any two known values. Understand the difference between margin (of revenue) and markup (of cost).
- Annuity CalculatorCalculate present and future value of ordinary annuities and annuities due from payment, rate, and periods. Useful for valuing bonds, lease payments, pension income, and retirement planning.
Valuation, options, fixed income, and risk metrics for analysts.
- NPV & IRR CalculatorCalculate net present value and internal rate of return for any series of cash flows. Enter a discount rate and yearly cash flows to evaluate whether an investment creates value.
- WACC CalculatorCalculate weighted average cost of capital from equity cost, debt cost, tax rate, and capital structure weights. The standard discount rate for corporate DCF valuations.
- CAPM CalculatorCalculate the required return on equity using CAPM: risk-free rate + beta × equity risk premium. Used to estimate cost of equity for WACC and to assess whether a stock is fairly valued.
- Bond Pricing & YTMCalculate bond price, yield to maturity, Macaulay duration, and convexity for any fixed-coupon bond. Supports semi-annual and annual coupons — useful for fixed income analysis.
- Black-Scholes Options PricingCalculate call and put option prices and all five Greeks (delta, gamma, theta, vega, rho) using the Black-Scholes model. Enter spot price, strike, volatility, rate, and expiry.
- Sharpe Ratio CalculatorCalculate the Sharpe ratio (risk-adjusted return) from a return series and risk-free rate. Paste portfolio returns to see mean return, standard deviation, and Sharpe ratio.
Marketing & SEO
7 toolsAd math, conversion, A/B testing, and SEO helpers.
- SERP Snippet PreviewPreview how your page title and meta description will appear in Google search results. Shows the rendered SERP snippet with character counts and truncation warnings.
- UTM Link BuilderBuild clean UTM-tagged campaign URLs for Google Analytics tracking. Enter source, medium, campaign, term, and content — get a properly encoded URL to paste into your ads or emails.
- CPM / CPC / CTR CalculatorConvert between impressions, clicks, cost, CTR, CPM, and CPC for any ad campaign. Enter any two values to calculate the others — useful for planning and evaluating digital ad buys.
- ROAS CalculatorCalculate return on ad spend (ROAS), cost per acquisition (CPA), and the break-even ROAS needed to cover your cost of goods. Essential for evaluating paid search and social campaigns.
- Conversion Rate CalculatorCompute conversion rates from visitors and conversions, compare two rates, and calculate the confidence interval around each estimate. Useful for landing page and funnel analysis.
- A/B Test SignificanceRun a two-proportion z-test on A/B test results. Enter visitors and conversions for each variant to see p-value, statistical significance, relative lift, and minimum sample size guidance.
- LTV / CAC CalculatorCalculate customer lifetime value (LTV), customer acquisition cost (CAC), LTV:CAC ratio, and CAC payback period. Core SaaS and e-commerce metrics for assessing unit economics.
Health & Medical
13 toolsClinical formulas, dosing, and physiology calculators.
- BMI CalculatorCalculate Body Mass Index (BMI) in metric (kg/cm) or imperial (lbs/in). Instantly shows your BMI value and weight category — underweight, normal, overweight, or obese.
- Body Surface Area (BSA)Calculate body surface area using the Mosteller and DuBois formulas. Used clinically for chemotherapy dosing, burn assessment, and cardiac output calculations.
- Ideal Body WeightCalculate ideal body weight using the Devine, Robinson, and Hamwi formulas in metric and imperial units. Used in clinical dosing and nutritional assessment.
- Target Heart Rate ZonesCalculate heart rate training zones using the Karvonen formula from your age and resting heart rate. Shows 5 zones from light aerobic to maximum effort for exercise planning.
- eGFR CalculatorCalculate estimated glomerular filtration rate (eGFR) using the CKD-EPI 2021 equation. Used to stage chronic kidney disease from serum creatinine, age, and sex.
- Creatinine ClearanceCalculate creatinine clearance using the Cockcroft-Gault equation with optional adjusted body weight. Widely used for drug dose adjustments in renal impairment.
- Pregnancy Due DateCalculate estimated due date (EDD) and current gestational age using Naegele's rule from last menstrual period. Shows trimester and key milestone dates.
- Pediatric Dose (mg/kg)Convert weight-based mg/kg doses to total dose in mg or mL. Includes maximum dose safety checks — useful for nurses, pharmacists, and physicians calculating pediatric drug doses.
- IV Drip RateCalculate IV drip rate in drops per minute and flow rate in mL/hr for any infusion. Enter volume, time, and drop factor — essential for nursing and pharmacy calculations.
- Anion Gap CalculatorCalculate the anion gap from sodium, chloride, and bicarbonate, with optional albumin correction. Used to diagnose and classify metabolic acidosis in clinical settings.
- CHA₂DS₂-VASc ScoreCalculate the CHA₂DS₂-VASc stroke risk score for patients with atrial fibrillation. Shows score, annual stroke risk percentage, and anticoagulation threshold guidance.
- MELD ScoreCalculate the Model for End-Stage Liver Disease (MELD) score from bilirubin, creatinine, and INR. Used to prioritize liver transplant candidates by disease severity and 90-day mortality risk.
- Wells PE ScoreCalculate the Wells clinical prediction score for pulmonary embolism probability. Stratifies patients into low, intermediate, and high pre-test probability to guide imaging decisions.
PDF Tools
7 toolsMerge, split, convert, and edit PDF files — all in your browser.
- PDF MergeCombine multiple PDF files into one document. Drag to reorder pages, then download the merged PDF — no upload, processed entirely in your browser.
- PDF SplitSplit a PDF by page ranges or extract individual pages. Enter ranges like 1-3,5,7-9 or extract every page as a separate file — processed in your browser.
- PDF to ImagesConvert PDF pages to PNG or JPG images. Renders each page as a high-quality image you can download individually or as a ZIP — runs entirely in your browser.
- Images to PDFConvert JPG, PNG, or WebP images to a PDF document. Drag to reorder, choose page size and orientation, then download the PDF — no upload, runs in your browser.
- PDF RotateRotate PDF pages by 90°, 180°, or 270°. Apply rotation to all pages or specific pages — download the corrected PDF instantly, processed in your browser.
- PDF CompressReduce PDF file size by recompressing the document structure. No external server — compressed and downloaded directly in your browser.
- PDF Metadata ViewerView PDF metadata: title, author, creator, producer, creation date, modification date, and page count — instantly parsed in your browser without uploading anywhere.
Electrical & Electronics
10 toolsPractical calculators for circuits and electronics.
- Ohm's Law CalculatorSolve Ohm's Law (V = IR) for voltage, current, or resistance — enter any two values to find the third. Also calculates power (W) from the known values.
- Watts to AmpsConvert between watts, amps, and volts for AC and DC circuits. Handles single-phase and three-phase AC with power factor — useful for electrical load planning and wiring.
- Power CalculatorCalculate electrical power in watts from any two of voltage, current, or resistance. Uses P = VI, P = V²/R, and P = I²R — useful for circuit design and energy estimation.
- kVA CalculatorCalculate kVA, kW, and amperage for single-phase and three-phase electrical systems. Enter any two values to find the third — useful for generator sizing and transformer selection.
- Voltage DividerCalculate the output voltage of a two-resistor voltage divider. Enter input voltage and both resistor values — useful for sensor biasing, ADC reference voltages, and signal conditioning.
- Resistor Color CodeDecode 4-band, 5-band, and 6-band resistor color codes to find resistance in ohms, tolerance, and temperature coefficient. Also converts a resistance value to color bands.
- Capacitor Calculator — Series & Parallel CapacitanceCalculate equivalent capacitance for capacitors in series and parallel, plus RC time constants. Enter values, get total capacitance instantly — free, no signup.
- Inductance CalculatorCalculate inductive reactance (XL) and energy stored in an inductor from inductance and frequency. Also computes resonant frequency for LC circuits.
- Decibel CalculatorCalculate decibels (dB) from voltage ratios, power ratios, or amplitude ratios — and convert dB values back to linear ratios. Covers dBV, dBm, and dBW standards.
- AWG Wire SizeLook up American Wire Gauge (AWG) specifications: diameter in mm, cross-section in mm², resistance per meter, and maximum ampacity for chassis and power wiring.