Electrical & Electronics Tools

Practical calculators for circuits and electronics.

• Ohm's Law Calculator

  Solve 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 Amps

  Convert 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 Calculator

  Calculate 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 Calculator

  Calculate 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 Divider

  Calculate 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 Code

  Decode 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 Capacitance

  Calculate equivalent capacitance for capacitors in series and parallel, plus RC time constants. Enter values, get total capacitance instantly — free, no signup.

• Inductance Calculator

  Calculate inductive reactance (XL) and energy stored in an inductor from inductance and frequency. Also computes resonant frequency for LC circuits.

• Decibel Calculator

  Calculate 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 Size

  Look up American Wire Gauge (AWG) specifications: diameter in mm, cross-section in mm², resistance per meter, and maximum ampacity for chassis and power wiring.