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.
Vout
1.5986 V
Current
0.3401 mA
How to use the voltage divider
Enter input voltage and the two resistor values.
Formula & explanation
Vout = Vin × R2 / (R1 + R2). Current = Vin / (R1 + R2).
Examples
5 V, R1 = 10 kΩ, R2 = 4.7 kΩ → Vout ≈ 1.598 V.
Frequently asked questions
- Why does loading affect output?
- Drawing current through Vout adds a parallel resistance to R2, reducing the output. Use a buffer (op-amp) for high-impedance loads.
Related electrical & electronics tools
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.