⚡ Ohm’s Law Calculator
Calculator functions
Enter any two known values to calculate the remaining quantities:
- Voltage
- Current
- Resistance
- Electrical power
It supports all six possible input combinations, including voltage and current, voltage and resistance, current and power, and resistance and power.
Included features
- Automatic electrical unit conversion
- Millivolts, volts and kilovolts
- Microamps, milliamps, amps and kiloamps
- Milliohms, ohms, kiloohms and megaohms
- Milliwatts, watts, kilowatts and megawatts
- Detailed formula steps
- Animated current-flow circuit
- Quick circuit presets
- Formula reference section
- Copy-result button
- Fluorescent lime, cyan and pink themes
- Optional button sounds
- Mobile and desktop responsive layout
- No external libraries
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Ohm’s Law Calculator
Enter any two electrical values to calculate voltage, current, resistance and power.
Voltage
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Current
—
Resistance
—
Power
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Enter exactly two known values and press Calculate.
VoltageV = I × RV = P ÷ IV = √(P × R)
CurrentI = V ÷ RI = P ÷ VI = √(P ÷ R)
ResistanceR = V ÷ IR = V² ÷ PR = P ÷ I²
PowerP = V × IP = V² ÷ RP = I² × R
Educational use only. Disconnect power before working on real circuits and follow appropriate electrical safety procedures.