How do I use the Electricity Unit Converter?

Enter known values (voltage, current, resistance, or power). The Ohm's Law calculator automatically computes unknown values using V=IR and P=VI formulas. Convert between kilowatt-hours and other energy units for utility bill calculations.

Is the Electricity Unit Converter free?

Yes, the Electricity Unit Converter is completely free. It runs entirely in your browser with no signup, no download, and no data sent to any server.

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Electricity Unit Converter

Convert between electrical units and use Ohm's law calculator. Calculate volts, amps, watts, ohms, and kilowatt-hours with formula reference.

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Electricity calculator

Ohm's law and energy use

VoltsAmpsWattsOhmsHoursKilowatt-hours

Enter any two electrical values to solve the rest.

Solved pair

Power draw

Energy use

Voltage rule

Volts equal amps multiplied by ohms.

Power rule

Watts equal volts multiplied by amps.

Resistance rule

Ohms equal volts divided by amps.

Energy rule

Kilowatt-hours equal watts multiplied by hours divided by one thousand.

How to use

How to Use the Electricity Unit Converter

1 Enter known values (voltage, current, resistance, or power).
2 The Ohm's Law calculator automatically computes unknown values using V=IR and P=VI formulas.
3 Convert between kilowatt-hours and other energy units for utility bill calculations.

Ohm's Law (V = I × R) is the fundamental relationship between voltage, current, and resistance. Power (P = V × I) tells you how much energy a device uses per second.

Kilowatt-hours (kWh) measure energy consumption over time. A 100W bulb running for 10 hours uses 1 kWh. Average US electricity costs about $0.12-0.16 per kWh.

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