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Ohm’s law calculator

Find voltage, current, resistance and power from any two quantities.

Get started

  1. Enter exactly two positive quantities and choose their units. Clear any other numeric fields.

Example

Input

12 V and 6 Ω

Expected result

2 A, 24 W

Try it

Good to know

The calculation runs in your browser. Use consistent units in fields with no explicit unit.

Calculation method

For a resistive circuit, V = IR and P = VI. Inputs convert to SI units first. This calculator uses 746 W per hp and displays results in V, A, Ω and W.

V=IR,P=IVV=IR,\qquad P=IV