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Ohm’s Law Calculator

Calculate current and dissipated power for an ideal ohmic resistor with positive resistance. This is a component model, not a wiring design.

Enter your values

V
Ω

Use a decimal point, without thousands separators.

Example result
Current
0.12 A
Power1.44 W

The initial result uses the example values. Enter your own values and calculate again.

Edit inputs

How it works

Calculate current and dissipated power for an ideal ohmic resistor with positive resistance. This is a component model, not a wiring design.

I = V/R; P = V²/R

Worked example

Show example inputs and result

Voltage: 12 · Resistance: 100.

Current
0.12 A
Power
1.44 W

Questions and answers

Why are some results rounded?

Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.

Are my inputs sent to a server?

The calculator processes inputs in your browser. Its code does not send your values to a server.

Method reviewed: October 8, 2026 · Methods & accuracy

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