Ohm's Law Calculator
Solve Ohm's law for voltage, current, or resistance from the other two.
Quick answer: enter your details below and click Calculate — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Pick the quantity to solve for.
- Enter the other two values.
- Click Calculate.
About this tool
Pick which quantity to find, then enter the other two. Ohm's law says voltage equals current times resistance, so the tool rearranges it as needed. It assumes an ohmic conductor at steady temperature.
Frequently asked questions
Does it work for all circuits?
It assumes an ohmic conductor; some components, like diodes, do not follow Ohm's law.
What if resistance is zero?
Current would be undefined in the formula, so the tool asks for a non-zero value.