Ohm's Law Calculator
Enter any two of voltage, current, resistance or power — get the other two using V=IR and P=VI.
- Runs in your browser
- No upload on server
- Free, forever
- Enter values
- See result
- Copy or share
Fill in any two — the other two solve automatically. Leave blanks empty.
V = — I = — R = — P = —
Uses V = I·R and P = V·I.
How this works — and why it's private
- Type any two known values.
- The remaining values calculate instantly.
- Copy the full result for your notes.
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