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Ohm's Law Calculator

Calculate voltage, current, or resistance using V=IR. Enter any two values. Free, accurate, no sign-up.

๐Ÿ“– Read the complete Ohm's Law Calculator guide โ†’

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๐Ÿ”’ All calculations happen in your browser. No data is sent to any server. No sign-up required.
Enter any 2 values โ€” the third will be calculated
Result

Formula

V = I ร— R | I = V รท R | R = V รท I

Example

220V, 5A โ†’ R = 44 ohms | 12V, 100ฮฉ โ†’ I = 0.12A

Frequently Asked Questions

Who was Georg Ohm?

German physicist who discovered the V-I-R relationship in 1827.

What is resistance?

Opposition to current flow. Conductors have low resistance; insulators have high resistance.

Does Ohms Law apply everywhere?

Only to ohmic materials. Semiconductors and diodes are non-ohmic.

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