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Ohm's Law Calculator
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Ohm's Law Formulas
V = I × R
Voltage
I = V / R
Current
R = V / I
Resistance
P = V × I
Power
P = I² × R
P = V² / R
P = V × I
Power variants
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Enter any two of V, I, R, P to solve for the rest. Full SI prefix support. Ohm's Law triangle diagram. Ideal for electronics students and engineers.
How to Use
- 1Enter any two known electrical values: voltage (V), current (I), resistance (R), or power (P)
- 2Select the appropriate unit prefix for each value (μA, mA, A for current; Ω, kΩ, MΩ for resistance, etc.)
- 3The calculator automatically solves for the remaining two unknowns
- 4All four values (V, I, R, P) are displayed in the results panel
- 5The Ohm's Law triangle diagram shows the three formula forms: V=IR, I=V/R, R=V/I
Features
- Solves for V, I, R, or P from any two inputs
- Full SI prefix support (μA, mA, A / mV, V, kV / Ω, kΩ, MΩ / mW, W, kW)
- Displays all four quantities (V, I, R, P) in results
- Ohm's Law triangle diagram (V=IR, I=V/R, R=V/I)
- Power formulas: P=VI, P=I²R, P=V²/R
- 100% browser-based
Frequently Asked Questions
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