⚡ Ohm's Law Calculator

Enter any two of V, I, R — the remaining value and power are auto-computed

Formula

V = I × R · P = V × I

Voltage V

V (volt)

Current I

A (ampere)

Resistance R

Ω (ohm)

Enter exactly two of V, I, R

Notes

① Enter any two of V, I, R — the third is computed automatically

② Power P is computed from V and I (P = V × I)

③ DC circuits only. For AC use impedance Z instead