Ohm's Law & Resistance

Ohm's Law Calculator

Ohm's Law Calculator. Ohm’s law and resistor-network calculations for common electronics work. Calculations run in your browser. Entered electrical values are not uploaded to our server.

Inputs

Voltage

Current

Resistance

Calculate

Calculations run in your browser. Entered electrical values are not uploaded to our server.

ⓘMathematical estimate only. Verify equipment datasheets, manufacturer instructions, electrical codes and qualified design before real-world use.

Formula & method

V = I × R; I = V / R; R = V / I; P = V × I

Worked example

12 V and 6 Ω → 2 A; 12 V and 2 A → 6 Ω

Assumptions & safety boundary

Mathematical estimate only. Verify equipment datasheets, manufacturer instructions, electrical codes and qualified design before real-world use.