Ohm's Law & Resistance

Series Resistor Calculator

Series Resistor 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

Resistor values

Separate multiple values with semicolons, for example 100; 220; 1k.

Default resistance unit

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

Rtotal = R1 + R2 + … + Rn

Worked example

100 Ω + 220 Ω = 320 Ω

Assumptions & safety boundary

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