Electronics helper

Resistor calculator

Pick a common resistor type, choose each band color, and see the resistance update instantly. A built-in guide shows which ring is the first one.

Resistor type

How to find the first ring

Look for the tolerance band. It is usually spaced a little farther away from the others. Read the resistor from the opposite end. In this calculator, band 1 is always marked for you.

Resistance

0 Ω

Band order

Start at the band marked 1. The last band is the tolerance band.