First digit
Second digit
Multiplier
Tolerance
Examples & guide

Resistor calculator

How to use

Decode 3–6 color bands, combine resistors in series or parallel, or calculate round-wire resistance.

Limits

Read the significant digits, multiplier, tolerance and optional temperature coefficient in order. A 3-band resistor has a nominal 20% tolerance. A uniform round conductor uses R = L/(σA). Check the part’s datasheet for special markings.

Examples & guide