Resistor Color Code Calculator

Choose resistor band colors to calculate the nominal resistance and tolerance range.

Bands

1st digit

2nd digit

3rd digit

Multiplier

Tolerance

—Decoded resistance

—Minimum

—Maximum

—Tolerance

—Nearest E12

Check a nominal value (Ω)

Tolerance (%)

—Value / tolerance range reference

Supports common 4-band and 5-band resistor color decoding. Special resistor markings and temperature-coefficient bands can use additional conventions.

How to use this Resistor Color Code Calculator

Decode common 4-band and 5-band resistor color codes into resistance and tolerance. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.