Resistor Calculator

Calculate resistor color codes

calculators.resistor.bandCount

calculators.resistor.band1 (calculators.resistor.firstDigit)

calculators.resistor.band2 (calculators.resistor.secondDigit)

calculators.resistor.band3 (calculators.resistor.multiplier)

calculators.resistor.band4 (calculators.resistor.tolerance)

Written by the EachTools Team

Last updated: January 2026

How Resistor Color Codes Work

Resistor color bands encode the resistance value, tolerance, and sometimes reliability. Each color represents a digit or multiplier.

Select the color for each band on the resistor.
View the resistance value in ohms, tolerance percentage, and the resistor's serial number.

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