Resistor Color Code Calculator

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Determines the resistance and tolerance of a resistor based on its colored bands.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Band 1 Color, Band 2 Color, Band 3 Color (Multiplier), and Band 4 Color (Tolerance) in the units shown.

Step 2

Read Tolerance and Resistance in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Band 1 Color: Brown; Band 2 Color: Black; Band 3 Color (Multiplier): Red; Band 4 Color (Tolerance): Gold

Tolerance: 5 %; Resistance: 1,000 Ohms

Band 1 Color: Red; Band 2 Color: Red; Band 3 Color (Multiplier): Brown; Band 4 Color (Tolerance): Gold

Tolerance: 5 %; Resistance: 220 Ohms

Band 1 Color: Yellow; Band 2 Color: Violet; Band 3 Color (Multiplier): Orange; Band 4 Color (Tolerance): Gold

Tolerance: 5 %; Resistance: 47,000 Ohms

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