Resistor Color Code Calculator
Use this resistor color code calculator to read a resistor value from its colour bands. Enter band colours and tolerance information and review resistance, multiplier and tolerance.
Resistance value
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Tolerance range —
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How it works
Value = (band1 × 10 + band2) × 10^(band3 multiplier); tolerance from band 4How to use the Resistor Color Code Calculator
Start by entering band colours and tolerance information. Keep the units consistent and check that each value belongs to the same question.
The result gives resistance, multiplier and tolerance. Some resistors use different band layouts, so check the component type. Use it as a guide and check any instructions, rules or professional advice that apply.
Frequently Asked Questions
What does this resistor color code calculator calculate?
It gives resistance, multiplier and tolerance. Some resistors use different band layouts, so check the component type.
What information should I enter?
Enter band colours and tolerance information. Use the same units throughout so the result is easier to understand.
What does the tolerance band mean?
It shows the possible variation around the nominal resistance.