Converters · NUMORA
Resistor Color Calculator
Two digits × multiplier from the colour bands.
Open interactive calculatorHow to use
Tolerance band is not in the ohm value.
Formula
Ω = (10·a + b) × 10^c
FAQ
Is this Resistor Color calculator accurate?
The formula and assumptions are shown on the page, and the engine is covered by audit tests. Results are for reference — not financial or medical advice.
Do I need an account?
No. Calculations run in your browser. Recents can stay on this device.
What inputs do I need?
Tolerance band is not in the ohm value.
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