Decode common four- and five-band resistor colors into nominal resistance and a tolerance range.
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Nominal resistance
1,000.0000 Ω
Read from the end opposite the spaced tolerance band. This decoder covers common four- and five-band resistors; it does not model temperature coefficients, zero-ohm jumpers or military reliability bands.
Read two significant-digit bands for a four-band resistor, or three for five bands.
Multiply the digits by the multiplier band’s power of ten.
Apply the final tolerance percentage around the nominal value.
Read two significant digits for four bands or three for five bands, multiply by the multiplier band and apply the tolerance percentage.
Brown, black, red and gold represent 10 × 100 = 1,000 Ω with ±5% tolerance, giving limits of 950–1,050 Ω.
Start opposite the spaced tolerance band. Unusual, damaged or ambiguous markings should be checked with the part documentation or a suitable measurement.
Last updated . Results are estimates for informational purposes only.