Calculadoras

Resistor Color Code Calculator

Decode resistor color bands (3, 4, 5, 6-band) to resistance value — or enter a value to find the bands. Includes tolerance and temperature coefficient.

Number of bands:

D1

D2

×10ⁿ

±%

Digit = 1
Digit = 0
× 100
±5%

Resistance

1

±5% → 950 Ω1.05

Color reference

ColorDigitMultiplierToleranceppm/°C
Black
0×1250
Brown
1×10±1%100
Red
2×100±2%50
Orange
3×1,00015
Yellow
4×10,00025
Green
5×100,000±0.5%20
Blue
6×1,000,000±0.25%10
Violet
7×10,000,000±0.1%5
Gray
8×100,000,000±0.05%1
White
9×1,000,000,000
Gold
×0.1±5%
Silver
×0.01±10%
None
±20%

How to read a resistor

Hold the resistor with the tolerance band (usually gold or silver, and often wider or separated) on the right. Read colors from left to right. For 4-band: first two bands are digits, third is multiplier, fourth is tolerance. For 5/6-band: first three are digits, then multiplier, tolerance, and optional ppm/°C (temperature coefficient).

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Resistor Color Code Calculator — Free Online Tool | FreeTool24 | FreeTool24