Free online calculator

Resistor color code calculator (4, 5 and 6 bands)

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Resistor

Example 100 Ω ± 5%

Or enter a value to get the colors (4 bands):

Inductor

Example 100 µH ± 5%

Or enter a value to get the colors (4 bands):

Capacitor

Three-digit code like "104": two significant digits then a multiplier, in picofarads — but a third digit of 8 or 9 means ×0.01 and ×0.1, not zeros. A trailing letter is the tolerance (J = ±5%, K = ±10%, M = ±20%), and European markings put the unit where the decimal point goes: 4n7 = 4.7 nF.