Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

First band

Required string input.

Second band

Required string input.

Third band

Required string input.

Decode a three-band resistor color code into resistance in ohms. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Resistance (Ω)

The resulting resistance returned as a number.

• Resistor value, power, noise, and color-code calculations must account for tolerance, temperature coefficient, voltage coefficient, pulse rating, working voltage, package thermal resistance, ambient temperature, and mounting. Required steady-state power should include the manufacturer's derating curve.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• SMD Resistor Code

  Decode a three-digit SMD resistor code into resistance in ohms.

• Capacitor Color Code

  Decode a three-band capacitor color code into capacitance in nanofarads.

• Inductor Color Code

  Decode a three-band inductor color code into inductance in microhenries.