Resistors & LEDs

Resistor Color Code Calculator

Resistor Color Code Calculator. Resistor color codes and LED series-resistor calculations. Calculations run in your browser. Entered electrical values are not uploaded to our server.

Inputs

Band count

{{#each options}}Band 2

{{#each options}}Multiplier band

{{#each options}}Temperature coefficient band

Calculations run in your browser. Entered electrical values are not uploaded to our server.

ⓘMathematical estimate only. Verify equipment datasheets, manufacturer instructions, electrical codes and qualified design before real-world use.

Formula & method

Significant digits × multiplier; tolerance and temperature coefficient are read from their bands

Worked example

Brown · Black · Red · Gold = 1 kΩ ±5%

Assumptions & safety boundary

Mathematical estimate only. Verify equipment datasheets, manufacturer instructions, electrical codes and qualified design before real-world use.