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LED Resistor Calculator

Series resistor value and power rating for one LED or a string

LEDs

Supply voltage

V

LED colour

Typical values. The datasheet figure is always better.

Forward voltage

V

LED current

A

LEDs in series

Standard resistor series

Display

Decimal places

Exact Resistor

–

Standard Value

–

Actual Current

–

Resistor Power

–

Suggested Rating

–

Efficiency

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Diagram

All measurements

Measure	Value	How it is worked out