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ELECTRONICS

LED Resistor Calculator

Select a current-limiting resistor for an LED.

Transparent calculationFormula and assumptions shown
01

Enter your values

02

Your result

Resistance490Ω
FORMULA USEDR = (Vₛ − Vƒ) / I
METHOD

How this calculation works

The calculator substitutes your values into the stated engineering relationship and evaluates the result using the displayed units. Change any input to recalculate instantly.

Important

This is an idealised engineering calculation. Confirm material properties, loading conditions and applicable design factors before specification or construction.