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Footprintz LED tools

LED Resistor Calculator

Calculate the series resistance, preferred E24 value, actual current, and safe resistor wattage for an LED circuit.

Calculated resistance
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Next E24 resistor
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Current with E24 resistor
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Resistor power dissipation
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Recommended power rating
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R = (supply voltage − total LED forward voltage) ÷ current. The recommendation uses the next higher E24 value and at least 2× the calculated dissipation. Verify LED datasheet values and resistor tolerance before building.