Electronics
LED Resistor Calculator
Calculate the required resistor value for LED circuits
Calculator
LED Color (Quick Select)
Typical value: 20mA (10-30mA for some LEDs)
Results
Calculated Resistance: 150.0 Ω
Standard Resistor (E12): 150 Ω
Power Dissipation: 0.060 W
Recommended: Use a 150 Ω resistor rated for 1/4W (0.25W) or higher.
Formula
R = (Vs - Vled) / I
P = I² × R
R: Resistance (Ω), Vs: Source voltage (V), Vled: LED forward voltage (V), I: Current (A), P: Power (W)
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