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Electronics & IoT

LED Series Resistor Calculator

Calculate the exact resistor value and minimum wattage rating needed for LEDs based on supply voltage and forward voltage.

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Circuit Parameters

Specify source supply details, LED colors, and currents to size limiting resistors.

Source Voltage (V)
LED Forward Voltage (V)
LED Forward Current (mA)
LEDs in Series
Resistor Specifications

Recommended resistor values and power limits.

Vs = 5VR = 150 ΩLED (2V)Count: 1GND
Ideal Resistor Value150.0 Ω
Standard Resistor (E24)150 Ω
Power Dissipated0.06 W
Recommended Wattage≥ 1/4 W

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