LED Resistor Calculator

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Calculate the current-limiting resistor value and power dissipation for LEDs

Supply Voltage (V) Custom V_s (if custom) LED Forward Voltage (V) Forward Current (mA)

Required Resistor

R = 160 Ω

Power: 0.064 W

Resistor (Ω)

160

Nearest E12

180 Ω

Nearest E24

150 Ω

Power (W)

0.064

About: LEDs require a current-limiting resistor to prevent excess current. Use Ohm's law: R = (V_s - V_f) / I_f, where V_s is the supply voltage, V_f is the LED forward voltage, and I_f is the desired forward current. Typical LEDs run at 20 mA.