CALCULATOR · ELECTRONICS

LED Resistor Calculator

Calculate the resistor value and power consumption needed to drive an LED.

HOW-TO How to Calculate LED Resistor Value +
  1. Enter the supply voltage, LED forward voltage, and forward current
  2. The required resistance, nearest E24 value, and power dissipation are displayed in real time

Result

Required Resistance
— Ω
Power Consumption
— W
E24 Safe Value (Ceiling)
— Ω
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Utility Electronics
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INPUTS
LED Resistor Calculator
3–48 V
Power presets:
V

3.0–48.0 V

1–4 V
LED color presets:
V

1.0–4.0 V (Red: 2.0 V / Green: 2.2 V / Blue: 3.2 V / White: 3.3 V / Ultraviolet: 3.4 V)

0.1–100 mA
mA

0.1–100 mA (typical LED: 20 mA)