LED Resistor Calculator: Calculate Series Resistance and Power

This page covers an LED calculator and an LED resistor calculator. The LED resistor calculator is used to calculate the LED series resistor in an LED circuit.

This LED calculator takes source voltage, LED voltage, and LED current as inputs and produces LED resistor and LED power as output values.

Example of LED Calculator:

• INPUTS: Vs = 5 volts, Vled = 0.5 volts, Iled = 5 mA
• OUTPUTS: LED resistor (Rs) = 900 Ohm, LED Power = 0.0025 Watts

LED Resistor Calculator Equation or LED Calculator Formula

The following equation or formula is used for the LED resistor calculator.

The LED calculator takes inputs such as source voltage, voltage drop across the LED, and current through the LED and produces outputs as LED series resistor in Ohms and LED power in watts.