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This calculator will help you determine the value of the resistor to add in series with the LEDs to limit the current. Just input the indicated values and press the "Calculate" button. As a bonus, it will also calculate the power consumed by each LED.
Calculate the resistor to use in a circuit with an LED by entering the supply voltage, forward voltage, and forward current below. Optionally calculate the resistor to accommodate multiple LEDs connected in series.
This LED resistor calculator will help you to pick up a right value of resistor for the LED in your LED circuit, you just have to input the values of Source voltage (V s), LED forward current (I f) and Led forward voltage (V f).
Find the resistor value and power required to connect multiple LEDs with our LED Series Resistor calculator using supply and forward voltage.
LEDs are usually operated via a series resistor. The series resistor must be dimensioned in such a way that the supply voltage and the maximum permissible current are not exceeded. You can calculate the size of the resistor on this page.
Calculate resistor values for LEDs using this simple calculator. Enter any three known values and press Calculate to solve for the others.
The resistance needed for a resistor in a series LED circuit can be calculated using Ohm's law. The formula is: R = (Vs - (N × Vled)) / Iled. Where: R is the resistance required for the resistor. Vs is the supply voltage. N is the number of LEDs in series. Vled is the voltage drop across each LED.
