DigiKey's LED series resistor calculator uses supply voltage, forward voltage, and forward current values to help you identify the correct series resistor.

Our LED calculator will help you determine the value of the current limiting series resistor when driving a single or an array of low-current LEDs. To get started, input the required values and hit the …

This LED calculator will help you calculate the resistor values you will need when designing a series/parallel LED array circuit.

LEDs (Light Emitting Diodes) require current limiting resistors to prevent damage and ensure optimal performance. This calculator determines the exact resistor values needed for your specific LED …

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.

Calculate the best resistor for safe LED operation. Enter supply voltage, LED drop, and target current. Get power rating, nearest standard value, and checks instant.

Nov 19, 2025 · Find the right resistor for LEDs in series or parallel strings. Compute resistor value, power, total current, and see a simple wiring diagram. Share link and PNG export included.

LED resistor calculator: learn to choose the right resistor for any LED, understand forward voltage, measure Vf, and apply Ohm’s Law for series and parallel circuits.

LED Series Resistor Calculator Use this tool to calculate the resistance required to drive one or more series-connected LEDs from a voltage source at a specified current level.

Series LED Resistor Calculator: Compute resistor value, power dissipation, and voltage drop for LEDs in series. Enter source voltage, LED voltage, LED current, and LED count for precise results.