MagicKit.ai

LED Resistor Calculator

Calculate the correct resistor value for LED circuits. Find resistance, power rating, and optimal values for your LED project.

How to Calculate LED Resistor Values

  1. 1 Enter your power supply voltage
  2. 2 Select the LED color or enter custom forward voltage
  3. 3 Set the desired LED current in milliamps
  4. 4 Choose the LED configuration (single, series, or parallel)
  5. 5 View the calculated resistance and nearest standard values
  6. 6 Note the power rating and resistor color code

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Last updated: January 15, 2026 · v2.1