LED Resistor Calculator

Free LED Resistor Calculator — calculate and compare options instantly. No signup required.

V
V
mA
1

Nearest Standard Resistor

510Ω

Actual LED current: 19.6 mA

Resistance Needed

500Ω (exact: 500.0Ω)

Power Dissipated

196.1 mW

How to Use the LED Resistor Calculator

  1. 1. Enter your values — fill in the input fields with your numbers.
  2. 2. Adjust settings — use the sliders and selectors to customize your calculation.
  3. 3. View results instantly — calculations update in real-time as you change inputs.
  4. 4. Compare scenarios — adjust values to see how changes affect your results.
  5. 5. Share or print — copy the link, share results, or print for your records.
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