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  2. Electrical & Electronics
  3. LED Resistor Calculator

LED Resistor Calculator

Current limiting specs solver.

Loading current limiting specs...

How to Use the LED Resistor Calculator

  • 1Enter source voltage.
  • 2Input forward voltage drop.
  • 3Input target current mA.

Calculation Formula & Mathematical Definition

R = (Vsource - Vforward) / Iforward.

Step-by-Step Worked Example

An LED at 20mA on 12V source with 2.1V forward drop needs a 495 Ohm resistor.

Frequently Asked Questions

How do I use the LED Resistor Calculator?

Enter your values into the input fields and the calculator will compute the result automatically and display it below.

Are the results from the LED Resistor Calculator accurate?

Yes, results are based on standard formulas. They are estimates only and should be verified with a qualified professional for official purposes.

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Estimate Only

Calculations on this website are automatic estimates and do not represent guaranteed financial, tax, or legal returns. Please verify details with certified specialists.