LED Resistor Calculator

Formula and Units

A series resistor limits LED current so the LED is not damaged.

Formula: resistor = (supply voltage - forward voltage) / current.

Understanding LED Series Resistors

1. What This Calculator Measures

LEDs need current limiting because too much current can damage them.

2. How the Calculation Works

The calculator subtracts LED forward voltage from supply voltage, then divides the remaining voltage by desired current.

3. Formula or Rule Used

R = (Vs - Vf) / I.

Explore Our Calculators

Math Calculators

Finance Calculators

Health Calculators

Science & Engineering Calculators

Unit Converters

Date & Time Calculators

Business & Tax Calculators

Other Calculators

Explore Programming Tools

Programming Tools

Explore our interactive programming environments for learning, testing, and executing code directly in your browser. Perfect for students, professionals, and enthusiasts.