LED Resistor Calculator
Professional tool for hobbyists and engineers to design reliable LED circuits. No account required.
settings_input_component Circuit Parameters
Professional Recommendation
For standard indicator LEDs, running at 15mA instead of the 20mA maximum significantly increases lifespan and reduces power consumption without a noticeable drop in brightness.
Recommended Resistance
150Ω
Closest common component available in most kits.
Minimum rating: 1/8W (0.125W) or higher.
Visual Identification Guide
Calculation Formula
R = (Vs - Vf×n) / If
R = (5.0V - 2.0V×1) / 0.020A = 150Ω
Ohm's Law Based
Industry standard calculations ensuring safety and reliability for all your projects.
Standard Color Codes
Instantly identify the resistors you need in your inventory with visual 4-band color matching.
Power Ratings
Safety first. We provide minimum wattage recommendations to prevent component overheating.