LED Resistor Calculator
Calculate current-limiting resistor value and power rating for LED circuits
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📊 Result Chart
About LED Resistor Calculator
LED Resistor Calculator is a free online tool. Calculate current-limiting resistor value and power rating for LED circuits. Works on mobile and desktop, all calculations run locally in your browser for privacy.
LED Resistor Calculator in 3 steps
- Enter the first parameter
- Enter the second parameter
- Click "Calculate" to see the result
Is this tool accurate?
Results are computed with standard, industry-accepted formulas for Supply Voltage and LED Forward Voltage calculations.
Do I need to download anything?
No, it runs entirely in your browser. No downloads needed.