💡 LED Resistor Calculator
Single LED, series, parallel, or reverse mode. Snaps to real E12/E24/E96 standard resistor values — always rounding up, never down, to keep your LED safe.
E12 / E24 / E96
Color bands
Single LED
5 V
2.0 V
Typical forward voltage varies by LED color/type. Check your LED's datasheet for an exact value.
20 mA
Standard indicator LEDs: 10-20mA. High-brightness: up to 30-50mA. Check your LED's max rating.
Nearest standard value (rounds UP only — never down, for LED safety)
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Circuit Diagram & LED Brightness
Resistor Color Bands
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Always verify against your LED's actual datasheet — forward voltage varies by manufacturer, color, and batch.