◆ CIRCUITS & CHIPS, DECODED FOR THE AI ERA 10 FREE CALCULATORS NO LOGIN · NO ADS · NO TRACKING BUILT FOR EE STUDENTS WORLDWIDE v0.2 LIVE
◆ CIRCUITS & CHIPS, DECODED FOR THE AI ERA 10 FREE CALCULATORS NO LOGIN · NO ADS · NO TRACKING BUILT FOR EE STUDENTS WORLDWIDE v0.2 LIVE
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/ tool 04 — analog

LED current limiter calculator

Pick supply voltage, LED forward voltage (or a color preset), and desired current. Get the exact resistor plus the nearest standard part.

Vsupply R = 220Ω LED
Quick pick — LED forward voltage (Vf)
enter values above

Typical LED forward voltages

Forward voltage (Vf) varies by LED color and brand. Always check the datasheet, but typical values:

Most 5mm indicator LEDs run happily at 10–20 mA. High-brightness LEDs may go to 30 mA or more.