Calculate the correct resistor value for your LED circuit. Supports single LEDs and series configurations.
Typical: Red ~2V, Green ~2.2V, Blue/White ~3.2V
Standard LEDs: 20mA, High-power: 350mA+
Recommended Resistor
510 Ω
Calculated: 500.0 Ω
Power Rating
≥0.25 W
Power Dissipated
200.0 mW
Actual Current
19.6 mA
Resistor Voltage
10.00 V
LEDs require a current-limiting resistor to prevent them from drawing too much current and burning out. The formula is: R = (Vs - Vf) / If
Where Vs is supply voltage, Vf is LED forward voltage, and If is desired forward current.