LED Resistor Calculator
Calculation formula
Resistor value:
R = (Vsupply − Vf) / ILED
Where:
R = (Vsupply − Vf) / ILED
Where:
- R = Resistor value (Ohms, Ω)
- Vsupply = Supply voltage (Volts, V)
- Vf = LED forward voltage (Volts, V)
- ILED = Desired LED current (Amps, A)
Note: For current in mA, divide by 1000 (e.g., 20 mA = 0.02 A)