Use our free LED Series Dropping Resistor Calculator to quickly determine the ideal current-limiting resistor for your LED circuit. Prevent damage and ensure optimal performance for your LEDs by calculating the correct resistance value based on your supply voltage, LED forward voltage, and desired current.
Formula:
The formula to calculate the dropping resistor value (R) for an LED in series is:
R = (VS - VF) / I
- R: Resistor Value in Ohms (Ω)
- VS: Supply Voltage in Volts (V)
- VF: LED Forward Voltage in Volts (V)
- I: LED Forward Current in Amperes (A)