Parallel and Series Led Resistor Calculator Single Led Series Resistor Calculation Supply Voltage (DC) (V) Working voltage of LED (V) Current drawn by the LED (ma) Calculated resistor value: (Ω) Calculated resistor power value: (W) Recommended resistor value: Recommended resistance power: (W) Multiple Led Series Resistor Calculation Supply Voltage (DC) (V) Working voltage of LED (V) Current drawn by the LED (ma) Number of LEDs Connected in Series Calculated resistor value: (Ω) Calculated resistor power value: (W) Recommended resistor value: Recommended resistance power: (W) Parallel Led Resistor Calculation Supply Voltage (DC) (V) Working voltage of LED (V) Current drawn by the LED (ma) Number of LEDs Connected in Series Calculated resistor value: (Ω) Calculated resistor power value: (W) Recommended resistor value: Recommended resistance power: (W)