🚫 Office Closed (Holiday) 📅 We will reopen on Monday 🙏 Thanks for your patience 🚫 Office Closed (Holiday) 📅 We will reopen on Monday 🙏 Thanks for your patience

LED Series Resistor Calculator

Electronics Calculators

LED Series Resistor Calculator

Prototype Guru | Last updated on: May 15, 2026

Use this LED Series Resistor Calculator to quickly determine the correct resistor value required to safely operate LEDs in electronic circuits. This tool helps engineers, students, makers, and hobbyists calculate resistor values based on supply voltage, LED forward voltage, and desired current.

Supply Voltage (V_S)

Choose LED Color

Forward Voltage (V_F)

Forward Current (I_F)

Number of LEDs

Resistor Value

—

Power consumed by each LED —

Power consumed by all LEDs —

Power consumed by resistor —

End-to-end electronics prototyping and product development. Prototype Guru specializes in PCB design, embedded systems, IoT devices, and manufacturing support to turn ideas into market-ready products efficiently.