LED Resistor Calculator

LED Resistor Calculator

LED Resistor Calculator

LED Resistor Calculator Introduction

1. Principle

The LED Resistor Calculator helps determine the appropriate current-limiting resistor value for LED circuits. The calculation formula:

R = (Vsupply - Vf × N) / If
  • Vsupply: Supply voltage
  • Vf: LED forward voltage
  • N: Number of series LEDs
  • If: Forward current (A)

2. Calculation Process

  1. Input voltage, forward voltage, current, and LED count
  2. Automatic resistor value calculation
  3. Power consumption estimation

3. Applicable Scope

  • Single or multiple series LED circuits
  • Various LED types and colors
  • Precision brightness control applications

4. Example

Scenario: 12V supply, 3 red LEDs (2V, 20mA each)

Total Voltage: 2V × 3 = 6V
Resistor: (12V - 6V) / 0.02A = 300Ω

5. Important Notes

  • Verify input parameters accuracy
  • Use resistors with adequate power rating
  • Consider LED color-specific voltages
  • Implement current protection measures
Vs R GND

Circuit Diagram: Series LED Configuration

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