LED Resistor Calculator
About LED Resistor Calculator
The LED Resistor Calculator helps you determine the correct series resistor value needed for your LED circuit. This tool ensures your LED operates safely within its specifications while protecting it from excessive current.
How to Use
- Enter your power supply voltage
- Select or enter your LED's forward voltage
- Use preset buttons for common LED colors
- Or enter a custom value from your LED's datasheet
- Choose the desired LED current
- Standard brightness: 20mA
- Low power operation: 10mA
- Or enter a custom value from your LED's specifications
- Click "Calculate Resistor" to see results
Features and Benefits
- Accurate resistor value calculation
- Power dissipation calculation
- Nearest standard resistor value suggestion
- Common LED presets for quick calculations
- Real-time updates
Technical Information
- LED Characteristics
- Red LED: ~2.0V forward voltage
- Green LED: ~2.1V forward voltage
- Blue/White LED: ~3.2V forward voltage
- Typical current: 20mA for full brightness
- Standard Resistor Values
- E12 series values used for suggestions
- Common tolerance: ±5%
- Recommended power rating included
Safety Considerations
- Always verify LED specifications from the datasheet
- Consider resistor power rating in your design
- Use a slightly higher resistance when in doubt
- Account for component tolerances
- Ensure proper heat dissipation