This calculator determines the optimal resistor value for LED strips based on LED density (lights/meter), input voltage (DC12V/24V), power consumption (W/m), and forward voltage (Vf) per LED. Use the interactive tool below, then read the guide to understand how it works.
İçindekiler
1. LED Resistor Calculator
LED Resistor Calculator
2. Step-by-Step Guide
Enter Parameters
LEDs/m: total LEDs per meter. Voltage: select DC12V or DC24V. Power: power consumption per meter. Vf: forward voltage (default 3.0V).
Click Calculate
The tool will automatically verify input validity, calculate circuit groups, determine current requirements, and compute resistor values.
3. Core Calculation Logic
1. Group Formation — 12V: 3 LEDs + 1 resistor per group; 24V: 6 LEDs + 1 or 2 resistors.
2. Current Calculation — Igroup = (Power / Voltage) / Groups
3. Resistor Voltage — Vresistor = Vinput − (LEDs per group × Vf)
4. Resistance Value — R = Vresistor / Igroup
4. 24V Configuration Options
| Configuration | Resistors | Calculation | Benefits |
|---|---|---|---|
| Standard | 1 resistor | R = Calculated value | Simpler layout |
| Alternative | 2 resistors | R each = R total / 2 | Better heat distribution |
5. Important Notes
⚠️ Actual Vf varies with current (±5% tolerance recommended).
⚠️ Always verify with physical measurements.
⚠️ Resistor power rating should exceed calculated value.
⚠️ For production solutions, contact our team at KayTai.
💡 Learn more about connecting LED strips Ve choosing the right power supply.
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