What it does
LEDCalculator.net uses supply voltage, LED forward voltage, rated current and LED count to plan a current-limited LED array.
LEDCalculator.net takes DC supply voltage, LED forward voltage, rated forward current in mA and LED count, then offers wiring-diagram or schematic output. Use the LED manufacturer's voltage/current rather than treating its colour table and suggested 20 mA as specifications for every LED. The form distinguishes supply voltage from each LED's drop and includes a source-voltage warning. Print and direct-URL sharing controls let users retain or pass on a proposed design. The privacy policy, effective March 2019, describes usage/cookie data and purpose-based retention without a fixed duration; it does not state a separate lifetime for shared designs.
Strengths
- LED-array calculation with wiring and schematic output
- Inputs distinguish supply voltage from LED forward voltage
Watch out for
- The documented workflow expects a DC supply
Best for
- Planning current limiting for a specified LED array
Sources
- LED Calculator - Current limiting resistor calculator for LED arrays (Oct 26, 2026)
- LED Array Calculator (Oct 26, 2026)
- LED Calculator Privacy Policy (Oct 26, 2026)