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Science & Engineering

LED Resistor Calculator.

Electrical values, markings and results remain in this browser. Calculate series resistor and power rating from supply, forward voltage and current. Uses explicit SI units, local arithmetic and independent verification.

Use LED Resistor Calculator

Private in this browser. Electrical inputs and results stay in this browser.

Tool options
Preparing the local tool…

How it works

  1. 01

    Enter component values in the named units.

  2. 02

    Run the transparent local calculation.

  3. 03

    Review topology, tolerance and safety limitations before use.

Frequently asked questions

Does this approve an electrical design as safe?

No. It performs ideal educational arithmetic from user-supplied values.

Does LED Resistor Calculator upload my data?

LED Resistor Calculator runs locally in your browser. Electrical inputs and results stay in this browser.

What output does LED Resistor Calculator create?

LED Resistor Calculator creates Json output after the result passes its local verification checks.

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