LED Series Resistor
Calculate LED Series Resistor instantly with the exact formula and a worked example.
LED Series Resistor
Supply, V
LED U, V
I, mA
R
500Ω
More about: LED Series Resistor
What it calculates
The “LED Series Resistor” calculator computes R in Ω from 3 parameters: supply, v, led u, v, i, ma.
Used in design, material estimation, and structural calculations.
Example calculation
With parameters Supply, V = 12, LED U, V = 2, I, mA = 20 the result is 500 Ω.
How to use
- Enter supply, v, led u, v and i, ma — each field above is adjustable with a slider.
- R (Ω) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is LED Series Resistor calculated?
The LED Series Resistor calculator computes R (in Ω) from supply, v, led u, v, i, ma. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the LED Series Resistor calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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