LED Series and Parallel Array Calculator
When you drive several LEDs from one supply you can wire them in series to share the voltage, in parallel to share the current, or in a grid of both. This calculator helps you design that array. Tell it your supply voltage, the forward voltage and current of a single LED, and how many LEDs you want, and it works out how many LEDs can safely sit in each series string, how many parallel strings you need, the current limiting resistor for each string, and the total current the whole array will draw. Putting LEDs in series is more efficient because one resistor serves the whole string, while parallel strings let you fit more LEDs than a single string of voltage would allow. Enter your numbers and get a ready to build layout in your browser.
How to use LED Series and Parallel Array Calculator
- Enter the supply voltage and the forward voltage and current of one LED.
- Enter how many LEDs you want to drive in total.
- Review the suggested LEDs per string and number of parallel strings.
- Read the per-string resistor value and the total array current.
- Verify your supply can deliver that total current before wiring.
Frequently asked questions
How does the calculator design a series and parallel LED array?
It divides your available supply voltage by the LED forward voltage to set how many LEDs fit per series string, then arranges the remaining LEDs into parallel strings each with its own resistor.
Why give each string its own resistor instead of one shared resistor?
A single resistor lets slight differences between strings cause uneven current sharing, so the tool assigns a per-string current-limiting resistor for balanced, safer operation.
What total current does it report?
It sums the current of every parallel string, giving the total draw your power supply must deliver for the whole array.
What is LED Series and Parallel Array Calculator?
When you drive several LEDs from one supply you can wire them in series to share the voltage, in parallel to share the current, or in a grid of both. This calculator helps you design that array.
Is LED Series and Parallel Array Calculator free to use?
Yes. LED Series and Parallel Array Calculator is completely free, with no sign-up and no usage limits.
Does LED Series and Parallel Array Calculator work in a web browser?
Yes. LED Series and Parallel Array Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with LED Series and Parallel Array Calculator?
Yes. LED Series and Parallel Array Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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