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.
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.
Yes. LED Series and Parallel Array Calculator is completely free, with no sign-up and no usage limits.
Yes. LED Series and Parallel Array Calculator runs in any modern web browser. There is nothing to download or install.
Yes. LED Series and Parallel Array Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.