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Resistor Lookup Tables

Updated: Dec 7, 2021

I put together some resistor lookup tables for different combinations of LEDs and power supplies that I use myself when wiring up some lights. These can help you pick the right resistor to use in your wiring circuit and also calculate what size power supply you will need to power all of your LEDs. Since LEDs don't draw much power, you can usually ignore the size of the power supply unless you have a lot of lights. Even a couple of dozen LEDs can be powered for a long time with a pair of AA-size batteries.

Here is a PDF version of the worksheet you can download. The individual tables in the document are also in this post farther down.

Download PDF • 163KB

Here is a video showing how to use the resistor lookup tables.

Here are the individual tables from the PDF document for quick reference.

NOTE: Amazon affiliate links are listed in the description above. As an Amazon Associate, I earn from qualifying purchases.

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1 Comment

Jim Wilson
Jim Wilson
Sep 05, 2022

Hi Steve,

Thank you so much for all your hard work, it really is so useful.

I have passed it on to a couple of my elderly friends

who are somewhat unfamiliar with modern technology

and they both send their thanks.

Best Wishes

Jim W.

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