LED Resistor
Supply voltage, LED forward voltage, current in milliamps, and how many LEDs are in series. Resistance, nearest E12 and E24 values, and resistor watts.
Frequently asked questions
Is this electrical advice?
No. This is not electrical advice. It is ideal arithmetic from the numbers you type. Check the LED datasheet before you build anything.
What if the nearest resistor is lower?
A lower value lets a little more current through. If the LED is near its limit, use the next higher value instead.