LED Resistor Calculator

Calculate a series resistor for LED current limiting and estimate resistor dissipation.

15 V supply, 2 LED(s) in series =

540 ohm

Representative value from the LED Resistor Calculator reference table.

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LED Resistor Calculator

Determine safe series resistor values for LED strings.

Calculated Resistor

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Reference Table

Use this complete table for quick lookup and internal linking to specific value pages.

LED Resistor Calculator Reference
LED String	Resistor	Power in Resistor (W)
5 V supply, 1 LED(s) in series	145 ohm	0.058
5 V supply, 2 LED(s) in series	40 ohm	0.016
9 V supply, 1 LED(s) in series	345 ohm	0.138
9 V supply, 2 LED(s) in series	240 ohm	0.096
9 V supply, 3 LED(s) in series	135 ohm	0.054
9 V supply, 4 LED(s) in series	30 ohm	0.012
12 V supply, 1 LED(s) in series	495 ohm	0.198
12 V supply, 2 LED(s) in series	390 ohm	0.156
12 V supply, 3 LED(s) in series	285 ohm	0.114
12 V supply, 4 LED(s) in series	180 ohm	0.072
15 V supply, 1 LED(s) in series	645 ohm	0.258
15 V supply, 2 LED(s) in series	540 ohm	0.216
15 V supply, 3 LED(s) in series	435 ohm	0.174
15 V supply, 4 LED(s) in series	330 ohm	0.132
24 V supply, 1 LED(s) in series	1,095 ohm	0.438
24 V supply, 2 LED(s) in series	990 ohm	0.396
24 V supply, 3 LED(s) in series	885 ohm	0.354
24 V supply, 4 LED(s) in series	780 ohm	0.312
48 V supply, 1 LED(s) in series	2,295 ohm	0.918
48 V supply, 2 LED(s) in series	2,190 ohm	0.876
48 V supply, 3 LED(s) in series	2,085 ohm	0.834
48 V supply, 4 LED(s) in series	1,980 ohm	0.792

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