This led resistor reference table shows the resistor value for a range of supply voltage values, assuming a led forward voltage of 2 V and a led current of 20 mA. Every figure is computed with the same engine that powers our LED Resistor Calculator, so the numbers are exact.
| Supply voltage | Resistor value | Resistor power dissipated |
|---|---|---|
| 2.3 V | 15.0 | 0.0060 |
| 4.5 V | 125.0 | 0.0500 |
| 6.8 V | 240.0 | 0.0960 |
| 9 V | 350.0 | 0.1400 |
| 14 V | 600.0 | 0.2400 |
| 18 V | 800.0 | 0.3200 |
| 27 V | 1,250.0 | 0.5000 |
| 45 V | 2,150.0 | 0.8600 |
| 63 V | 3,050.0 | 1.2200 |
| 90 V | 4,400.0 | 1.7600 |
How to use this table
Find the row closest to your supply voltage and read across to the resistor value. For a value between two rows, the real figure sits between them — or enter your exact numbers in the LED Resistor Calculator for a precise answer.
Need a value that is not in the table? — the LED Resistor Calculator does it instantly, for free, with the formula and a worked example built in.
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