LM317 calculator

Enter the desired output voltage and approximate resistor divider current, and the calculator finds the optimum values for R1 and R2.

LM317 calculator

Vout

V (between 1.25V and 37V)

Series

E12 - 10% E24 - 5% E48 - 2% E96 - 1%

I_R1

ca. 1 mA ca. 2 mA ca. 5 mA ca. 10 mA ca. 20 mA don't care

R1

R2

These resistor values result in the following actual values for output voltage and R1 current:

Vout

Error

I_R1

Disclaimer: this calculator comes without guarantee. Use at your own risk. If you would find errors, please let me know, and include the parameters used and the results you got.