Linear regulator calculator

Calculates properties of a linear regulator.

Example 1: Must calculate the resistance of R2 to have output of 12 volts when R1 value is 220 ohms and regulator is LM317View example
Example 2: Must calculate the output voltage of a 3% tolerance regulator when R1 value is 120 ohms and R2 value is 680 ohmsView example
Output voltagevolts
Resistor R1ohms
Resistor R2ohms
Reference voltagevolts
ADJ-currentamperes
Tolerance%
You may use one of the following SI prefix after a value: p=pico, n=nano, u=micro, m=milli, k=kilo, M=mega, G=giga
Fill in all values except the one you wish to calculate
  • Output voltage - Output voltage of the regulator circuit
  • Resistor R1 - Resistance of the resistor R1
  • Resistor R2 - Resistance of the resistor R2
  • Reference voltage - The internal reference voltage of the regulator
  • ADJ-current - The internal adjustment pin current of the regulator (typically 50uA)
  • Tolerance - The output voltage tolerance of the regulator