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LM317 Calculator

Find the output voltage of an LM317 regulator.

Calculated Output

Output voltage (V) 5

Formula: Vout = 1.25 * (1 + R2 / R1)

Step-by-Step Breakdown

1. Values used:

2. R1 = 240 ohm

3. R2 = 720 ohm

5. Output voltage = 5V

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The math behind it

Vout = 1.25 x (1 + R2/R1). The 1.25 V is the regulator's reference voltage.

R1 240, R2 720 gives 5 V.

What is R1 usually?

240 ohms is the typical recommended value.