Output voltage · Local Calculator

LM317 Output Voltage Calculator

LM317 Output Voltage Calculator calculates output voltage from the supplied parameters, with live validation, a readable formula note, and local browser processing.

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How LM317 Output Voltage Calculator works

LM317 Output Voltage Calculator calculates output voltage from the supplied parameters, with live validation, a readable formula note, and local browser processing.

Calculation model

Uses the standard LM317 equation including adjustment-pin current.

Recommended workflow

  1. Confirm every field uses the displayed unit.
  2. Adjust the example values and review the live result and input summary.
  3. Copy the result, then document assumptions and verify requirements before use.

Use cases

Use it for planning, comparison, documentation, and quick checks involving r1, r2, adjustment current.

Limits and verification

The calculation follows this stated model: Uses the standard LM317 equation including adjustment-pin current. Real projects may require additional coefficients, tolerances, taxes, codes, or professional review.

Frequently Asked Questions

Does LM317 Output Voltage Calculator upload my values?
No. The calculation runs in the current browser tab and ToolHub does not receive or store the values you enter.
What does LM317 Output Voltage Calculator calculate?
Output voltage from r1, r2, adjustment current.
Can I use the result in a real project?
The calculation follows this stated model: Uses the standard LM317 equation including adjustment-pin current. Real projects may require additional coefficients, tolerances, taxes, codes, or professional review.
Does it work on phones?
Yes. The input and result workspace adapts to mobile, tablet, and desktop screens.
Why can my result differ from another source?
Differences usually come from units, rounding, assumptions, local rules, or coefficients used by the other source.

LM317 Output Voltage Calculator: inputs, output, and reproducible example

LM317 Output Voltage Calculator calculates output voltage from the supplied parameters, with live validation, a readable formula note, and local browser processing.

What this page actually processes

FieldControlDefault exampleValidation role
R1Number240R1 is read by the browser as a number value before the tool runs.
R2Number720R2 is read by the browser as a number value before the tool runs.
Adjustment currentNumber50Adjustment current is read by the browser as a number value before the tool runs.

Reproduce the built-in example

Start with R1 = 240; R2 = 720; Adjustment current = 50, then run LM317 Output Voltage Calculator. Change one input at a time so the effect on the result remains traceable.

After validating r1, r2, adjustment current, the page displays its result in the output workspace and enables the relevant copy or download action.

Formula and variable relationship

Uses the standard LM317 equation including adjustment-pin current. The implemented expression is “1.25*(1+r2/r1)+(iadj/1000000)*r2”. The page validates r1, r2, adjustment current before formatting the result in V.

Sensitivity check: change only r1 from 240 Ω to 264 Ω. With every other input unchanged, output voltage moves from 5.036 to 4.695 V. This provides a reproducible input-to-result check.

When to use it and how to interpret the result

LM317 Output Voltage Calculator is intended for workflows involving R1, R2, Adjustment current.

Limits and checks before use

Uses the standard LM317 equation including adjustment-pin current.

Page verification record

Controls inspected3 documented inputsResult pathValidate → process → review → copy/downloadLast content review2026-09-02