# Arc Length Calculator

- Canonical URL: https://www.ahner-industrial.com/arc-length-calc
- Page type: webpage
- Updated: 2026-08-07

Calculate arc length from diameter and included angle, with practical guidance for fabrication planning.

## Inputs and formula

Enter a diameter greater than zero and an included angle greater than zero and no more than 360 degrees.

`Arc length = pi x diameter x included angle / 360`

The calculator also returns radius, full circumference, and the percentage of the full circle represented by the arc.

## Planning note

Reference values only. Verify final manufacturing values against approved drawings, actual material properties, and applicable codes.

[Open all fabrication reference tools](https://www.ahner-industrial.com/ref-info)
[Use an arc calculation in a forming review](https://www.ahner-industrial.com/contact?project=Forming#quote-form)

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