## What is bend allowance

**Bend allowance** is a fundamental parameter to calculate sheet elongation. This is defined as the **length of the neutral fibre** from the beginning to the end of the arc generated by the bend.

## How to calculate bend allowance, K factor and Y coefficient in one click

To** calculate the bend allowance, the K factor** and the derived coefficient called the Y factor, insert the thickness and initial length of the sheet into the cells on the left. After bending the sheet, insert the inner radius, and flanges A and B. Bending angle is 90°.

Thickness T [mm]:
Flat length L [mm]:
Internal radius R [mm]:
Side A [mm]:
Side B [mm]: