Enter the distance between the inside radius of the bend and the neutral bend line, and the sheet metal thickness to calculate the K Factor.

## K Factor Formula

The following formula is used to calculate the K Factor of a bend.

K = D / T

- Where K is the K factor
- D is the distance from the inside radius of a bend and the neutral bend line
- T is the thickness of the material

## K Factor Definition

**What is a k factor? **A k factor is a term used in manufacturing used to describe the ratio of the distance between the inner radius and the neutral bend line. This k factor is used to determine the length of a flat sheet that is required to make a bend of a specific radius.

## Example Problem

How to calculate a k factor?

**First, determine the distance between the inner radius and neutral bend line.**For this example, this distance is found to be 2.25″.

**Next, determine the thickness of the material.**In this material, the being used is 1.5″

**Finally, calculate the k factor.**Using the formula, the k factor is found to be 2.25/1.5 =

**1.5**

## About K Factor

**What is k factor and y factor? **K factors and Y Factors are both constants used in calculations of bending sheet metal of a certain thickness to a certain radius and angle.

**Can y factor be negative? **K factors range from 0 to 1 and will not be negative in absolute terms since neither the bend radius or thickness can be negative.