Enter the mass of the object and the cross-sectional area across the axis to determine the sectional density.

## Sectional Density Formula

The follow formula is used to calculate a sectional density.

SD = M / A

- Where SD is the sectional density
- M is the mass of the projectile
- A is the cross-sectional area

## Sectional Density Definition

A sectional density is defined as the ratio of an object, typically a projectile or bullet, and the cross-sectional area of the given axis. This is a mass per unit area while typical density is a mass per unit volume.

## Sectional Density Example

How to calculate a sectional density?

**First, determine the mass of the projectile.**Measure the mass of the projectile.

**Next, determine the cross-sectional area.**Measure the cross-sectional area of the projectile.

**Finally, calculate the sectional density.**Calculate the sectional density using the formula above.

## FAQ

**What is the sectional density of an M107 projectile.**

The sectional density of an M107 is .180 kg/cm^2.