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`D = sqrt(l^2 + h^2 + d^2)`

Enter a value for all fields

The **Diagonal of a Box** calculator computes *Box aka Parallelepiped *the diagonal (**D**) of a box (a.k.a. rectangular parallelepiped) based on the length, height and depth (see diagram).

**INSTRUCTIONS:** Choose your preferred units and enter the following:

- (
**l**) This is the length of the box. - (
**h**) This is the height of the box. - (
**d**) This is the depth of the box.

**Diagonal**: The diagonal (**D**) is returned in meters. However, this can be automatically converted into many other length units (e.g. feet, centimeters) via the pull-down menu.

The formula for the diagonal of a box is:

` D = sqrt(l² + h² + d²)`

where:

- D is the length of the box diagonal
- l is the length of the box
- h is the height of the box
- d is the depth of the box

**Related Calculators:**

- For the Volume of a Box shaped object,CLICK HERE.
- For the Surface Area of a Box shaped object, CLICK HERE.
- Rolling Offset (Run)
- Rolling Offset (Travel)