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`D = sqrt( "L" ^2 + "W" ^2 + "H" ^2)`

Enter a value for all fields

The **Diagonal of a Box** calculator computes the length of diagonal of a box based on the vertical height, width and the length.

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

- (
**H**) Height of Box - (
**W**) Width of Box - (
**L**) Length of Box

**Diagonal (D):** The calculator will return the length of the diagonal in inches. However, this can be automatically converted to other length units (e.g. centimeters, feet) via the pull-down menu.

The mathematical term for a box is a rectangular cuboid. The formula for the diagonal of a box is:

`D = sqrt(L^2 + W^2 + H^2)`

where:

- D = Diagonal of a box
- L = Length
- W = Width
- H = Height

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