# Inside dimensions

> Inside dimensions describe the space within an assembled package, rather than its external footprint.

Canonical: https://dielinemaker.com/glossary/inside-dimensions
Last updated: 2026-10-26

Geometry

## What it means in packaging

Product fit starts with this internal space. Allow for inserts, wraps, irregular shapes and the clearance needed for packing and removal. Nominal dimensions do not account for every closure projection or manufacturing tolerance.

## A practical example

A 90 mm wide product needs more than a nominal 90 mm cavity if an insert and packing clearance must also fit.

## What to check

Measure the product in its packed orientation and verify the assembled sample, including the tightest opening.

## Use it in your project

- [Inside, outside and manufacturing dimensions](https://dielinemaker.com/learn/box-size-calculator)
- [Box size calculator](https://dielinemaker.com/tools/box-size-calculator)

## Related terms

- [Outside dimensions](https://dielinemaker.com/glossary/outside-dimensions) — Outside dimensions describe the external envelope of an assembled package, including its material thickness.
- [Caliper](https://dielinemaker.com/glossary/caliper) — Caliper is the measured thickness of a sheet material, commonly expressed in millimetres or micrometres.
- [Crease](https://dielinemaker.com/glossary/crease) — A crease is a controlled deformation of board that guides a fold without cutting through the material.

## Related

- [Packaging glossary](https://dielinemaker.com/glossary)