Inside or outside?
A finished box's outside dimensions include its walls and covering. Compare the item with the usable inside, after the insert is in place.
Free planning tool · No account
Will it fit inside the box?
Compare the overall size of an item with a box's usable inner space. Add a little room on every side, then check each possible orientation.
Check the dimensions
Review and paste it into your message only if you choose to share it. Nothing is sent automatically.
Can the item rotate?
The tool checks all six axis alignments. A listed alignment may still be unsuitable for a chain, a fragile setting, a shaped insert or the desired presentation.
What should I send?
Share the item's size, a photo, the preferred packaging and approximate quantity. Clarify units and whether a requested box size is internal or external.
Ask a packaging question →Frequently asked questions
How many millimeters are in an inch?
One international inch is exactly 25.4 mm. The unit selector converts the values already entered. Values are usually rounded to six decimal places; very small values use scientific notation. NIST length reference.
Does a fit result mean I can ship the item safely?
No. This tool compares rectangular measurements only. Test the complete packed order, including cushioning and closure, for your delivery conditions.
Is the calculation sent anywhere?
No. The calculation runs in this page in your browser. The tool does not submit your measurements or create an inquiry.