Dimensional weight and shipping calculator
Carriers charge for the space a parcel takes up as well as its weight. Enter the box size and weight to see the dimensional weight, which one you’ll be billed for with UPS, FedEx, USPS, DHL and others, and what to charge customers to cover it.
Your parcel
Divisors differ by carrier, service and account. Check yours in your carrier’s rate guide; these are the common published ones (checked 6 October 2026).
Billed weight
You’ll be charged for
Dimensional weight
What to charge for shipping
Charge at least to cover it.
Selling on Etsy? Etsy takes its 6.5% transaction fee and payment processing on shipping too; the Etsy fee calculator includes it.
Runs in your browser. Nothing you enter is sent anywhere.
How it works
- The box’s length × width × height is divided by the carrier’s divisor (for example 139 for inches and pounds, 5000 for centimetres and kilograms).
- You’re billed for whichever is higher: that dimensional weight or the actual weight. Measurements and weight are rounded up, as most carriers do.
- Add the carrier’s price, packing and any fee on shipping to see the least you should charge.
What you enter stays on your device
This tool runs entirely in your browser. Nothing you type is sent to our servers, so there is nothing for us to store, see or delete.
To check, open your browser’s developer tools, switch to the Network tab and use the tool: you will not see what you type being sent anywhere.
Related tools
Questions
What is dimensional weight?
A weight worked out from a parcel’s size, so large, light boxes cost more to send. Carriers charge the higher of it and the actual weight.
Did USPS change its divisor?
Yes. From 12 July 2026, USPS uses 139 instead of 166 for Priority Mail Express, Priority Mail, Ground Advantage and Parcel Select parcels over 1 cubic foot, and rounds each measurement up to a whole inch.
Is what I enter saved or sent anywhere?
No. The calculator runs in your browser and nothing you type is sent to our servers.