Packaging & retail / Carton dimensioning
Carton dimensioning
Two jobs in one tool: convert internal dimensions to external (or back) using flute caliper, and see the dimensional weight so shipping cost surprises show up while the carton is still on the screen.
Inputs
Dimensions in inches, weight in pounds. Enter whichever dimensions you have and the tool converts to the other.
External dimensions (L x W x H)16.28 x 12.28 x 10.28 in
Cubic volume, external2,057 cu in (1.19 cu ft)
Length plus girth61.4 in
External dimension adds roughly two board calipers per axis. Carriers measure the outside of the carton, so always run dim weight on external dimensions, and round each dimension up to the next whole inch the way the carriers do.
Dimensional weight
Dim weight = (L x W x H, rounded up per axis) divided by the carrier's divisor. You are billed the greater of actual and dimensional weight.
| Carrier basis | Divisor | Dim weight (lb) | Billable (lb) |
|---|
Dim weight vs actualActual weight governs
Divisors move. As of July 12, 2026, the postal service joined the two major parcel carriers at a 139 divisor (applied to packages over 1 cubic foot), while retail and counter rates commonly still use 166. All the major carriers now round each dimension up to the next whole inch before applying the formula, which this tool does too. Confirm the current divisor in your carrier agreement before quoting freight, since negotiated contracts often carry a better one.