Dimensional Weight Calculator
Dimensional weight converts package volume into a pricing weight. Enter package dimensions, actual weight, and the divisor from your carrier rate sheet; the billable weight is generally the greater applicable weight.
How to calculate dimensional weight
Multiply length by width by height, then divide the package volume by the DIM divisor. Keep dimensions and the divisor in the same unit system.
For a 16 × 12 × 10 inch box using 139, the result is 13.81 lb before the carrier's rounding rule. If the scale weight is 8 lb, dimensional weight is higher and will usually determine the billable weight.
Actual weight versus dimensional weight
Actual weight comes from a scale. Dimensional weight represents the space a parcel occupies. Carriers compare the applicable values because a light, oversized carton can consume more transport capacity than a compact parcel of the same scale weight.
Choosing the correct divisor
Use the divisor shown in your current service guide, quote, or customer agreement. For context, 139 and 166 are common imperial divisors, while 5000 and 6000 are common metric factors. They are not interchangeable unless the dimensions and resulting weight use the matching units.
Frequently asked questions
What is dimensional weight?
Dimensional weight is a pricing weight calculated from package volume and a carrier divisor.
Which weight is billed?
Carriers generally use the greater applicable weight, often actual or dimensional weight, subject to service rules and rounding.
Should I round the result?
Follow the carrier’s measurement and rounding instructions. Many services round dimensions or final weight, but the exact rule varies.