Dimensional Weight Calculator
Calculate dimensional weight from package length, width, height, and the carrier divisor. The calculator compares that result with actual scale weight so you can identify the estimated billable weight.
A practical package-checking workflow
- Pack the item first and measure the outside length, width, and height at the points required by the carrier.
- Select inches and pounds or centimeters and kilograms so the dimensions, actual weight, and divisor use one system.
- Choose the divisor from the current service guide, quote, or account agreement.
- Enter the finished package dimensions and scale weight, then calculate.
- Compare actual, DIM, and estimated billable weight before entering your own rate.
Read the three weight results
Actual weight is measured on a scale. DIM weight is calculated from package volume. Billable weight is generally the greater applicable weight after the carrier applies its measurement, rounding, minimum, and service rules.
Which DIM divisor should you use?
Use the divisor shown in your current carrier service guide, quote, or customer agreement. Common examples include 139 and 166 for imperial calculations and 5000 and 6000 for metric calculations, but no single divisor applies to every shipment.
See the full dimensional-weight formula guide and the 139 versus 166 comparison for more detail.
Decide whether a different box could help
If DIM weight is higher than scale weight, package volume is driving the estimate. Test a smaller carton only when the item, cushioning, and carrier packaging requirements still fit. Recalculate with the same divisor and compare the new estimated billable weight. The box suggestion is a starting point for that check, not proof that the item will fit or that the carrier will charge the displayed amount.
Use the metric volumetric-weight guide for centimeter/kilogram examples, or the formula guide for the arithmetic and rounding sequence.
Carrier dimensional-weight calculators
Check the source-specific guidance for UPS, DHL, FedEx, or USPS before relying on an estimate.
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.