What is dimensional weight?
Dimensional weight is a shipping weight based on package volume. Carriers compare it with actual scale weight and usually charge whichever weight is higher.
Free Dimensional Weight Calculator
A dimensional weight calculator estimates shipping weight from package volume and carrier divisor, then compares it with actual scale weight. Use it to find billable weight before you buy labels or choose packaging.
Built for ecommerce sellers comparing cartons, mailers, and fulfillment packaging before a product ships.
Package inputs
Inputs assume inches and pounds. For metric parcels, convert dimensions consistently or use your carrier's metric divisor.
Weight and cost result
Carriers generally bill the higher rounded weight.
Volume
2520 cubic in
DIM weight
18.13 lb
Rounded billable
19 lb
Estimated label cost
$28.15
Shipping insight
DIM weight is 6.13 lb above actual weight before rounding. A smaller package may reduce the billable weight.
Package right-sizing comparison
Right-sized carton
15 x 12 x 8 in - 12 lb billable
$18.70
Compact mailer
13 x 10 x 6 in - 12 lb billable
$18.70
Current package
18 x 14 x 10 in - 19 lb billable
$28.15
Dimensional weight FAQ
How do I calculate DIM weight?
Multiply length by width by height, then divide by the carrier divisor. For many domestic parcels, common divisors include 139 and 166, but your account or carrier may use a different number.
What is billable weight?
Billable weight is the weight a carrier uses for pricing. It is commonly the greater of rounded actual weight and rounded dimensional weight.
Why does package size change shipping cost?
Large lightweight boxes take up truck and aircraft space. DIM pricing charges for that space, so reducing empty space can lower billable weight and label cost.
Is this an official carrier rate quote?
No. This calculator estimates billable weight and planning cost from your assumptions. Confirm final label prices with your carrier, shipping software, or marketplace account.
Related seller tools
Pair billable weight with shipping, marketplace, and profit calculators before choosing a package.
Shipping Cost Estimator
Compare estimated USPS, UPS, and FedEx package rates.
eBay Shipping Calculator
Estimate seller profit after label and marketplace fees.
Amazon FBA Fee Calculator
Estimate fulfillment fees by size tier and weight.
Profit Margin Calculator
Check whether shipping cost still leaves enough margin.