DIM Weight Calculator — UPS, FedEx, DHL & Canada Post

Accurate billable weight with correct rounding rules. Fast, free, no signup.

Units
Package Dimensions
in
in
in
lb

How DIM Weight Works

1

Dimensional Weight

Carriers calculate a 'DIM weight' based on package size, not just actual weight.

2

DIM Divisors

UPS/FedEx use 139 (in³/lb). DHL uses 5000 (cm³/kg). Canada Post uses 5000 or 6000 depending on service.

3

Billable Weight

You pay for whichever is greater: actual weight or DIM weight.

Frequently Asked Questions

Dimensional weight (DIM weight) is a pricing technique used by carriers. It calculates a theoretical weight based on package volume, ensuring large but light packages are charged fairly.

Multiply Length × Width × Height, then divide by the carrier's DIM divisor (139 for UPS/FedEx in inches, 5000 for DHL in centimeters).

If your package is large relative to its weight, the DIM weight exceeds actual weight. Carriers charge the higher of the two.

This calculator uses standard 2025 rules for general guidance. Actual rates may vary by service, account, and destination. Always verify with official carrier tools.

Yes! UPS/FedEx round each dimension up to the next inch. DHL uses standard rounding to centimeters, then rounds billable weight to the nearest 0.5 kg.

Canada Post uses 'Volumetric Equivalent' (VE). Priority/Xpresspost/Expedited services use divisor 5000. Regular Parcel uses 6000. Weight is rounded up to nearest 0.5 kg with a 0.75 kg minimum tier for most services.

Embed Widget

Add this calculator to your website with a simple iframe.

<!-- DIM Weight Widget -->
<iframe
  src="https://dimcalc.com/embed?carrier=ups&units=imperial"
  width="360" height="520" loading="lazy" referrerpolicy="no-referrer"
  title="DIM Weight Calculator"></iframe>