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Enter package dimensions and actual weight to calculate DIM weight and billable weight for major carriers.
Dimensional weight (also called DIM weight or volumetric weight) is a pricing technique used by carriers to account for the space a package occupies relative to its actual weight. If a package is large but light, the carrier charges based on its size rather than its weight.
Formula (imperial)
DIM Weight = (Length × Width × Height) / DIM Divisor
| Carrier | Divisor (in³) | Divisor (cm³) |
|---|---|---|
| FedEx | 139 | 5,000 |
| UPS | 139 | 5,000 |
| USPS | 166 | 6,000 |
| Freight / LTL | 250 (varies) | — |
Carriers compare the actual weight of your package against the dimensional weight and charge you for whichever is greater. This is called the billable weight.
Billable weight
Billable Weight = MAX(Actual Weight, DIM Weight)
Loumia compares rates across FedEx, UPS, USPS, and regional carriers in real time — factoring in DIM weight automatically. Pick the cheapest option per order, every time.
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