DIM Weight Calculator
Enter your parcel dimensions and weight to get the dimensional (volumetric) weight and the billable weight your carrier charges.
| · | Dimensional Weight | Billable Weight |
|---|
What is dimensional (DIM) weight?
Carriers charge parcels by whichever is greater — the actual weight or the dimensional weight — because a large, light box takes space a heavy small one does not. Dimensional weight is the box volume divided by a DIM divisor set by the carrier: DIM weight = (L × W × H) ÷ divisor. In inches and pounds the common divisor is 139; in centimetres and kilograms international air shipments use 5000 or 6000. The billable weight is the larger of the actual and dimensional weights, rounded up.
Common DIM Divisors by Carrier
| Carrier / service | Divisor | Units |
|---|---|---|
| UPS / FedEx (US retail) | 139 | in³ / lb |
| USPS (>1 cu ft) | 166 | in³ / lb |
| DHL Express | 139 | in³ / lb |
| IATA air standard | 6000 | cm³ / kg |
| Common courier (metric) | 5000 | cm³ / kg |
Frequently Asked Questions
How is dimensional weight calculated?
Multiply length × width × height to get the volume, then divide by the carrier's DIM divisor. For a 12 × 10 × 8 in box on divisor 139: 960 ÷ 139 = 6.9 lb dimensional weight.
What is billable weight?
The weight you are actually charged for: the greater of the actual weight and the dimensional weight, rounded up to the next pound or kilogram. If your box is light for its size, the dimensional weight usually governs.
Which DIM divisor should I use?
It depends on the carrier and contract. US domestic parcels from UPS and FedEx commonly use 139 (in³/lb); USPS uses 166 for packages over one cubic foot. International air freight typically uses 5000 or 6000 (cm³/kg). Always confirm the divisor in your carrier agreement.
Does the box have to be the outer size?
Yes. Always measure the outer dimensions of the packed carton, including any bulge, because that is the space the parcel occupies in the vehicle.
Is this the same as CBM?
No. DIM weight converts volume into a chargeable weight for parcel and courier shipments. CBM is the raw volume in cubic metres, used for ocean and air freight. Use the CBM calculator for container and LCL shipments.