Dimensional Weight Calculator
Determine your package's billable shipping weight. Couriers charge based on volume or actual weight—whichever is greater.
Mathematical Overview
The DIM Formula
The calculation is straightforward: determine the total cubic volume of the package, and divide it by the carrier's mathematical constant (the Divisor).
Common Carrier Divisors
- • FedEx & UPS (Daily/Business Rates): 139 (Inches/Lbs)
- • FedEx & UPS (Retail Rates): 166 (Inches/Lbs)
- • USPS: 166 (Inches/Lbs) for packages over 1 cubic foot.
- • DHL / International Metric: 5000 (CM/Kg) is standard.
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Frequently Asked Questions
What is Dimensional (DIM) Weight?
Dimensional weight is a pricing technique used by commercial freight transport companies and postal services. It calculates the theoretical weight of a package based on its volume (Length × Width × Height) rather than its actual physical weight.
What is 'Billable Weight'?
Couriers will charge you based on either the actual weight of the package or its dimensional weight—whichever is greater. The higher of the two numbers becomes your 'Billable Weight'.
What is a DIM Divisor?
The DIM Divisor is a mathematical constant set by couriers to convert cubic volume into weight. In the US (inches/pounds), the standard divisor is typically 139 for daily rates or 166 for retail rates. In metric (cm/kg), the standard divisor is usually 5000 or 6000 depending on the carrier.
Why do shipping companies use DIM weight?
Shipping a large box filled with bubble wrap and a single feather takes up significant space on an airplane or delivery truck, even though it weighs almost nothing. DIM pricing ensures couriers are compensated for the cargo space a package occupies, not just how heavy it is.