Dimensional Weight Calculator

DIM weight = length × width × height ÷ divisor. In inches and pounds with a 139 divisor, an 18 × 14 × 10 in box is 2,520 in³ ÷ 139 = 18.13 lb, which carriers round up to 19 lb. In centimeters with a 5000 divisor, a 40 × 30 × 20 cm box is 24,000 cm³ ÷ 5000 = 4.8 kg.

Billable (or chargeable) weight is the greater of the actual weight and the dimensional weight. A large, light box is billed on its size; a small, heavy box is billed on its weight.

It depends on the carrier, service and your contract. 139 in³/lb is common for US courier daily rates and 166 in³/lb for retail and postal rates; 5000 cm³/kg is common for express courier services and 6000 cm³/kg is the IATA standard for air cargo. Always check your carrier's current rules.

They are close but not identical. 139 in³/lb equals about 5,022 cm³/kg, so it gives a result about 0.4% lower than 5000, while 166 in³/lb is about 5,997 cm³/kg, almost the same as 6000.

Many carriers round each dimension to the nearest whole inch (or centimeter) and round the resulting weight up to the next whole pound, or to the next 0.5 kg for metric rates. Turn off rounding to see the exact values.

Use the smallest box that protects the item, avoid excess void fill, consider poly mailers for soft goods, and ask your carrier about a higher divisor in your contract, since a higher divisor lowers the DIM weight.

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