Dimensional Weight Calculator

How it is calculated

The tool works in centimetres and kilograms. It first computes the volume, volume = length × width × height in cm³, then dimensional weight = volume ÷ divisor in kg. The divisor is the carrier's cm³-per-kg figure; if you leave it blank or enter zero or less, the tool uses 5000. When you also enter the actual weight, billable weight = max(actual weight, dimensional weight), meaning the larger of the two. Without an actual weight, the billable figure simply equals the dimensional weight. Results are shown to two decimals. The tool does not round up to the carrier's weight steps, add surcharges or convert inches and pounds, so a divisor meant for inches and pounds (such as 139) cannot be used here. Use the divisor your own carrier quotes for centimetres.

Common mistakes

• Entering inches or pounds. The tool expects centimetres and kilograms; convert first (1 inch = 2.54 cm, 1 lb = 0.4536 kg).
• Using the wrong divisor. Different carriers and services use different values, and 6000 instead of 5000 changes the result by a sixth.
• Measuring the product instead of the packed carton. Carriers use the outside dimensions of the box including padding.
• Leaving the actual weight blank and treating the result as the billable weight. Without it, the tool shows only the volume-based figure, which may be lower than the real scale weight.
• Expecting the carrier to charge exactly this number. Carriers often round up and add their own rules, which the tool does not apply.