Shipping Weight Calculator

Work out the dimensional weight carriers charge for, and whether your box is billed by size or by weight.

Billed weight

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Dimensional weight
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Billed by
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How this was calculated
Runs in your browser. Nothing you type is sent anywhere.
About the Shipping Weight Calculator
Shipping Weight Calculator works out the dimensional (volumetric) weight carriers use for light, bulky boxes, and whether your parcel is billed by its size or its actual weight.
Carriers charge whichever is larger, so a big box of light items can cost far more than its weight suggests.
How to use it
  1. Choose inches and pounds, or centimetres and kilograms.
  2. Enter the box's length, width and height.
  3. Enter the packed weight.
  4. Use your carrier's divisor: 139 for UPS and FedEx in inches is common.
Example
A 12 × 10 × 8 in box weighing 4 lb has a dimensional weight of 6.91 lb at a 139 divisor, so it's billed at 7 lb. A 40 × 30 × 20 cm box at 5,000 is 4.8 kg, billed at 5 kg.
Questions
What divisor should I use?
It depends on the carrier and your rates: 139 (UPS, FedEx daily rates) and 166 (USPS) in inches, 5,000 or 6,000 in centimetres. Check your carrier.
How do I lower the cost?
Use the smallest box that fits. Every inch of each side counts.
Why round up?
Most carriers bill in whole pounds or kilograms, rounded up.