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Dimensional Weight Calculator

Calculate a parcel’s dimensional (DIM) weight from length × width × height ÷ a divisor (139 or 166 in³/lb), with imperial or metric units. Runs in your browser.

Common values:
Dimensional weight
12.43lb

Carriers use different DIM divisors and rounding. This is an educational estimate, not a carrier quote.

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A free dimensional weight (DIM weight) calculator that runs entirely in your browser. US carriers price many parcels on DIM weight so that a light but bulky box pays for the space it uses. The formula is length × width × height ÷ a divisor. Common US divisors are 139 and 166 in³/lb; the metric equivalents are 5000 and 6000 cm³/kg. Choose imperial or metric units, enter your box dimensions, pick a divisor, and read the dimensional weight instantly. This is an educational estimate. Carriers differ in the divisor, in rounding (DIM weight is often rounded up to the next whole pound), and in how they measure, so your carrier’s figure may differ. Nothing you enter is uploaded or stored.

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How to use this tool

  1. 01Choose your unitsPick imperial (inches and lb) or metric (cm and kg). The divisor presets update to match, 139 / 166 for imperial, 5000 / 6000 for metric.
  2. 02Enter the box dimensionsType the length, width, and height of the outer box. Carriers measure the package’s outside, so use the outer measurements.
  3. 03Pick a DIM divisor and read the resultChoose a common divisor or enter your carrier’s value. The dimensional weight appears instantly and can be copied.
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Examples

  • A 12 × 12 × 12 in box at 13912 × 12 × 12 = 1,728 in³. 1,728 ÷ 139 ≈ 12.43 lb dimensional weight.
  • The same box at 1661,728 ÷ 166 ≈ 10.41 lb. A larger divisor gives a lower DIM weight.
  • A metric boxA 40 × 30 × 20 cm box at 5000 cm³/kg: 24,000 ÷ 5000 = 4.8 kg.

  • How carriers use DIM weight

    Carriers compare the dimensional weight with the actual (scale) weight and charge for whichever is greater, the billable weight. Dense parcels are usually billed on actual weight; large, light parcels are billed on DIM weight. The chargeable weight calculator shows which one applies.

  • Sources and limitations

    This tool is an educational estimate and is not affiliated with any carrier. 139 and 166 in³/lb (and 5000 / 6000 cm³/kg) are common industry divisors, but each carrier and service sets its own divisor, rounding, and measurement rules, which can change. Check your carrier’s current documentation before relying on a figure.

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Frequently asked questions

What is dimensional weight (DIM weight)?

Dimensional weight prices a parcel by the space it occupies. It is length × width × height divided by a DIM divisor, and carriers bill the greater of DIM weight and actual weight.

What is the dimensional weight formula?

DIM weight = (length × width × height) ÷ divisor. In the US the divisor is usually 139 or 166 in³/lb; the metric equivalents are 5000 and 6000 cm³/kg.

What divisor should I use, 139 or 166?

Both are common and depend on the carrier and service. A larger divisor gives a lower DIM weight. Use the divisor in your carrier’s documentation.

Is dimensional weight the same as volumetric weight?

Yes, the same concept. "Dimensional (DIM) weight" is the US term and "volumetric weight" is common elsewhere. Pick the divisor and units your carrier uses.

Will this match my carrier’s charge exactly?

Not necessarily. It is an educational estimate. Carriers differ in divisor, rounding (often up to the next pound), and measurement, so verify with your carrier.

Is my data stored?

No. Everything runs in your browser. Nothing you enter is uploaded, saved, or shared.

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