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DIM Weight Calculator

Billable weight from box dimensions using the carrier's divisor.

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Rex says

Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.

Try a scenario

Click to load — tweak from there.

Inputs

Result

Billable weight (lb)

22

Dimensional weight (lb)

21.76

Pounds added by box size

12.76

Cubic inches

3,024

Estimated shipping cost

$29.70

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How to use this

  1. 1Enter length (in).
  2. 2Enter width (in).
  3. 3Enter height (in).
  4. 4Enter actual weight (lb).
  5. 5Enter dim divisor.
  6. 6Enter rate per billable pound ($).
  7. 7Read your billable weight (lb) on the right — it updates as you type.
  8. 8Hit Share to keep the scenario or send it to someone.

About this calculator

Carriers bill on whichever is greater: actual weight or dimensional weight. DIM weight is length × width × height divided by a divisor set by the carrier and service, so a light but bulky box costs far more than the scale suggests.

FormulaDIM weight = (L × W × H) ÷ divisor; billable = max(actual, DIM), rounded up.

Worked example

Using the values the calculator loads with:

Inputs

  • Length: 18 in
  • Width: 14 in
  • Height: 12 in
  • Actual weight: 9 lb
  • DIM divisor: 139 — standard retail (UPS/FedEx)
  • Rate per billable pound: 1.35 $

Results

  • Billable weight (lb): 22
  • Dimensional weight (lb): 21.76
  • Pounds added by box size: 12.76
  • Cubic inches: 3,024
  • Estimated shipping cost: $29.70

What each field means

Inputs

Length (in)
The length used in the calculation, measured in in. Starts at 18 in so you have a working example on load.
Width (in)
The width used in the calculation, measured in in. Starts at 14 in so you have a working example on load.
Height (in)
The height used in the calculation, measured in in. Starts at 12 in so you have a working example on load.
Actual weight (lb)
The actual weight used in the calculation, measured in lb. Starts at 9 lb so you have a working example on load.
DIM divisor
Pick the option that matches your situation — the maths changes per option. Choices: 139 — standard retail (UPS/FedEx), 166 — USPS / negotiated, 194 — some contract rates, 250 — international air freight.
Rate per billable pound ($)
The rate per billable pound used in the calculation, measured in $. Starts at 1.35 $ so you have a working example on load.

Results

Billable weight (lb)
Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Dimensional weight (lb)
Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Pounds added by box size
Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Cubic inches
Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Estimated shipping cost
Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.

FAQ

How do I lower DIM weight?

Shrink the box. Dropping each dimension by an inch on an 18×14×12 carton removes roughly 500 cubic inches, which is about 3.6 billable pounds at a 139 divisor.

Does DIM weight apply to every package?

For major US carriers it applies to essentially all ground and air packages. Flat-rate and cubic-priced services are the main exceptions.

Accuracy and limitations

  • Estimates assume standard, average conditions — local rules, pricing, and materials vary.
  • Results are rounded for readability; add a buffer before ordering, booking, or committing.
  • Double-check anything with a real cost attached against a local quote.

Cite this calculator

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APA
RevenueLab. (2026). Dimensional Weight Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/dimensional-weight
HTML
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/dimensional-weight" target="_blank" rel="noopener">Dimensional Weight Calculator — RevenueLab</a> (2026).</p>
Markdown
Source: [Dimensional Weight Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/dimensional-weight) (2026).
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