Dimensional Weight Calculator

Check one packed parcel

1. Choose centimetres with kilograms, or inches with pounds. Enter the parcel's outside length, width and height, including bulges, and supply a divisor with the matching units. Switching profiles restores separate drafts; it does not convert measurements.
2. Choose whether to use dimensions as entered or round each edge upward to a whole unit. Actual packed weight is optional. To round the chosen weight upward, enable a custom increment in kg or lb. Use plain numbers without thousands separators; a dot or comma can mark decimals.
3. Calculate and check the dimensional value, comparison basis if actual weight was supplied, and any upward rounding. Copy keeps the assumptions with the answer. Editing a field or switching a profile removes the old result.

Size, scale weight and two different rounding stages

Dimensional weight is the used length multiplied by width and height, divided by your divisor. It expresses occupied space as a weight under that rule; it does not measure the parcel's physical mass. Actual packed weight is what a scale measures, including the packaging.

A divisor has units. Centimetres cubed per kilogram produce kg; cubic inches per pound produce lb. Numbers such as 5000 and 139 belong to their own settings and are not interchangeable. This calculator does not select a factor or determine which service instructions apply.

Rounding each dimension happens before multiplication. Final weight rounding happens after the exact comparison, when available, and moves upward to a multiple of your increment. For example, an increment of 0.5 means multiples of half a kilogram or half a pound, not rounding to one decimal place.

The calculator compares exact values before shortening the display. An approximately shown dimensional weight can look equal to actual weight while being slightly different. Calculation details preserve an exact fraction; positive values below the display limit are shown as less than that limit, not zero.

Illustrative checks, not shipping tariffs

With dimensions 40 by 30 by 20 cm and an illustrative divisor of 5000 cm³/kg, dimensional weight is 4.8 kg. If actual weight is 3 kg and your chosen upward increment is 1 kg, the rounded comparison is 5 kg. These settings do not establish a carrier's price or rules.

Dimensions of 10.01 cm on all three edges give 0.2006006002 kg at a divisor of 5000. Rounding each edge upward first uses 11 by 11 by 11 cm and gives 0.2662 kg. Against actual weight of 0.25 kg, the winning basis changes; a final 0.125 kg increment then gives 0.375 kg.

At 0.01 by 10 by 50.01 cm with divisor 5000, dimensional weight is exactly 0.0010002 kg. Its shortened display is approximately 0.001 kg, but rounding the exact value upward to a 0.001 kg increment gives 0.002 kg. Rounding the displayed number would lose that difference.

What this answer does not decide

Only one rectangular bounding box is calculated. There is no quantity, shipment aggregation, unit conversion or irregular-solid volume model. Rounded package weights cannot safely be replaced with one rounded combined volume.

Service, geography, rate type, contract, actual carrier measurements, minimum weights, packaging and other rating rules can change a bill. The available dimension and common-increment options do not reproduce every carrier method. Confirm current instructions with your provider; no shipping price or certified billable weight is supplied.

Dimensions accept up to two decimal places and 1000 selected units; optional actual weight accepts up to three decimal places and 1000000. The divisor is an integer from 1 to 1000000; a rounding increment is 0.001 to 1000. These are application limits, not package eligibility rules. A blank actual weight yields only a dimensional result.

Your parcel figures stay in this page's calculation

The calculation runs in your browser. Parcel inputs and results are not uploaded, saved in local storage or put into a shareable URL. Switching profiles keeps drafts only while the tool remains open. Copy writes a summary only when you request it; Clear removes both profiles and their results.