Dimensional and Chargeable Weight Calculator

Measure a packed box

Use the outside length, width and height after packing, including the box and protective material. Enter the actual weight of one packed box, then the number of identical boxes. Do not enter a shipment’s combined weight as the weight of one box and multiply it again.

Choose cm, mm or inches for dimensions, and kg, g, lb or oz for actual weight. Different box sizes or weights belong on separate rows in Multiple box types. You can use 2 to 50 rows, with 1 to 10,000 identical boxes on each row. A name is optional and helps identify a box type in the result and CSV.

Set the service conditions

1. Volumetric divisor: choose 5,000, 6,000 or enter the divisor your service specifies. Every divisor in this tool is in cm³/kg. Selecting a number does not select a carrier or import its current contract.
2. Dimension rounding: keep the measured dimensions or round each side up to the next whole centimetre or inch. Use the rule stated for your service. Other dimension rules need to be applied to your measurements before using the keep-as-entered option.
3. Billing unit: choose kg or lb, then enter the increment used to round up the chargeable weight of each physical package. For example, 4.8 kg rounds to 5 kg with a 0.5 kg increment.
4. Minimum per package: enter a minimum in the selected billing unit, or 0 when none applies. The tool compares this minimum with actual and dimensional weight before rounding up.

Changing the billing unit resets its increment and minimum and clears the old rate per unit. A rate per kg is not a rate per lb. A shipment-wide fixed charge stays in place because it is independent of that weight unit.

How the calculation works

The tool converts lengths to cm and actual weights to kg. If selected, it rounds each dimension first. Dimensional weight in kg is length × width × height in cm divided by the cm³/kg divisor.

For each physical package, it takes the greatest of actual weight, dimensional weight and the entered minimum. It converts that comparison to the billing unit, rounds up to your increment and multiplies by the number of identical packages. It then adds the box types. It does not combine all actual weights and all dimensional weights before comparing them.

The per-box result identifies which weight set the basis. The summary also shows how much the rounded billable total exceeds actual weight. Displayed decimals can be rounded for readability; the billable-weight ceiling uses the value before display rounding.

A mixed-box example

These are made-up conditions to illustrate the calculation: divisor 5,000 cm³/kg, no dimension rounding, a 0.5 kg billing increment and no minimum weight.

The shipment has 9.3 kg actual weight, 12 kg dimensional weight and 14.5 kg billable weight under those conditions. Each smaller box uses actual weight as its basis, while each larger box uses dimensional weight. Adding the totals first would miss that distinction and the per-package rounding.

Inches and pounds: check the divisor’s units

Entering inches converts the measurements to cm before using the selected cm³/kg divisor. Choosing lb for billing converts the resulting comparison weight to pounds before applying your lb increment. The conversions use 1 inch = 2.54 cm, 1 lb = 0.45359237 kg and 1 ordinary mass ounce = 1/16 lb.

An inch-based divisor such as 139 in³/lb cannot be entered as 139 cm³/kg. The calculator does not automatically switch divisor systems when you change the dimension unit. A carrier’s published inch/pound formula can differ from converting its cm/kg formula; use this tool only when the cm³/kg basis matches your service.

Optional shipping-cost estimate in KRW

Enter a rate in South Korean won per selected billing unit and, if needed, one fixed charge for the whole shipment. The estimate is total billable weight × your entered rate + the fixed charge, rounded to a whole won. Leave the rate blank to calculate weight without a cost estimate.

For example, 14.5 kg at KRW 5,000 per kg plus a KRW 1,000 fixed charge gives KRW 73,500. These are example prices, not a carrier quote. Do not enter USD or another currency as though it were KRW. There is no exchange-rate conversion here.

Tiered rates, contract discounts, fuel and remote-area surcharges, duties, insurance and service eligibility are not fetched or added automatically. Confirm the amount with your carrier before paying or promising a delivery price.

Copy or save the full result

After calculating, copy the summary and per-box breakdown or download the UTF-8 CSV. The CSV includes box names, original units and dimensions, converted dimensions, actual and dimensional weights, quantities, billing rules and results. It is a calculation record, not a booking or a CSV import format.

Spreadsheet-formula protection can add an apostrophe to a box name that starts like a formula. Inputs and results are not uploaded or saved for your next visit. Keep a copy if you need it before leaving or reloading. The site’s separate favorites and recent-tools lists can remember the tool ID; see the privacy policy.

Limits and references

Dimensions accept up to four decimal places and actual weight up to six. Each dimension after rounding must be at most 10,000 cm; actual weight is limited to 1,000,000 kg per package. These are calculation limits, not permission to ship packages of that size. Invalid values are reported beside the relevant input rather than silently omitted from the total.

DHL UK’s weight and dimensions guide describes its cm-based divisor of 5,000 and comparing packages separately. FedEx China’s dimensional-weight FAQ describes rounding dimensions upward and distinguishes centimetre and inch divisor systems. These are examples of published service rules, checked on 2026-10-20, not a claim that every shipment follows the same contract.

For separate unit conversions, use the unit converter. Return to English tools or report a problem.