Shipping & logistics
Compare parcel chargeable weight or plan pallet/container freight volume with explicit mode assumptions.
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Dimensional weight calculator guide
Dimensional weight, also called DIM or volumetric weight, estimates what a large lightweight package costs to ship based on the space it occupies. The calculation multiplies the outside length, width, and height to find package volume, then divides that volume by a carrier divisor. The divisor is not universal: it depends on the carrier, service, route, and agreement, so use the value from the rate rule you are checking. The carrier presets on this page (standard 139, USPS 166, DHL Express, FedEx Ground, UPS air) are planning rules pending verification, and the custom option accepts any divisor. This calculator returns the chargeable-weight estimate; a carrier compares DIM weight with actual scale weight, applies rounding, may use minimum billable weights, and rates each package in a shipment separately. Measure the finished outside carton, including packaging. If you reduce empty space or choose a tighter box, the volume falls and the DIM weight can fall with it. Treat the result as a planning number and confirm the carrier’s current tariff before buying a label or quoting a customer.
Dimensional weight (lb) = length (in) × width (in) × height (in) ÷ carrier divisor. Chargeable weight = max(actual weight, dimensional weight), then apply the selected rounding rule (exact, up to the next whole pound, or up to the next half pound).
Worked example with the defaults: a carton measuring 40 in × 30 in × 25 in has 40 × 30 × 25 = 30,000 in³ of volume. With the standard-139 preset the dimensional weight is 30,000 ÷ 139 = 215.83 lb. The default actual weight is 0 lb, so chargeable weight is max(0, 215.83) = 215.83 lb, and because the standard preset uses exact rounding the calculator displays 215.83 lb. Switching to the USPS 166 preset gives 30,000 ÷ 166 = 180.72 lb, while the FedEx Ground preset keeps 139 but rounds up to 216 lb.
This calculator uses inches and a divisor that produces pounds. Do not enter centimeters with an inch-based divisor. If a carrier gives a metric rule, convert dimensions and use the divisor supplied for that metric service instead of reusing 139; a common metric equivalent is 5,000 cm³ per kg. Pallet and container modes convert the same dimensions to cubic meters using 61,023.74 in³ per m³.
Carriers bill on whichever is greater, actual weight or volumetric weight, so treat this result as the number to compare against your carrier's own quote. Divisors, rounding rules, and surcharges differ between carriers and between domestic and international services, and they change with contract terms. Confirm the current rules for your account before you price a shipment. On this page the figure rests entirely on length, width, height, actual weight, freight mode, shipping context, package quantity, container volume, carrier/service rule, custom divisor, rounding override, market / jurisdiction, effective date, data source, update owner and review date, so start there if the dimensional weight calculator returns something you did not expect.
Use outside packed dimensions, not the product dimensions, and measure the longest point of any bulge or flap. Leaving actual weight at zero means the page reports pure DIM weight, so enter the scale weight when you want the real chargeable comparison. Check whether the carrier rounds each dimension before multiplying, rounds the final DIM weight, or applies a minimum; the presets here only model final-weight rounding. The calculator cannot know account-specific divisors, oversize surcharges, or special handling charges.
Shipping results depend on carrier, service, route, divisor, rounding, surcharges, and contract terms. Confirm the current carrier rule before buying a label or quoting a customer.
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How it works
Compare parcel chargeable weight or plan pallet/container freight volume with explicit mode assumptions. This tool explains the calculation so you can adjust the assumptions to match your situation.
Worked example
With Length = 40 in · Width = 30 in · Height = 25 in · Actual weight = 0 lb · Freight mode = parcel · Shipping context = domestic → 215.83 lb (estimated parcel chargeable weight). Change an input above and this example updates with your numbers.
Common questions
Dimensional weight is a shipping estimate based on package volume rather than mass. It lets carriers price large, light boxes that take up more truck or aircraft space than their scale weight suggests, and it is compared with actual weight to find the billable figure.
Multiply the package length, width, and height in inches, then divide by the carrier’s dimensional divisor. With the default 40 × 30 × 25 in carton and divisor 139, the result is 30,000 ÷ 139 = 215.83 pounds.
Not always. Billable or chargeable weight is the greater of actual scale weight and dimensional weight, after the carrier applies its rounding and any minimum rule. A dense package is billed on scale weight; a light, bulky one is billed on DIM weight.
Use the divisor in the carrier or service rule you are pricing. UPS and FedEx retail rates commonly use 139 for inch measurements, USPS uses 166 for qualifying large parcels, and negotiated contracts may override a published default.
The quote may round dimensions, use a different divisor, apply minimums, price each package separately, or include fuel, residential, and oversize surcharges. Compare the rule details, not just the final number, and confirm the tariff in force on the ship date.