Quick Answer: Volumetric weight is length × width × height in centimeters divided by 6,000 for air cargo (IATA) or 5,000 for courier shipments like FedEx, UPS and DHL Express. Carriers bill the higher of actual and volumetric weight. One cubic meter of air cargo equals 167 kg of billed weight.
- Air cargo (IATA): cm³ ÷ 6,000 = kg, or in³ ÷ 166 = lb. One cubic meter bills as 167 kg.
- Courier and express: cm³ ÷ 5,000 = kg, or in³ ÷ 139 = lb, calculated per box, not per shipment.
- Chargeable weight is always the higher of actual and volumetric weight — air cargo rounds up to the next 0.5 kg.
- Since August 18, 2025, FedEx and UPS round every dimension up to the next whole inch and the weight up to the next whole pound.
The volumetric weight calculator on this page runs all three modes at once — air cargo, courier and ocean LCL — from the same box list. It also tells you whether your pieces fit a passenger aircraft's lower deck or need a freighter.
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Go to the calculator →Reference prices: air cargo from Miami
| Destination | Air cargo | Transit |
|---|---|---|
| El SalvadorSal | $799 | 1 days |
| HondurasSap | $852 | 1 days |
| GuatemalaGua | $658 | 1 days |
| Dominican RepublicSdq | $742 | 1 days |
| ColombiaBog | $579 | 1 days |
| PanamaPty | $675 | 1 days |
| PeruLim | $728 | 1 days |
| EcuadorUio | $612 | 1 days |
Port-to-port rates in USD from Mia, calculated with our quoting system (current since September 28, 2026). Air cargo: 100 kg (0.6 m³). They include freight and US export charges; they do not include import taxes or local charges at destination. The calculator on this page gives your exact price, with pickup and delivery.
How do I calculate volumetric weight?
Quick Answer: Multiply length × width × height in centimeters, then divide by 6,000 for air cargo or 5,000 for courier. A 60 × 40 × 40 cm box is 96,000 cm³. Divided by 6,000 that is 16 kg of air volumetric weight; divided by 5,000 it is 19.2 kg for courier.
The math takes ten seconds. The discipline is in measuring the carton correctly.
Worked air cargo example
Take one carton measuring 60 × 40 × 40 cm with an actual weight of 11 kg.
- Multiply the three sides: 60 × 40 × 40 = 96,000 cm³.
- Divide by the IATA divisor: 96,000 ÷ 6,000 = 16 kg volumetric.
- Compare against actual weight: 16 kg beats 11 kg.
- Round up to the next 0.5 kg: the air waybill bills 16.0 kg.
Worked courier example
The same carton in inches measures 23.62 × 15.75 × 15.75 in. FedEx and UPS round each side up to the next whole inch first.
That gives 24 × 16 × 16 = 6,144 in³. Divided by the courier divisor of 139, that is 44.2 lb. The label prints 45 lb after rounding up to the next whole pound.
Note the gap. The same box bills 16 kg (35.3 lb) on an air waybill and 45 lb on a courier label.
Pro Tip
Measure the outer carton at its widest points. That means bulges in the corrugated, strapping, handles, protruding edges and pallet feet. Carrier dimensioning scanners read the bounding box, not the nominal carton size printed on the spec sheet. A 2 cm bulge on a 60 cm side adds real billed weight.
Enter each box once with its quantity in the calculator on this page. It returns billed weight for air, courier and ocean at the same time. The divisor, not the scale, decides what most shippers actually pay.
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Go to the calculator →What is volumetric weight and why do carriers charge it?
Quick Answer: Volumetric weight, also called dimensional weight, is the space a shipment occupies converted into a weight figure. Aircraft and delivery vans run out of room long before they run out of payload, so carriers price light, bulky cargo by volume. That protects the value of every cubic meter sold.
In one line: volumetric weight is the billed weight equivalent of the space your boxes take up.
A Boeing 777 freighter has a payload limit and a volume limit. Load it with pillows and it fills up at a fraction of its payload. The carrier would fly a near-empty revenue load. The DIM factor fixes that.
DIM factor is the divisor a carrier applies to convert cubic inches or centimeters into billed weight.
Cargo lighter than 167 kg per cubic meter pays for space on air cargo, not for mass. Above that density, the scale wins and you pay actual weight.
Which cargo bills on volume
- Pillows, cushions, bedding and textiles in retail packaging
- Lampshades, plastic housings and empty enclosures
- Foam packaging, insulation and injection-molded parts
- Assembled furniture and bulky e-commerce returns
Which cargo bills on actual weight
- Steel fittings, fasteners and machined parts
- Printed books, paper stock and catalogs
- Machine spares, bearings and dense industrial components
- Liquids in drums, resins and chemical concentrates
Do I divide by 5000 or 6000 to work out volumetric weight?
Quick Answer: Divide by 6,000 for air cargo booked with a freight forwarder under IATA rules, and by 5,000 for express courier shipments with FedEx, UPS or DHL Express. In inches, the equivalents are 166 for air cargo and 139 for courier. The lower the divisor, the higher the billed weight.
The divisor is a commercial term, not a law. It lives in your carrier contract or tariff. Confirm it before you commit to a rate.
Divisor by mode and carrier
See the data
| Mode / carrier | cm³ per kg | in³ per lb | kg per m³ |
|---|---|---|---|
| Air cargo (IATA, air waybill) | 6,000 | 166 | 167 |
| FedEx Express International | 5,000 | 139 | 200 |
| UPS Worldwide Express | 5,000 | 139 | 200 |
| DHL Express Worldwide | 5,000 | 139 | 200 |
Source: IATA TACT dimensional weight rules and published carrier service guides · January 2026
Air cargo at 6,000
The classic 1:6 ratio printed on every air waybill. A consolidator buys space from the airline on this basis and rebills you the same way. It is the friendliest divisor for bulky cargo, which is why a forwarder-booked air shipment often beats courier on anything over 70 kg chargeable.
Courier at 5,000
Express networks move through vans, belt sorters and aircraft containers where space is scarcer. At 5,000, the same carton bills about 20% heavier than on an air waybill. You trade that premium for door-to-door delivery, customs clearance included and tracking to the doorstep.
US trucking does not use a divisor: LTL carriers price a pallet by its freight class, which comes from its density in pounds per cubic foot. The freight class calculator works it out.
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Go to the calculator →What is the difference between chargeable weight and actual weight?
Quick Answer: Actual weight is what the scale reads. Volumetric weight is the space converted into kilos. Chargeable weight is whichever of the two is higher, and it is the only number that sets your freight bill. Air cargo compares them across the whole shipment; courier compares them box by box.
| Weight type | Definition | How it is measured | Who sets it |
|---|---|---|---|
| Actual (gross) weight | Mass of cargo plus packaging, pallet and dunnage | Platform scale at the origin terminal or courier hub | Carrier at acceptance |
| Volumetric (DIM) weight | Space occupied, converted using the carrier divisor | Tape measure or laser dimensioning scanner | Carrier tariff / contract |
| Chargeable weight | The higher of actual and volumetric weight | Automatic comparison in the rating system | Carrier rating engine |
Air cargo totals first, then compares
Ship 10 cartons of 60 × 40 × 40 cm weighing 11 kg each. Total volumetric is 10 × 16 = 160 kg. Total actual is 110 kg. The air waybill bills 160 kg chargeable.
Mix in two dense crates and the picture flips. The totals are compared once, across the whole shipment, which can rescue a bulky consignment.
Courier compares box by box
Courier networks rate each package on its own air waybill line. One oversized box in a shipment of ten still bills on its own dimensional weight. Dense boxes never subsidize light ones.
The rounding trap most shippers miss
Air cargo chargeable weight rounds up to the next 0.5 kg. FedEx and UPS round up to the next whole pound, after rounding every dimension up to the next whole inch. On a 20-piece courier shipment, rounding alone can add 15-25 lb of billed weight that never appears in your own spreadsheet.
How do FedEx and UPS round DIM weight in 2026?
Quick Answer: Since August 18, 2025, FedEx and UPS round every package dimension up to the next whole inch before multiplying, then round the resulting weight up to the next whole pound. A 23.2-inch side becomes 24 inches. On a three-sided box, that rounding alone can add several pounds of billed weight.
Run the math on a real carton. You measure 23.2 × 15.4 × 15.4 in.
- Your calculation: 23.2 × 15.4 × 15.4 = 5,502 in³ ÷ 139 = 39.6 lb
- Carrier calculation: 24 × 16 × 16 = 6,144 in³ ÷ 139 = 44.2 lb, billed as 45 lb
- Difference on one box: more than 5 lb of unplanned billed weight
Multiply that by 40 boxes a week and the variance becomes a budget problem.
2026 size thresholds to watch
| Threshold | Trigger | What happens |
|---|---|---|
| Additional handling | Over 10,368 in³ (6 ft³) | Surcharge applied per package |
| Large package | Over 17,280 in³ (10 ft³) or 110 lb | Large package surcharge, minimum billable weight applies |
| Maximum weight | 150 lb | Package refused on standard service |
| Maximum length | 108 in | Package refused on standard service |
| Maximum length + girth | 165 in (girth = 2 × width + 2 × height) | Package refused on standard service |
Your tape measure is not the final word
Every FedEx and UPS hub runs laser dimensioning scanners on the conveyor. The scanner reads the bounding box in milliseconds and the rating engine rebills the shipment days later. Photograph each box next to a tape measure before pickup. That photo is your evidence if you dispute a re-measurement.
For lane-specific courier pricing to Central America and the Southern Cone, see our Courier Calculator Honduras: Instant Rates (2026) and Courier Calculator Chile: Instant Rates, 3-8 Days (2026).
How many kilograms is one cubic meter of air freight?
Quick Answer: One cubic meter of air cargo bills as 167 kg under the IATA 6,000 divisor, because 1,000,000 cm³ ÷ 6,000 = 166.67 kg. Under the courier divisor of 5,000, the same cubic meter bills as 200 kg. Anything lighter than that density pays for space.
Calculate your shipment's density first: total kilos ÷ total cubic meters. Above 167 kg/m³, air freight pricing works in your favor. Below it, you are buying space.
Break-even density by divisor
- Air cargo, 6,000 divisor: 167 kg/m³
- Express courier, 5,000 divisor: 200 kg/m³
A 3.5 m³ shipment of auto parts weighing 820 kg has a density of 234 kg/m³. It bills on actual weight on an air waybill. A 3.5 m³ shipment of patio cushions weighing 95 kg bills on 584 kg volumetric.
Unit conversions you will need
- 1 inch = 2.54 cm
- 1 kg = 2.2046 lb
- 1 ft³ = 0.0283 m³
- 1 m³ = 35.3 ft³
For 1-3 day lane examples with live rates, see our Air Freight Calculator El Salvador: 1-3 Day Rates 2026 and Air Freight Calculator Ecuador 2026: Instant Quotes.
How is volume charged on ocean LCL and trucking?
Quick Answer: Ocean LCL bills on W/M — weight or measure — the higher of cubic meters and metric tonnes, where one tonne equals one cubic meter, usually with a one cubic meter minimum. US trucking (LTL) prices by freight class, set by density in pounds per cubic foot. Both reward dense, stackable cargo.
Two LCL examples
- 4.2 m³ weighing 2.6 tonnes → bills as 4.2 W/M (volume wins)
- 1.8 m³ weighing 3.1 tonnes → bills as 3.1 W/M (weight wins)
Minimum billing on most USA and Canada LCL exports is 1 m³ or 1,000 kg, whichever is greater. That applies on Miami→Cartagena, Houston→Puerto Cortés, New York→Caucedo and Vancouver→Callao alike.
From about 13-15 m³, a 20' FCL is usually cheaper per cubic meter than LCL. Run both numbers before you book a half-container of LCL.
Ocean LCL (W/M)
Your CFS measures the cargo on arrival, after palletizing. Overhang and pallet height count. A non-stackable pallet is billed on the full slot height it blocks. Deconsolidation at destination adds DTHC and handling per W/M, not per piece.
US trucking (LTL freight class)
LTL carriers price a pallet by its freight class, set by density: weight in pounds ÷ cubic feet, pallet included. The lighter the pallet for its size, the higher the class. The freight class calculator works it out in 3D. A pallet marked non-stackable can be charged for the space above it.
| Mode | How volume is charged | Minimum charge | Rounding rule |
|---|---|---|---|
| Air cargo (IATA) | cm³ ÷ 6,000, shipment total | Carrier minimum per AWB | Up to next 0.5 kg |
| Express courier | cm³ ÷ 5,000, per package | 1 lb / 0.5 kg per package | Up to next whole inch and pound |
| Ocean LCL | W/M: higher of m³ and tonnes | 1 m³ or 1,000 kg | Typically to 2 decimals of m³ |
| US trucking (LTL) | Freight class, from density in lb/ft³ | Carrier minimum charge | NMFC density tiers |
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Go to the calculator →How do pallets, ULDs and multi-piece shipments change the math?
Quick Answer: Palletized air cargo is measured over the pallet base, the wrap and any overhang, then divided by 6,000 — the pallet and dunnage weight count too. Aircraft height limits decide whether your pallet flies in a passenger belly, on a freighter main deck, or not at all.
Aircraft height limits that decide your routing
| Position | Base dimensions | Max build height | What fits |
|---|---|---|---|
| Passenger lower deck (belly) | 96 × 125 in (244 × 318 cm) | ~163 cm | Standard palletized freight |
| Freighter main deck (PMC) | 96 × 125 in (244 × 318 cm) | ~244 cm | Tall machinery, crated units |
| Freighter main deck, select positions | 96 × 125 in (244 × 318 cm) | ~300 cm | Out-of-gauge pieces |
| Above 300 cm | — | — | Charter or ocean breakbulk |
The 163 cm belly limit is the one that catches people out. Build a pallet to 180 cm and your Miami→Bogotá booking moves to a freighter — different schedule, different rate, different cut-off.
Measure to the outside of the wrap
Include every centimeter of overhang past the pallet edge and the pallet's own 12-15 cm height. A 120 × 100 cm pallet with 4 cm of overhang on each side measures 128 × 108 cm. On a 150 cm build, that is 2.07 m³ instead of 1.80 m³ — 45 extra kg of air volumetric weight on one pallet.
Multi-piece air shipments total every piece before comparing actual against volumetric. Courier compares each box on its own. Non-stackable pallets bill on the full height of the slot they block, not on the cargo height.
How can I reduce the volumetric weight of my shipment to pay less?
Quick Answer: Reduce volumetric weight by cutting box height, removing dead air, nesting items and choosing cartons that match the cargo. Dropping a 60 × 40 × 50 cm box to 60 × 40 × 35 cm cuts air volumetric weight from 20 kg to 14 kg — a 30% reduction with no change to the goods inside.
On a 60 × 40 cm footprint, every 5 cm of unused height adds 2 kg of air volumetric weight. Find the dead air and you find the savings.
- Right-size the carton to the product footprint instead of using a standard stock box
- Consolidate several small boxes into one well-packed carton, staying under courier surcharge thresholds
- Flat-pack and nest wherever the product allows — remove legs, stack bowls, collapse frames
- Swap foam blocks for air pillows that compress under stacking pressure
- Keep courier boxes under 10,368 in³ to avoid additional handling, and under 17,280 in³ to avoid large package status
Let the calculator find the box
The volumetric weight calculator on this page suggests a box size that would bill less for the same contents. Test two or three carton options before you commit to a packaging purchase order. One carton redesign on a recurring e-commerce lane pays for itself in a month.
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Go to the calculator →How do I get a real air or courier rate on my billed weight?
Quick Answer: Enter each box's length, width, height, weight and quantity in the calculator on this page, pick the Air cargo, Courier or Ocean tab, then press Get live rates. It fills the rate calculator at #quote-calc with the same boxes and returns 2026 pricing for your lane in seconds, with no signup.
Price depends on chargeable weight, origin gateway, destination airport, commodity and service level — never on actual weight alone.
Which gateway serves your region
- Florida → Miami; Texas and the central states → Houston
- California and the Southwest → Los Angeles/Long Beach
- The Northeast → New York/New Jersey; the Southeast → Savannah
- The Midwest → by rail through Chicago; the Pacific Northwest → Seattle
- Ontario → Toronto; Quebec and the Atlantic provinces → Montreal; Western Canada → Vancouver
Air cargo quotes come per chargeable kilo plus fuel and security surcharges. Courier quotes come all-in per box. With thousands of shipments processed across the USA–Latin America corridor, the gap between the two usually turns around 70-100 kg chargeable.
To dispute a re-measurement, request the carrier's dimensioner record for that tracking number. Pair it with your pre-pickup photos. For shipments that carry paper only, our Free Courier Documents Calculator: USA to Peru 2026 shows the flat-rate document pricing that skips DIM weight entirely.
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Go to the calculator →Measure your cartons once, enter them in the volumetric weight calculator on this page, and you will see the billed weight an airline or a courier will actually invoice — plus the cubic meters an LCL booking would charge. Then press Get live rates to price those same boxes on your lane.
Volumetric weight is the space your shipment occupies expressed as a weight. Multiply length × width × height in centimeters and divide by 6,000 for air cargo or 5,000 for express courier; in inches, divide by 166 or 139 respectively. The calculator on this page does it for every box and quantity at once.
Divide by 6,000 for air cargo booked on an air waybill under IATA rules, and by 5,000 for FedEx, UPS or DHL Express courier shipments. The same box therefore bills about 20% heavier on courier than on air cargo. Always confirm the divisor in your carrier contract before booking.
Actual weight is what the scale reads; chargeable weight is the higher of actual and volumetric weight, and it is the figure your invoice uses. Air cargo compares the two across the whole shipment and rounds up to the next 0.5 kg, while courier compares them box by box.
One cubic meter of air freight bills as 167 kg under the IATA divisor of 6,000, since 1,000,000 cm³ ÷ 6,000 = 166.67 kg. Under the courier divisor of 5,000 the same cubic meter bills as 200 kg. Cargo denser than that bills on actual weight instead.
Cut dead air from your cartons, flat-pack and nest items, and choose a box that matches the product footprint. Dropping a 60 × 40 × 50 cm carton to 60 × 40 × 35 cm cuts air volumetric weight from 20 kg to 14 kg. Staying under 10,368 in³ also avoids courier additional handling fees.