Air Freight Chargeable Weight Calculator

Air freight booked through a forwarder is rated with the IATA volumetric standard: volumetric weight (kg) = L × W × H (cm) ÷ 6,000 — equivalently, 1 CBM ≈ 167 kg. The airline charges the chargeable weight: whichever is greater between the shipment’s total actual weight and total volumetric weight.

Note the difference from express couriers: DHL, UPS and FedEx use a 5,000 divisor and compare per piece, while air cargo compares the shipment total. A 10-carton consignment with mixed dense and light boxes can be cheaper as air cargo purely because of the comparison rule — see per-piece vs per-shipment billing for a worked example, or use the divisor toggle on the main calculator to compare both.

Chargeable Weight Rate Breaks: 45 / 100 / 300 / 500 kg

Airlines price per kg of chargeable weight with break points at 45 / 100 / 300 / 500 / 1000 kg. A shipment charging at 92 kg is often worth rating "as 100 kg" if the ≥100 kg rate is lower — ask your forwarder to check.

Chargeable weight is the greater of actual weight and volumetric weight. Four steps, in this order — the order matters, because each carrier rule only ever moves the number up:

1. Measure length, width and height at the outermost points — pallet feet, bulging tape, protruding handles included.
2. Multiply and divide by the divisor for your mode: ÷6,000 for IATA air cargo, ÷5,000 for express couriers.
3. Compare against the scale weight and take the greater. Air cargo compares shipment totals; couriers compare per piece.
4. Apply the carrier’s rounding.

Chargeable Weight in CM and KG

A 120 × 80 × 100 cm carton at 60 kg actual: 960,000 cm³ ÷ 6,000 = 160 kg volumetric, against 60 kg actual, so the chargeable weight is 160 kg. You pay for nearly three times the scale weight because air freight prices the space, not the mass.

Chargeable Weight in Inches and Pounds

Shipping in imperial? The IATA equivalent is 366 in³ per kg, or 166 in³ per lb. A 48 × 32 × 40 in crate is 61,440 in³ ÷ 366 = 168 kg. Note that UPS and FedEx US domestic use a different figure — ÷139 in³/lb — and round every fractional dimension up to the next whole inch. The calculator above mixes units freely: measure in inches, read the answer in kg.

One cubic metre of air cargo is rated as 166.67 kg — usually quoted as 167. That is simply 1,000,000 cm³ ÷ 6,000. So 2.4 CBM of light goods weighing 180 kg on the scale gives 401 kg volumetric against 180 kg actual: the chargeable weight is 401 kg.

The same cubic metre is rated differently everywhere else — 200 kg by express courier, 250 kg on Australian cubic, 1,000 kg by sea. There is no universal answer to “how many kilos is a CBM”; see CBM to kg for all four rules, and chargeable vs actual vs gross weight if the terminology itself is the confusing part.

Chargeable weight is only half the equation. Airlines price per kilogram in rate breaks — the per-kg rate drops as the shipment crosses weight thresholds, which means a heavier shipment sometimes costs less in total.

The "rate as if heavier" trick

Suppose your chargeable weight is 92 kg. At the Q45 rate of USD 4.20/kg that is USD 386. But the Q100 rate might be USD 3.60/kg, and 100 × 3.60 = USD 360 — cheaper to declare and pay for 100 kg than for the 92 kg you actually have. Freight forwarders call this rating at the higher break, and any competent forwarder checks it automatically. Ask if your quote near a threshold (44, 95, 290, 490 kg) has been checked both ways.

What else lands on the invoice

• Fuel and security surcharges — quoted per chargeable kg, revised monthly, often 20–40% of the freight line.
• Terminal handling at origin and destination, usually per shipment or per 100 kg.
• Airway bill and screening fees, typically flat per shipment.
• Customs clearance and delivery, which express courier rates usually bundle but air cargo quotes almost never do. Comparing an air cargo quote to a courier quote without adding these is the most common apples-to-oranges error.

Chargeable Weight Rounding Conventions

Airlines round each dimension to the nearest whole centimetre, then round the chargeable weight up — usually to the next 0.5 kg, sometimes to the next full kilogram on smaller consignments. Volume is measured per piece and summed for the shipment total, which is where the per-shipment comparison rule gives air cargo an advantage over courier billing on mixed dense-and-bulky consignments.

Comparing modes before you book? The express calculator covers courier ÷5,000 rules and the CBM calculator handles sea freight revenue tons.