Volumetric weight explained: how to calculate it for sea, air and road (2026)
Last updated: 8 July 2026
If you’ve ever been billed more than expected for shipping something light but bulky — a box of pillows, a lampshade, a stack of folded clothing — volumetric weight is almost certainly why. Carriers don’t only charge for how much your shipment weighs. They charge for whichever resource it uses more of: weight or space.
This guide explains what volumetric weight is, exactly how to calculate it for sea, air, and courier freight, and why the same package can have a different chargeable weight depending on which carrier and mode you use.
What is volumetric weight?
Volumetric weight (also called dimensional weight or cubic weight) converts the physical size of a shipment into an equivalent weight figure for billing. Carriers always charge based on the higher of two numbers: your shipment’s actual weight, or its volumetric weight. This exists because cargo space on a plane, ship, or truck is limited — a large, light parcel can take up the same physical space as a small, heavy one, so pricing based on weight alone would let bulky shipments undercharge for the space they occupy.
How to calculate volumetric weight
The formula is the same shape across modes — multiply length, width, and height, then divide by a divisor specific to the carrier and transport type. The divisor is the only thing that changes.
Volumetric weight (kg) = (Length × Width × Height in cm) ÷ Divisor
Worked example: a box measuring 50cm × 68cm × 38cm.
Courier divisor (5,000): (50 × 68 × 38) ÷ 5,000 = 25.84 kg Air freight divisor (6,000): (50 × 68 × 38) ÷ 6,000 = 21.53 kg
The same physical box has two different volumetric weights depending on which carrier divisor applies — a difference of more than 4kg, which can change your shipping cost noticeably on a per-kg rate.
Divisor by carrier and mode
| Mode | Divisor | Formula |
|---|---|---|
| Sea / Air freight (IATA standard) | 6,000 | (L × W × H cm) ÷ 6,000 = kg |
| Express courier (DHL, FedEx, UPS) | 5,000 | (L × W × H cm) ÷ 5,000 = kg |
| Budget / regional carriers | 4,000 | (L × W × H cm) ÷ 4,000 = kg |
Always confirm the exact divisor with your specific carrier before budgeting freight costs — the same shipment’s volumetric weight can vary by up to 20% between divisors.
Sea freight is calculated differently — the 1 CBM = 1,000 kg rule
Sea freight, particularly LCL (less-than-container-load) shipments, does not use a divisor at all. Instead, ocean freight pricing applies a fixed density assumption: 1 cubic meter of cargo is treated as equivalent to 1,000 kg for billing purposes.
Worked example: a shipment with a volume of 4.8 m³ and an actual weight of 2,000 kg.
Volumetric equivalent: 4.8 × 1,000 = 4,800 kg Chargeable weight: higher of 2,000 kg actual or 4,800 kg volumetric = 4,800 kg
In this case, the shipment is billed on its volume, not its actual weight, because the cargo is relatively light for the space it occupies. Use our free CBM calculator to get your CBM and sea freight chargeable weight instantly. If you’re shipping a full container rather than LCL, start from the exact internal capacity in our guide to shipping container dimensions.
What is chargeable weight?
Chargeable weight is the figure a carrier actually bills you for. It is always the higher of actual weight and volumetric weight — never the lower, and never an average of the two. Dense, heavy cargo (machine parts, metal goods) is usually billed on actual weight. Bulky, light cargo (textiles, foam, furniture) is usually billed on volumetric weight. Knowing which one applies to your shipment before booking helps you budget accurately and, in some cases, repack more efficiently to reduce volumetric weight. For full-container loads, our container loading calculator turns the same dimensions into a 3D placement that accounts for stacking and weight distribution.
Compare your chargeable weight across all three divisors instantly
Teuvia’s free CBM calculator shows sea/air, courier, and budget carrier volumetric weight side by side — no signup required.
Try the free CBM calculator →Frequently asked questions
What is volumetric weight?
Volumetric weight, also called dimensional weight, converts the physical size of a shipment into an equivalent weight for billing purposes. Carriers charge based on whichever is higher: the actual weight or the volumetric weight. This protects carriers from underpricing large, lightweight shipments that take up significant space but weigh very little.
How do I calculate volumetric weight?
Multiply length, width, and height in centimetres, then divide by the carrier’s divisor. Air freight and ocean freight typically use a divisor of 6,000. Express couriers like DHL, FedEx, and UPS typically use 5,000. For example, a box measuring 50×68×38cm divided by 5,000 gives a volumetric weight of 25.84 kg.
Why do different carriers use different divisors?
Each transport mode has different cost structures for space versus weight. Air freight space is extremely limited and expensive, so it uses a stricter divisor. Express couriers handle smaller parcels with different vehicle economics, so they typically use a slightly different divisor. Always confirm directly with your specific carrier, as the same shipment can have a volumetric weight that differs by up to 20% depending on which divisor applies.
What is chargeable weight?
Chargeable weight is the weight a carrier actually bills you for — calculated as the higher of your shipment’s actual weight or its volumetric weight. If your cargo is dense and heavy, actual weight is usually higher and you pay based on that. If your cargo is bulky but light, volumetric weight is usually higher and you pay based on that instead.
How is volumetric weight calculated for sea freight?
Sea freight LCL (less than container load) pricing typically uses a fixed density assumption rather than a divisor: 1 cubic meter (CBM) is treated as equivalent to 1,000 kg. Your chargeable weight for sea freight is the higher of your actual cargo weight or your CBM multiplied by 1,000.
Why is my volumetric weight higher than my actual weight?
This happens when cargo is large relative to its weight — common with pillows, packaging materials, clothing, or furniture. Carriers charge for whichever resource your shipment uses more of: physical space or mass. When your cargo takes up more relative space than weight, the carrier bills based on the space it occupies instead of what it weighs.
Is there a free tool to calculate volumetric weight?
Yes — Teuvia’s free CBM calculator computes volumetric weight at all three common divisors (sea/air at 6,000, courier at 5,000, and budget carriers at 4,000) side by side, so you can compare your chargeable weight across carrier types instantly without signing up.
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