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Category Logistics & Shipping

#	Length	Width	Height	Qty	CBM/unit	CBM total

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About

Freight costs are driven by two competing measurements: actual weight and volumetric weight. Carriers bill whichever is greater. A miscalculated CBM (Cubic Meter) value leads directly to unexpected surcharges, misbooked container space, or wasted capacity. This calculator computes CBM from package dimensions, derives volumetric weight using industry-standard divisors (1000 kg/m³ for sea freight per IMO guidelines, 167 kg/m³ for air freight per IATA standards), and estimates how many units fit into standard ISO 668 containers. It handles mixed-size shipments with per-line quantity support.

Accuracy depends on measuring the outermost points of each carton, including bulges and strapping. The tool assumes rectangular parcels stacked without interstitial optimization. Real container utilization varies between 75% and 85% depending on cargo regularity, palletization, and stacking constraints. Pro tip: always round dimensions up to the nearest centimeter before entry. Carriers do the same.

Formulas

The cubic meter volume for a single rectangular package is computed as the product of its three outer dimensions converted to meters:

CBM = L100 × W100 × H100

Where L, W, H are measured in cm. For a shipment line with quantity Q:

CBM_line = CBM_unit × Q

Total shipment volume sums all lines:

CBM_total = n∑i=1 CBM_i

Volumetric (dimensional) weight converts volume to a weight equivalent using a carrier-specific divisor D:

W_vol = CBM_total × D

Where D = 1000 kg/m³ for ocean freight, D = 167 kg/m³ for air freight (IATA), and D = 200 kg/m³ for express courier (DHL/FedEx/UPS standard). Container load estimation divides total CBM by usable container volume:

N_containers = CBM_totalV_usable

Reference Data

Container Type	ISO Code	Internal L m	Internal W m	Internal H m	Max Volume m³	Usable Volume m³	Max Payload kg	Tare Weight kg
20ft Standard (GP)	22G1	5.898	2.352	2.393	33.2	25-28	28,200	2,300
40ft Standard (GP)	42G1	12.032	2.352	2.393	67.7	54-58	26,780	3,800
40ft High Cube (HC)	45G1	12.032	2.352	2.698	76.3	61-65	26,580	4,020
20ft Refrigerated	22R1	5.444	2.294	2.274	28.4	22-24	27,400	3,100
40ft Refrigerated	42R1	11.561	2.294	2.274	60.3	48-51	26,280	4,800
20ft Open Top	22U1	5.893	2.346	2.346	32.4	25-27	28,100	2,400
40ft Open Top	42U1	12.024	2.346	2.346	66.2	53-56	26,630	3,900
20ft Flat Rack	22P1	5.662	2.438	2.327	32.1	24-27	27,600	2,900
40ft Flat Rack	42P1	12.064	2.438	2.103	61.8	49-52	26,100	4,500
45ft High Cube	L5G1	13.556	2.352	2.698	86.1	69-73	27,600	4,800
Air ULD LD3 (AKE)	AKE	1.534	1.562	1.143	4.3	3.5-3.8	1,588	80
Air ULD LD7 (PAG)	PAG	3.175	2.235	1.625	11.5	9-10	4,626	160

Frequently Asked Questions

Carriers compare actual (gross) weight against volumetric weight and bill whichever is higher. Volumetric weight is calculated by multiplying the total CBM by a mode-specific divisor: 1000 kg/m³ for sea freight, 167 kg/m³ for air freight (IATA standard), or 200 kg/m³ for express couriers. Lightweight but bulky cargo - such as foam, plastics, or furniture - almost always triggers volumetric billing. Calculate both values before booking to avoid surprises.

Always measure external (outermost) dimensions. Carriers stack and load based on how much physical space a parcel occupies, not its internal cavity. Include any protrusions, handles, strapping, or irregular bulges. Round each measurement up to the nearest full centimeter. Underreporting dimensions can result in re-measurement surcharges at the warehouse, typically 2-5 times the correction fee.

The calculator uses industry-standard usable volumes: approximately 25-28 m³ for a 20ft GP, 54-58 m³ for a 40ft GP, and 61-65 m³ for a 40ft HC. These account for 75-85% utilization of the theoretical maximum. Actual utilization depends on cargo regularity (cubes stack better than cylinders), palletization (pallets waste corner space), stacking limits (fragile goods cannot bear weight), and load planning software. Treat the estimate as an upper bound for planning, not a guarantee.

CBM (cubic meters) is the raw physical volume of your cargo. Volumetric weight is a financial construct that converts that volume into a weight-equivalent number for billing purposes. The conversion factor (divisor) varies by transport mode. For ocean freight, 1 m³ = 1000 kg volumetric. For air, 1 m³ = 167 kg volumetric. The carrier charges based on whichever is greater: actual weight or volumetric weight. This system prevents carriers from filling aircraft or vessels with featherweight cargo that occupies all the space but generates little revenue.

Standard EUR pallets (1200 × 800 mm) and ISO pallets (1200 × 1000 mm) introduce dead space. A 20ft container fits approximately 10 EUR pallets floor-loaded in a single tier. The pallet itself adds 144 mm of height. If your boxes do not tile perfectly onto pallet footprints, gaps remain. As a rule of thumb, palletized cargo utilizes 60-70% of container volume versus 75-85% for loose-loaded cartons. Factor pallet dimensions into your length and width inputs when computing palletized shipments.

Yes. Each row in the calculator represents a distinct package type with its own dimensions and quantity. The total CBM sums across all rows. This is critical for mixed-SKU shipments where carton sizes vary. Add one row per unique carton dimension. If you have 50 boxes of size A and 30 boxes of size B, enter two rows with quantities 50 and 30 respectively.