CBM to CFT Conversion: Cubic Meters to Cubic Feet Chart

Ocean freight runs on cubic meters (CBM). Your freight forwarder quotes per CBM, the packing list totals CBM, and the bill of lading shows it. Once the boxes clear the port and move into a US warehouse or onto a less-than-truckload (LTL) truck, the numbers switch to cubic feet: freight class is set by density in pounds per cubic foot, and some warehouses bill storage by the cubic foot. So the same cargo gets converted from CBM to CFT (cubic feet) at least once, and often by more than one person. This guide gives you the factor, a quick chart, a way to check the math in your head, and the spots where the conversion usually goes wrong.

CBM to cubic feet: the conversion factor#

One cubic meter is 35.3147 cubic feet. For day-to-day work, 35.315 is precise enough. Going the other way, one cubic foot is 0.0283168 m³.

Cubic feet = cubic meters × 35.315

Cubic meters = cubic feet ÷ 35.315

A 2.4 m³ LCL shipment is 2.4 × 35.315 = 84.76 ft³. A 120 ft³ load quoted by a US trucker is 120 ÷ 35.315 = 3.40 m³.

For a sense of scale: a foot is 30.48 cm, so a cubic foot is a cube 30.48 cm on each side. About 35 of them fit in one cubic meter.

CBM to CFT conversion chart#

The left half converts cubic meters to cubic feet; the right half converts cubic feet to cubic meters. The two halves are separate lists, so a row does not pair equal values across the table.

The container rows use Hapag-Lloyd’s published internal volumes. They describe the empty container, not what you can load: once you stack real boxes, the usable space is smaller. ISO 668 standardizes container external dimensions and minimum internal dimensions, but it does not set these volume figures. For the full set of inside measurements, see container dimensions; for how much cargo actually fits, see CBM per container.

Checking the math in your head#

You won’t always have a calculator open, for example when a trucker reads a number over the phone. Two shortcuts get you within about 1%.

CBM to cubic feet: multiply by 35, then add 1%. 35 × 1.01 = 35.35, which is only about 0.1% above the real factor. For 12 m³: 12 × 35 = 420, plus 1% is about 424 ft³. The exact figure is 423.8.

Cubic feet to CBM: anchor on 100 ft³ ≈ 2.83 m³. Scale from there. 750 ft³ is 7.5 × 2.83 ≈ 21.2 m³ (exact: 21.24).

Keep the container volumes in mind as a ceiling: roughly 1,170 ft³ for a 20’, 2,390 ft³ for a 40’ and 2,700 ft³ for a 40’ high cube. If a shipment that is supposed to fit in one container converts to more than that, either the conversion or the packing list is wrong.

Use these shortcuts only to catch errors. Anything that goes on paper, whether a quote, an invoice, a customs entry or the density you declare to a carrier, should use 35.315.

From inches straight to cubic feet#

If your dimensions are already in inches, as they usually are on a US pallet, skip meters altogether:

Cubic feet = length × width × height (in) ÷ 1,728

1,728 is 12 × 12 × 12, the number of cubic inches in a cubic foot. A 48 × 40 × 60 in pallet works out to 115,200 cubic inches ÷ 1,728 = 66.67 ft³, or 1.89 m³.

For LTL, cubic feet are only a step on the way to density: divide the weight in pounds by the cubic feet to get pounds per cubic foot, and that number decides the freight class under the National Motor Freight Classification (NMFC). The freight density calculation guide walks through it.

Which unit each document and rate uses#

Air freight skips both units. The volumetric weight (usually called dimensional weight in the US) is the total in cubic centimeters divided by 6,000, which gives kilograms, and the chargeable weight is the greater of that and the actual weight. Cubic meters and cubic feet are each one multiplication away from the same cubic-centimeter total, so neither is the working unit.

Storage is where a CBM figure most often turns into a bill. Say you bring 8.5 m³ into a warehouse that charges $0.55 per cubic foot per month (an example rate, not a market figure). 8.5 × 35.315 = 300.2 ft³, so the storage charges come to about $165 a month.

The CBM calculator takes each box’s dimensions, the quantity and the weight per box, and returns the shipment total in cubic meters with the cubic-foot figure shown alongside it. It does not break cubic feet out line by line; you get one total in both units, and the copied results include both.

Where CBM to CFT conversions go wrong#

Rounding the factor to 35. 35 ÷ 35.3147 understates the cubic feet by about 0.9%. The gap looks small, but for LTL it can matter: fewer cubic feet means a higher calculated density, so freight sitting just below a density break can get pushed over it and declared in a lower class than it belongs in. If the carrier reweighs and inspects the shipment, it can be reclassified.

Converting in the wrong direction. The cubic-foot number should be about 35 times the cubic-meter number. If your result got smaller after converting m³ to ft³, you divided when you should have multiplied.

Rounding each box, then multiplying by quantity. A box of 0.099 m³ rounded to 0.10 m³ and multiplied by 250 gives 25.0 m³. The real total is 24.75 m³. That 0.25 m³ gap is about 8.8 ft³ you would be paying to store or ship. Add up the total first, then convert once.

Confusing a measurement ton with a metric ton. A measurement ton is a unit of volume: 40 ft³ (about 1.133 m³) in the US and 42 ft³ in the UK. It is neither a metric ton (1,000 kg) nor a cubic foot. Read a per-ton rate as a per-cubic-foot rate and you are off by a factor of 40. Read it as a metric ton and the error depends on how dense the cargo is, so there is no fixed multiple. Most LCL rates today are set per cubic meter or per 1,000 kg, whichever is greater (1 m³ counts the same as 1,000 kg). The measurement ton lingers in some older tariffs and port charge schedules.

Keep the precision until the end#

Don’t round the cubic meters before you multiply. Carry every digit through the multiplication and round only the cubic-foot result, once, at the end. This is a separate rule from adding up before converting: it applies even when you are working from a single total.

Check whether an invoice’s cubic-foot figure is per piece or for the whole shipment before you compare it with your own numbers.

If a quote mixes air freight or express legs with a US inland leg, keep the air and express parts in metric (cm³) and bring in cubic feet only for the US inland leg.

For how CBM is defined and measured in the first place, see what CBM is.

Example: one shipment, three units on three invoices#

A shipper moves 250 boxes from Ningbo to Long Beach. Each box measures 55 × 45 × 40 cm and weighs 12 kg, which is 0.099 m³ per box. The total is 24.75 m³ and 3,000 kg.

Ocean leg, in cubic meters. The forwarder quotes and bills the LCL freight on 24.75 m³.

Warehouse, in cubic feet. At the Long Beach warehouse, 24.75 × 35.315 = 874.0 ft³. At an example rate of $0.50 per cubic foot per month, storage runs about $437 a month.

LTL, in pounds per cubic foot. 3,000 kg is about 6,614 lb. 6,614 ÷ 874 ≈ 7.6 lb per cubic foot, which falls in the 6 to under 8 band: class 125 on the NMFC density scale from Docket 2025-1 (effective July 19, 2025). Check the full table in the freight class chart.

This example, like the CBM calculator, divides total weight by total volume. Under NMFC rules, density is normally worked out for each handling unit (each pallet, crate or loose piece) separately; the combined figure is the exception, used when the shipping papers show only a total weight.

The physical volume never changes, but it gets billed three ways: cubic meters for the ocean leg, cubic feet for storage and pounds per cubic foot for LTL. Convert the total once and record both the m³ and ft³ figures together, so everyone downstream starts from the same number. You can open this shipment in the CBM calculator. The total tile shows 24.8 m³ (rounded to one decimal) and 874.0 ft³.