Shipping Container Calculators | CBM, Loading, Stuffing & Container Size

Shipping Container Calculators

Use individual calculators for cargo volume, container selection, stuffing, dimensions, payload and special container requirements.

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Shipping Container Calculators

Calculate cargo volume, container capacity, loading requirements, pallet quantities, payload, container dimensions and oversized cargo requirements for common shipping containers.

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Container Loading & Stuffing

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CBM, Cargo & Volume

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Pallet & Package Loading

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Container Dimensions & Selection

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OOG & Special Containers

Quick Container Dimension & Capacity Calculator

Enter up to 5 different cargo types. The calculator checks the physical cargo dimensions first and then calculates CBM and an estimated container quantity.

Dimension Exception Detected

Shipping Line Check Required

✓ All cargo dimensions fit within at least one standard container reference size.

Standard Shipping Container Dimensions

The dimensions below are approximate reference dimensions used for preliminary calculations. Actual container dimensions, door openings, payload and equipment specifications can vary by manufacturer and shipping line.

Container Type Internal Length Internal Width Internal Height Practical Working CBM
20ft Standard 589 cm 235 cm 239 cm Approximately 28 CBM
40ft Standard 1203 cm 235 cm 239 cm Approximately 56 CBM
40ft High Cube 1203 cm 235 cm 269 cm Approximately 65 CBM

Shipping Container Calculator Formula

Cargo CBM Formula

When cargo dimensions are entered in centimetres:

CBM = Length × Width × Height × Quantity ÷ 1,000,000

Example

If 4 packages measure 150 × 110 × 100 cm:

150 × 110 × 100 × 4 ÷ 1,000,000 = 6.60 CBM

Physical Dimension Formula

The calculator does not rely on CBM alone. Each individual cargo piece must physically fit within the applicable container dimensions.

Length and width may be switched horizontally:

Cargo Length ≤ Container Length AND Cargo Width ≤ Container Width

OR:

Cargo Width ≤ Container Length AND Cargo Length ≤ Container Width

Cargo height is checked separately:

Cargo Height ≤ Container Internal Height

Important Height Rule

The calculator does not rotate cargo height into the container length or width. For example, a cargo with dimensions 100 × 100 × 300 cm has a height of 300 cm. Because 300 cm exceeds the approximate internal height of standard 20ft, 40ft and 40HC containers, it will produce a dimension exception.

Choosing the Right Shipping Container

20ft Standard Container

A 20ft container is commonly used for general cargo, machinery, cartons, pallets and shipments where cargo volume and weight are suitable for a smaller container.

40ft Standard Container

A 40ft standard container provides substantially more floor length than a 20ft container and is commonly used for larger-volume general cargo.

40ft High Cube Container

A 40HC container provides additional internal height compared with a standard dry container and is frequently used for high-volume cargo where additional vertical space is useful.

Open Top Container

Open Top containers can be considered for cargo that requires special top loading or where conventional door loading is not practical.

Flat Rack Container

Flat racks are commonly considered for oversized and out-of-gauge cargo that cannot be loaded within standard dry-container dimensions.

Shipping Line Container Requirements

Container selection should not be based on CBM alone. Before booking equipment, verify the actual container specifications and cargo acceptance requirements with the relevant shipping line.

  • Confirm cargo length, width and height including packaging.
  • Check the container internal dimensions.
  • Check container door opening dimensions.
  • Confirm gross cargo weight and permitted payload.
  • Consider cargo weight distribution and floor loading.
  • Allow sufficient space for dunnage and lashing.
  • Check whether cargo is oversized or out-of-gauge.
  • Confirm special equipment availability before booking.
  • Obtain shipping-line approval where dimensions exceed standard container limits.

Shipping Container Calculator FAQ

Can a 300 cm high cargo fit inside a 20ft container?

No. The calculator compares cargo height directly with the approximate 239 cm internal height of a standard 20ft container. A 300 cm height therefore produces a dimension exception.

Can a 300 cm high cargo fit inside a standard 40ft container?

No. A standard 40ft container has an approximate internal height of 239 cm, so 300 cm exceeds the standard internal height.

Can a 250 cm high cargo fit in a 40HC?

Based on the approximate 269 cm reference internal height used by this calculator, a 250 cm cargo height can pass the height check for a 40HC. Actual equipment must still be confirmed.

Does CBM alone determine container quantity?

No. CBM is a volume calculation. Cargo dimensions, weight, loading arrangement, stacking, securing, door opening and shipping-line restrictions can affect the actual requirement.

What happens when cargo exceeds standard dimensions?

The calculator displays Dimension Exception Detected and Shipping Line Check Required instead of showing the normal standard-container quantity result.

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© 2026 Smart Unit Calc. All rights reserved.

Shipping container calculations are provided for preliminary planning. Confirm actual equipment specifications and shipping-line acceptance before booking.