How to Calculate the Area of Container Houses

There are three main methods for calculating the area of container houses: interior area calculation, building area calculation, and theoretical building area calculation, as detailed below:

Interior Area Calculation

The interior area refers to the actual usable space inside a container house, typically excluding the thickness of walls and structural elements like columns. The formula for calculation is: Interior Area = Container Length × Container Width × Container Height. When using this formula, note that length, width, and height should be measured in meters and represent the internal actual dimensions, which are generally slightly smaller than the external dimensions. Multiple containers can be combined to expand the usable space. For example, a container with internal dimensions of 6 meters in length, 2.4 meters in width, and 2.5 meters in height has an interior area of 6 × 2.4 × 2.5 = 36 cubic meters (if only calculating the floor area, it would be 6 × 2.4 = 14.4 square meters).

Building Area Calculation

• Unit Accumulation Method: Based on standard container sizes, the projected area of a 20-foot container is approximately 14.8 square meters, and that of a 40-foot container is about 28 square meters. When multiple containers are combined, the total area is obtained by summing the areas of each unit.
• On-site Measurement Method: For completed container buildings, precise usable area is obtained by measuring the entire structure, including public areas such as corridors and connection points.
• Calculation of Special Structural Elements: For overhanging parts (e.g., awnings, balconies), if supported by columns, calculate based on the horizontal area enclosed by the column perimeters; for independent columns, calculate based on half of the horizontal projected area of the roof. For entrance areas, if there is a permanent roof, calculate based on the horizontal projected area of the roof; if there is no roof, do not calculate the area. For modified openings, the area of the removed side walls is still calculated based on the original outer perimeter, and the opening cannot be deducted. For roof platforms, if there is an enclosing structure, calculate the full area based on the outer perimeter of the enclosing structure; if there is no enclosing structure, calculate based on half of the projected area.
• Impact of Floor Height: When the floor height of a container building exceeds 2.2 meters, the full area should be calculated; for parts with a floor height of less than 2.2 meters, calculate based on half of the area. For multi-story buildings, calculate layer by layer.

Theoretical Building Area Calculation

Calculate based on the horizontal projected area of the outer walls of the container. The theoretical building areas of common containers are as follows: a 20-foot standard container, with a length of 6.058 meters, a width of 2.438 meters, and a height of 2.591 meters, has a theoretical building area of 14.77 square meters; a 40-foot standard container, with a length of 12.192 meters, a width of 2.438 meters, and a height of 2.591 meters, has a theoretical building area of 29.73 square meters; a 40-foot high cube container, with a length of 12.192 meters, a width of 2.438 meters, and a height of 2.896 meters, has a theoretical building area of 29.73 square meters.