Box Surface Area calculator.
Measure the exposed area of a rectangular box with an optional open top.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
Inside and outside dimensions describe different surfaces. Choose one measurement basis; wall thickness is not inferred.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Length
- 2 m
- Width
- 3 m
- Height
- 4 m
- Top configuration
- Open top
Exposed box surface: 46 m²
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.