Single Slope Room Surface calculator.
Measure wall and ceiling areas in a rectangular room with two different specified side-wall heights.
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.
Measure wall and ceiling areas in a rectangular room with two different specified side-wall heights. Existing specified geometry only; no habitable-room or structural requirements.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Room length parallel to level ceiling edges
- 4 m
- Horizontal room width across slope
- 3 m
- Low side-wall height
- 2 m
- High side-wall height
- 2 m
- Measured wall opening area
- 0 m²
Net walls plus sloping ceiling: 40 m²
One plane, rectangular footprint and linear height change. No attic access, headroom, roof structure or room compliance is assessed.
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.
Existing specified geometry only; no habitable-room or structural requirements.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.