Roof Area Table: Sloped roof area by Roof footprint length
Reference table of sloped roof area for Roof Area across a range of roof footprint length values — exact, engine-computed figures you can read off at a glance.
Roof Area Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Sloped roof area
89.44
- Footprint area
- 80.00
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Roof Area Calculator
The Roof Area Calculator works out your sloped roof area, along with 1 related figure in an instant. Enter roof footprint length, roof footprint width and pitch rise and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the roof footprint length.
- Enter the roof footprint width.
- Enter the pitch rise.
- Enter the pitch run.
- Read off your sloped roof area, together with footprint area — the calculator updates automatically, with no button to press.
Formula
The Roof Area Calculator uses the formula:
Sloped roof area = Roof footprint length × Roof footprint width × √(Pitch run ^ 2 + Pitch rise ^ 2) ÷ Pitch run
Worked example
For example, with roof footprint length of 10 m, roof footprint width of 8 m, pitch rise of 6 and pitch run of 12, the sloped roof area is 89.44.
| Roof footprint length | 10 m |
|---|---|
| Roof footprint width | 8 m |
| Pitch rise | 6 |
| Pitch run | 12 |
| Sloped roof area | 89.44 |
|---|---|
| Footprint area | 80.00 |
Results are estimates for educational use, not professional advice.
Key terms explained
- Area
- The amount of two-dimensional space a shape covers, measured in square units.
Frequently asked questions
Multiply the footprint by the pitch multiplier, √(run² + rise²) ÷ run. A 10×8 m footprint at 6:12 pitch is about 89.4 m².
It is the slope, given as rise over run, such as 6:12 meaning 6 units of rise per 12 of run.
The roof surface tilts, so it covers more material than the flat ground area beneath it.
Yes. Include eaves and verges in the footprint, and add waste for hips, valleys and cuts.
The Roof Area Calculator uses the formula: Sloped roof area = Roof footprint length × Roof footprint width × √(Pitch run ^ 2 + Pitch rise ^ 2) ÷ Pitch run. For example, with roof footprint length of 10 m, roof footprint width of 8 m, pitch rise of 6 and pitch run of 12, the sloped roof area is 89.44.
Enter the roof footprint length. Enter the roof footprint width. Enter the pitch rise. Enter the pitch run. Read off your sloped roof area, together with footprint area — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Roof Area: Formula, Steps & Examples
Learn how to calculate Roof Area — the formula explained step by step, with worked examples and a free calculator to check your answer.