Roof Area Calculator
Roof Area Calculator
Estimate flat or pitched roof surface from a footprint.
A pitched roof has more surface than its horizontal footprint. Using the footprint alone can understate the material requirement.
Enter the simple roof geometry, pitch and horizontal overhang. Use a measured layout for roofs with valleys, dormers or several intersecting planes.
How to use Roof Area Calculator
- Choose roof type and measurement unit. Enter building length, building width and horizontal overhang each edge.
- Enter pitch angle, ordering allowance and covering quote.
- Select Calculate estimate. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.
Why choose this tool?
The calculation makes the effect of pitch visible before you compare roofing coverage or coating quantities.
Before you use the result
Assumes simple planes with no dormers, valleys or roof openings. Enter horizontal overhang.
Questions about Roof Area Calculator
Can it handle every roof shape?
No. It assumes simple planes. Treat openings, valleys and complicated junctions through a measured roof schedule rather than a single footprint.
What should I check before using Roof Area Calculator?
Check Roof type, Measurement unit, Building length and Building width. Use the exact units shown beside the controls and replace any example values with your own inputs.
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