Projected or actual area?
Projected area is the horizontal footprint. Actual area corrects it for pitch and is the recommended purchasing basis.
Free professional tool
Actual roof area calculator
Trace each roof plane, assign pitch, and calculate actual area, waste, and material quantities. Everything runs in your browser.
Private and local
Your plans, photos, and project data are never sent to or stored on our servers.
Automatic local save
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Measurement desk
Start from manual dimensions or a plan. Calibrate a plan with a known distance or its printed scale.
PNG, JPG, WebP, or first PDF page 路 25 MB maximum
What is a roof plane? It is each continuous surface of the roof, flat or sloped. Trace any section with a different pitch separately, then close the polygon.
Your measurement desk is ready
Upload a plan or add a manual surface. You can also trace directly on this grid.
Add a manual surface
Use this when you already know the width and length of a rectangular roof plane and want to add it without tracing. Choose Horizontal projection for dimensions measured from above; choose Actual surface for dimensions measured directly along the slope.
Selected roof plane
Select a roof plane on the plan to edit it.
Linear measurements
Record ridges, hips, valleys, eaves, rakes, and flashing to calculate linear accessories.
02
Materials and quantities
Area with waste feeds area materials. Edit coverage using the manufacturer data sheet.
03
Report and collaboration
The link includes geometry, results, title, and calculation labels; it excludes the plan, client, address, and your branding.
Quick answers
Is my plan uploaded?
No. Processing, saving, and reporting happen in this browser.
Does this replace a site visit?
No. This is an estimating tool; confirm dimensions, laps, and field conditions before buying.