Calculatrice de précision

Roof Area Calculator

Roof Area Calculator: Calculate a roof section area from measured dimensions. For pitched roofs, measure the actual roof surface or

Dimensions de la pièce

Facteur de gaspillage de matériauxFACULTATIF

Estimer le coût du matérielFACULTATIF

Calculation Results
1 ft (12 in) 1 ft 1 ft² = 144 in²

Roof Area Calculator

Calculate measured roof-section area. For slopes, measure the surface or apply a separate pitch calculation before ordering materials.

Comment ça marche

1

Sélectionnez la forme

Choose the shape that matches your space.

2

Entrez les dimensions

Saisissez les mesures dans n’importe quelle unité. Ajoutez la quantité, le facteur de gaspillage et le prix du matériau.

3

Obtenez des résultats

Visualisez la superficie en pi², po², yd², m², acres ainsi qu'une estimation des coûts, le tout en même temps.

Foire aux questions

On a simple gable roof, measure base length and width, then multiply by a slope factor: 1.054 for 4/12 pitch, 1.118 for 6/12, 1.202 for 8/12. Or measure the roof surface directly if you can reach it safely.
One roofing square is 100 sq ft. Shingles and underlayment are sold by the square. Divide roof area by 100 for squares needed. Add 10 to 15% for ridges, valleys, and cuts.
Measure the building footprint (length × width) and multiply by a pitch factor for your slope. Satellite tools and roof measurement apps help too. Complex roofs with dormers need each section measured separately.
Use 10% for simple gable roofs. Use 15% for hip roofs, dormers, or valleys. Use 15 to 20% for complex roofs with skylights and penetrations. Steep roofs waste more because cuts are harder.
Ceiling area is flat: room length × width below. Roof area includes slope, so it is larger. A vaulted or cathedral ceiling matches roof area for that section. Flat ceilings match floor area.
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