Calcolatrice di precisione

Roof Area Calculator

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

Dimensioni della stanza

Fattore di scarto materialeOPZIONALE

Stima del costo del materialeOPZIONALE

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.

Come funziona

1

Seleziona Forma

Choose the shape that matches your space.

2

Inserisci le dimensioni

Immettere le misurazioni in qualsiasi unità. Aggiungi quantità, fattore di scarto e prezzo del materiale.

3

Ottieni risultati

Visualizza l'area in ft², in², yd², m², acri più stima dei costi, tutto in una volta.

Domande frequenti

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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