Calculatrice de Bardeaux

Dernière mise à jour: 2026-06-23

Utilisez le Calculatrice de Bardeaux pour obtenir des résultats précis. Saisissez vos valeurs ci-dessous.
Données
Résultat
Entrez les valeurs et appuyez sur Calculer
Common Sizes — Click to Fill
Longueur du toit (m) Largeur du toit (m) Pente du toit Bardeaux par botte (pcs)
8 m 5 m 4 33 pcs
10 m 7 m 4 33 pcs
12 m 8 m 6 33 pcs
15 m 10 m 6 33 pcs
20 m 12 m 8 33 pcs
Outils associés
Calculatrice Placo Calculatrice d'Isolation Calculatrice Escaliers Béton Calculateur Béton de Masse

Qu'est-ce que le Roofing Shingle Calculator?

Ordering the wrong amount of roofing shingles is an expensive mistake — shingles are sold in bundles and squares, and prices vary widely. Too few and the job stops mid-roof; too many and you're paying for materials you'll never use. The Roofing Shingle Calculator accounts for your roof's actual pitch using the pitch factor formula, so you get an accurate bundle count for sloped roofs of any angle.

You may also find the Drywall Calculator, Insulation Batt Calculator, and Concrete Steps Calculator useful.

Qui utilise cette calculatrice?

This tool is used by homeowners re-roofing a house, roofers estimating material costs, and contractors preparing bids.

Comment utiliser the Roofing Shingle Calculator

  1. Saisissez votre Roof length.
  2. Saisissez votre Roof width.
  3. Saisissez votre Roof pitch.
  4. Saisissez votre Shingles per bundle.
  5. Cliquez sur Calculer pour voir vos résultats instantanément.

Formule

The calculator uses the following formula:

Pitch factor = sqrt(1 + (pitch/12)²); Roof area = L × W × pitch_factor; Bundles = ceil(area ÷ 9.29 × 3)

Exemple de calcul

A roof that is 12 m long × 8 m wide with a 6/12 pitch has a pitch factor of 1.118, giving an actual area of 107 m². That requires approximately 35 bundles (3 bundles per square, where 1 square = 9.29 m²).

Calcul étape par étape

  1. Flat footprint: 12 m × 8 m = 96 m²
  2. Pitch factor for 4/12 pitch: sqrt(1 + (4/12)²) = 1.054
  3. Actual roof area: 96 × 1.054 = 101.2 m²
  4. Roofing squares (1 square = 9.29 m²): 101.2 ÷ 9.29 = 10.9 squares
  5. Bundles (3 per square + 10% waste): ceil(10.9 × 3 × 1.1) = 36 bundles

Erreurs courantes à éviter

  • Using the floor footprint area instead of actual roof surface area
  • Forgetting to account for roof pitch when ordering materials
  • Not adding 10-15% for waste, valleys, and hip cuts
Pro Tip: Always order 10–15% extra for waste, ridge caps, hips, and valleys. Shingles from the same production run have matching colour — mixing runs can cause visible colour differences.

Questions fréquentes

What is a roofing square?
A roofing square equals 100 square feet (about 9.29 m²). Most shingles come 3 bundles per square, though premium architectural shingles may need 4 bundles per square.

How does roof pitch affect material quantities?
Steeper roofs have more actual surface area than their footprint suggests. A 12/12 pitch (45°) requires 41% more shingles than a flat area of the same floor dimensions.

What is the pitch factor and how is it calculated?
Pitch factor = √(1 + (pitch/12)²). For a 6/12 pitch: √(1 + 0.25) = 1.118. Multiply your floor area by this factor to get actual roof surface area.

Do I need to include the overhang in my measurements?
Yes — measure the full roof surface including any eave overhang, not just the building footprint. Overhangs typically add 15–30 cm per side.

How long do asphalt shingles last?
Standard 3-tab shingles last 20–25 years. Architectural (dimensional) shingles last 30–50 years. Metal roofing can exceed 50 years. Lifespan depends on climate, ventilation, and installation quality.

Écrit et révisé par l'équipe éditoriale de CalcToWork. Dernière mise à jour : 2026-06-23.

calcto.work — Calculated on 2026-06-23