Calculadora de Telhas

Última atualização: 2026-05-07

Use a Calculadora de Telhas para obter resultados precisos. Insira os valores abaixo.
Dados
Resultado
Insira os valores e pressione Calcular
Common Sizes — Click to Fill
Comprimento do telhado (m) Largura do telhado (m) Inclinação do telhado Telhas por pacote (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
Ferramentas relacionadas
Calculadora de Drywall Calculadora de Isolamento Calculadora de Degraus de Concreto Calculadora de Concreto Simples

What is the 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.

Who Uses This Calculator?

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

How to Use the Roofing Shingle Calculator

  1. Enter your Roof length.
  2. Enter your Roof width.
  3. Enter your Roof pitch.
  4. Enter your Shingles per bundle.
  5. Click Calculate to see your results instantly.

Formula

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)

Worked Example

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).

Step-by-Step Calculation

  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

Erros comuns a evitar

  • 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.

Perguntas frequentes

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.

Escrito e revisado pela equipe editorial do CalcToWork. Última atualização: 2026-05-07.

calcto.work — Calculated on 2026-05-07