Calculadora de Drywall

Última atualização: 2026-06-23

Use a Calculadora de Drywall para obter resultados precisos. Insira os valores abaixo.
Dados
Resultado
Insira os valores e pressione Calcular
Common Sizes — Click to Fill
Comprimento da parede (m) Altura da parede (m) Tamanho da chapa Número de camadas (pcs)
4 m 2.4 m 2.88 1 pcs
6 m 2.4 m 2.88 1 pcs
8 m 2.7 m 2.88 1 pcs
10 m 2.7 m 2.88 1 pcs
12 m 3 m 3.6 2 pcs
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O que é o Drywall Calculator?

Drywall (plasterboard) is sold in standard sheet sizes — most commonly 1.2 m × 2.4 m — and cutting around doors, windows, and electrical boxes creates significant waste. This calculator divides your total wall and ceiling area by sheet size and adds an 8% waste factor to give you the exact sheet count to order.

You may also find the Retaining Wall Calculator, Roofing Shingle Calculator, and Insulation Batt Calculator useful.

Quem usa esta calculadora?

This tool is used by homeowners adding or replacing drywall, builders framing interior walls, and renovation contractors estimating material costs.

Como usar the Drywall Calculator

  1. Insira Wall length.
  2. Insira Wall height.
  3. Insira Sheet size.
  4. Insira Number of layers.
  5. Clique em Calcular para ver os resultados instantaneamente.

Fórmula

The calculator uses the following formula:

Area = Length × Height × layers; Sheets = ceil(area ÷ sheet_size × 1.08)

Exemplo de cálculo

A room with 60 m² of walls and ceiling using standard 1.2 × 2.4 m sheets requires 60 ÷ 2.88 = 20.8 sheets × 1.08 waste = 23 sheets.

Cálculo passo a passo

  1. Wall area: 6 m × 2.7 m = 16.2 m²
  2. Standard sheet (1.2 × 2.4 m) = 2.88 m²
  3. Sheets with 8% waste: ceil(16.2 ÷ 2.88 × 1.08) = 7 sheets
  4. Joint compound: ~0.5 kg/m² = 8 kg; Tape: ~1.5 m/m² = 24 m

Erros comuns a evitar

  • Calculating only the net area without adding waste for cuts around outlets
  • Forgetting ceiling drywall — it uses the same sheet size but needs different screws
  • Not accounting for double-layer firewall requirements in some rooms
Pro Tip: Hang drywall horizontally (long edge perpendicular to studs) for stronger walls with fewer butt joints. Butt joints are harder to finish than tapered edge joints — minimise them.

Perguntas frequentes

What thickness drywall should I use?
12.5 mm (1/2 inch) is standard for most interior walls and ceilings. Use 16 mm (5/8 inch) for fire-rated assemblies and ceilings with 600 mm joist spacing. 9.5 mm is used for curved walls.

How do I calculate drywall for a ceiling?
Calculate ceiling area separately from walls. For a flat ceiling, it's simply length × width. Vaulted ceilings require calculating the slope surface area using the pitch factor (same as roofing).

Why add 8% waste factor for drywall?
Cuts around doors, windows, outlets, and switches create off-cuts that are often too small to reuse. 8% is standard for simple rectangular rooms; complex rooms with many openings may need 10–12%.

Do I need moisture-resistant drywall in bathrooms?
Yes — use green board (moisture-resistant) or cement board behind tile in wet areas. Standard drywall absorbs moisture and will deteriorate behind tiles. Cement board is required in shower and tub surrounds by most building codes.

How long does drywall compound take to dry between coats?
Each coat of joint compound needs 24 hours to dry in normal conditions (20°C, 50% humidity). Speed up drying with fans and heat, or use setting-type compound which chemically hardens in 20–45 minutes regardless of humidity.

Escrito e revisado pela equipe editorial do CalcToWork. Última atualização: 2026-06-23.

calcto.work — Calculated on 2026-06-23