⬜Drywall Calculator PRO
Multi-room estimator with sheet types, finish levels, compound coats, corner bead, vapor barrier, and insulation.
Dimension Diagram — first room, updates as you type
Wall area comes from the perimeter × ceiling height, minus door and window openings. Ceiling adds length × width.
1 Rooms
6 mil poly sheeting — required in cold climates
Batt insulation — R-13 to R-30
2 Project & Pricing
Labour Cost
3 Material Breakdown
Project Totals
Results
Material Quantities
Coverage
Cost Breakdown
⚠️ Pre-Export Checklist
- Room dimensions verified on-site
- All openings accounted for (doors, windows, pass-throughs)
- Ceiling height confirmed (standard 8ft or custom)
- Fire-rated drywall needed? (check local code for garages/between units)
- Moisture-resistant board for bathrooms/basements/kitchens
- Vapor barrier required by code in your climate zone?
- Corner bead type confirmed (inside/outside/bullnose)
- Screw type matches stud material (coarse for wood, fine for metal)
How to Estimate Drywall for a Room
Show formulas, finish levels, and worked examples ▼
Formulas
Wall Area= Perimeter × Ceiling Height − Openings
Ceiling Area= Room Length × Room Width
Total Area= Wall Area + Ceiling Area
Sheets Needed= Total Area ÷ Sheet Area (32/36/48 sq ft) × (1 + waste%)
Screws= Total Area ÷ (spacing/12) × stud_count — typically 1 screw per 12" o.c. on each stud
Joint Compound= Total Area × coat_factor ÷ coverage_per_box
Tape= Total Area × tape_factor ÷ coverage_per_roll
Finish Levels (Gypsum Association GA-214)
- Level 0: No finishing — temporary or non-visible areas
- Level 1: Tape embedded in compound, no further coating — attic/Plenum spaces
- Level 2: One coat over tape — utilitarian areas (garage, warehouse)
- Level 3: Two coats over tape — areas to receive heavy texture or tile
- Level 4: Three coats over tape — standard residential walls under flat paint
- Level 5: Skim coat over Level 4 — critical lighting areas, gloss paint, or dark colors
Worked Example
12 ft × 10 ft room, 8 ft ceiling, 2 openings (21 sq ft each), Level 4 finish:
- Wall perimeter: (12 + 10) × 2 = 44 lin ft
- Wall area: 44 × 8 − 42 = 310 sq ft
- Ceiling area: 12 × 10 = 120 sq ft
- Total area: 310 + 120 = 430 sq ft
- Sheets (4×8): 430 ÷ 32 × 1.10 = 15 sheets
- Screws (12" o.c.): 430 ÷ 12 × 4 studs ≈ 516 screws
- Compound (Level 4, 3 coats): 430 × 1.5 ÷ 300 = 3 boxes
- Tape: 430 × 0.8 ÷ 400 = 1 roll
Sheet Types Guide
- 1/2" Standard: Most common for walls in residential construction
- 5/8" Fire Code (Type X): Required in garages, between dwelling units, and for 1-hour fire ratings
- Moisture Resistant (Green Board): Use in bathrooms, kitchens, laundry rooms, and basements
- Soundproof (QuietRock): Reduces sound transmission by up to 90% — ideal for home theaters, studios, shared walls
Common Mistakes to Avoid
- Forgetting to subtract door and window openings
- Not accounting for ceiling — walls only estimate
- Under-ordering compound — Level 4/5 requires significantly more
- Buying exact number without waste — always add 10%
- Using wrong screw type — coarse for wood, fine for metal studs
- Skip vapor barrier in cold climates — moisture leads to mold
Drag to rotate — Scroll to zoom
Calculadoras Relacionadas
Frequently used together on the same project.
Client & Quote (prints on PDF & Excel)
Adjustments (applies to exports)
Contingency is added as a separate line on the exported cost summary. Waste % is printed as an advisory reminder.
Project notes (prints on PDF & Excel)
Result compare (A/B)
| Item | Pinned | Current | Change |
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Saved rates auto-apply from your Price Library. Advanced details stay in your browser — nothing is uploaded except inside your own PDF/Excel exports.
Estimar materiais de gesso costumava significar suposições e sobras. Nossa calculadora elimina o desperdício calculando quantidades exatas de chapas, massa, fita e parafusos. Insira as dimensões do cômodo e selecione o tamanho padrão (4x8, 4x9 ou 4x12).
Seja para terminar um porão, forrar uma garagem ou instalar gesso em um amplo salão, quantidades precisas evitam viagens caras à loja. Um quarto típico de 12x14 pés precisa de aproximadamente 10 chapas de 4x8.
A cobertura da massa depende do nível de acabamento. Nível 4 requer aproximadamente 0,054 galões por pé quadrado. Nível 5 adiciona uma demão completa.
📖 Como Usar a Calculadora de Gesso
Meça as Dimensões
Meça o comprimento e a altura de cada parede separadamente.
Marque Aberturas
Registre a largura e altura de cada janela e porta.
Selecione Tamanho da Chapa
Escolha chapas 4x8, 4x9 ou 4x12.
Escolha Nível de Acabamento
Selecione Nível 3, 4 ou 5.
Inclua ou Exclua Teto
Alterne se o teto está incluído.
Revise Lista de Materiais
A calculadora produz chapas, massa, fita e parafusos. Peça 10% extra.
📐 Fórmulas de Gesso e Cobertura
Área da placa: Área = Comprimento × Altura. Chapas: Chapas = Área Total / Área da Chapa. Massa: Nível 4 requer 4,3 lbs por 100 pés². Fita: Cada rolo cobre 75 pés de juntas. Parafusos: Paredes 12 polegadas, tetos 8 polegadas.
⚠️ Erros Comuns na Instalação de Gesso
Não subtrair aberturas
✓ Sempre subtraia janelas e portas.
Comprar apenas massa de emenda
✓ Emenda usa apenas 30% do total.
Comprimento de parafuso errado
✓ Use 1-5/8 polegadas para gesso 1/2 polegada.
Ignorar espaçamento do teto
✓ Tetos precisam de 8 polegadas.
Ignorar orientação
✓ Horizontal = menos juntas.
Subestimar massa Nível 5
✓ Nível 5 precisa 33% mais.
Arredondar para baixo
✓ 16,3 significa pedir 17.
💡 Dicas Profissionais para Gesso
Pendure horizontalmente quando possível
Aplique camadas finas de massa
Lixe entre camadas com grão 120
Alterne bordas das chapas
Deixe espaço de 1/8 polegada
Etiquete cada chapa
Peça 10% extra
Use prancha resistente à umidade
❓ Calculadora de Gesso — Perguntas Frequentes
Aproximadamente 17 chapas 4x8.
Cerca de 0,6 galões para Nível 4.
Nível 5 adiciona demão completa.
Sim, chapas 4x12 e acabamento Nível 4/5.
Aproximadamente 135.
Sim.
🏗️ Projetos de Gesso Reais
Terminar porão 20x25 pés precisa de 38 chapas e 11 galões de massa. Forrar garagem precisa de 45 chapas. Projeto comercial 2000 pés² precisa de aproximadamente 300 chapas.
Nossa calculadora de gesso fornece estimativas precisas de materiais para paredes, tetos e cômodos. Obtenha a quebra de chapas, massa, fita e parafusos instantaneamente.
✅Method, Sources & Review
Maintained by theBuildingCalc methods desk· Last reviewedSeptember 23, 2026. This calculator implements the standards and references below; every figure can be rechecked against the formulas and worked example on this page.
Results are estimates, not engineering advice. Verify against local codes and licensed professionals for structural, electrical, and gas work. See ourTerms. Spotted an error? Report it— corrections ship with the next review.