🪟 Shuttering / Formwork Calculator PRO
Shuttering area, plywood sheets, release oil, labour & material cost for slab, beam, column & staircase.
Formwork Panel — updates as you type
Member faces with walers. Plywood follows the contact area divided by sheet size.
1 Member Type
2 Member Dimensions
3 Material & Labour Rates
Results
Shuttering Area
Materials
Cost Breakdown
Professional Shuttering Guide
Show formulas, plywood specs & tips ▼
Area Formulas
Slab:Area = L × W (contact area with concrete bottom face)
Beam:Area = 2 × (W + D) × L (bottom + 2 sides)
Column:Area = 2 × (W + D) × L (all 4 faces, L = height)
Staircase:Area = L × W + 2 × (W + D) × L (slab bottom + waist + sides)
Plywood Specifications
| Size | Area | Reuses |
|---|---|---|
| 4 × 8 ft | 32 sq ft | 8-12 |
| 4 × 10 ft | 40 sq ft | 8-12 |
Release Agent Guidelines
- Apply 1 coat before each pour for clean stripping
- Coverage: 40-60 sq ft/L depending on plywood condition
- Used oil is cheaper but may stain concrete — use proper form oil
- Budget 10-15% extra for waste and re-coating
Common Mistakes
- Not allowing for plywood reuses — proper oil extends life significantly
- Ignoring bracing requirements — inadequate support causes blowouts
- Using wrong plywood grade — BWR/BS grade for wet concrete contact
- Skipping edge sealing — raw plywood edges absorb water and swell
- Not factoring waste — always add 10-15% for cuts and damaged sheets
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 |
|---|---|---|---|
Saved rates auto-apply from your Price Library. Advanced details stay in your browser — nothing is uploaded except inside your own PDF/Excel exports.
📖 Como Usar a Calculadora
Meça a área.
Selecione o tipo.
Insira o fator de reutilização.
Insira o custo por unidade.
Clique em Calcular.
Revise os detalhes.
📐 Fórmulas de Materiais
⚠️ Erros Comuns
Subestimar chapas.
Ignorar desperdício de corte.
Espaçamento incorreto.
Ignorar peso do concreto.
Ignorar tempo de desforma.
💡 Dicas Profissionais
Use compensado filmado de alta qualidade.
Assegure suporte adequado.
Calcule pressão do concreto.
Planeje a sequência de desforma.
Aplique óleo uniformemente.
Inspeccione todos os componentes.
Armazene corretamente.
❓ Perguntas Frequentes
Depende da qualidade. Padrão 5 a 8 vezes. Alta qualidade 15 a 25 vezes.
Comum: 12, 15 e 18 mm. Para paredes 15 a 18 mm.
Divida a área pelo espaçamento.
Depende do projeto. Tipicamente 2 a 4 metros por hora.
Depende da resistência. Paredes 12 a 24 horas. Lajes 7 a 14 dias.
🏗️ Aplicações Reais
Use nossa calculadora para estimar materiais e custos de forma.
✅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.