🪟 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
Calculatrices Connexes
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.
📖 Comment Utiliser la Calculatrice
Mesurez la surface.
Sélectionnez le type de coffrage.
Entrez le facteur de réutilisation.
Entrez le coût par unité.
Cliquez sur Calculer.
Passez en revue les détails.
📐 Formules de Matériaux
⚠️ Erreurs Courantes
Sous-estimer les plaques.
Ignorer le gaspillage de découpe.
Mauvais espacement.
Ignorer le poids du béton.
Ignorer le décoffrage.
💡 Conseils Professionnels
Utilisez du contreplaqué filmé de haute qualité.
Assurez un support adéquat.
Calculez la pression du béton.
Planifiez la séquence de décoffrage.
Appliquez l'huile uniformément.
Inspectez tous les composants.
Stockez correctement.
❓ Questions Fréquentes
Dépend de la qualité. Standard 5 à 8 fois. Haute qualité 15 à 25 fois.
Commun: 12, 15 et 18 mm. Pour les murs 15 à 18 mm.
Divisez la superficie par l'espacement.
Dépend de la conception. Typiquement 2 à 4 mètres par heure.
Dépend de la résistance. Murs 12 à 24 heures. Dalles 7 à 14 jours.
🏗️ Applications Réelles
Utilisez notre calculatrice pour estimer les matériaux et coûts de coffrage.
✅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.