DIY

Deck Board Calculator

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate decking boards needed by deck size. Spacing and waste included. Free calculator.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

How to Use This Calculator
Getting Accurate Results

Le Calcul

Lames standard : 14 cm de large avec 5 mm d'espacement. Nombre de rangées = largeur terrasse ÷ 14,5 cm. Terrasse de 4×5 m avec lames perpendiculaires au côté 5 m : 28 rangées × longueur de lame. Ajoutez 10% de chutes. Le composite ne nécessite aucun entretien mais coûte 2-3× le bois traité.

Bois vs Composite

Pin traité : 15-30 €/m², entretien tous les 2-3 ans. Composite : 40-80 €/m², zéro entretien. Sur 20 ans, le coût total est similaire quand on inclut le traitement du bois. Le seuil de rentabilité du composite : ~7 ans.

⚡ CalcWolf Insight

The most overlooked deck expense: hidden fasteners. Face-screwing is the cheapest method ($0.02/screw) but leaves visible screw heads that collect dirt and moisture. Hidden clip systems ($0.25-0.50/board-foot) create a clean surface with no visible fasteners — worth every penny on a composite deck where aesthetics matter.

Frequently asked questions

Combien de lames pour 4×5 m ?▾

~28 rangées. En lames de 2,40 m : ~60 lames + 10% = 66. En 4 m : 28 lames + 10% = 31.

Bois ou composite ?▾

Bois : moins cher au départ, entretien annuel. Composite : 2-3× plus cher, zéro entretien pendant 25+ ans.

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Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →