DIY

How Many Sheets of Plywood Do You Need?

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate the number of 4×8 plywood sheets for subflooring, sheathing, and projects.

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

In this article

Plywood Sheet Sizes and Coverage
Plywood Grades Explained
Thickness Selection Guide

Chapas Padrão

No Brasil: 122 × 244 cm (2,97 m²) ou 110 × 220 cm (2,42 m²). Para cobrir 30 m²: 30 ÷ 2,97 = 10,1 chapas + 10% = 11. Espessuras comuns: 6, 10, 12, 15, 18 mm. OSB é 30-40% mais barato mas menos resistente à umidade.

Por Uso

Fundo de móvel: 6 mm. Divisória leve: 10 mm. Prateleira: 15-18 mm. Forma para concreto: 12-18 mm. O MDF é preferido para móveis (superfície mais lisa). O compensado naval resiste à umidade mas custa 2-3× o padrão.

⚡ CalcWolf Insight

When buying plywood, inspect each sheet at the store. Plywood can warp, delaminate, or have voids in lower grades. Stand the sheet on edge — it should be straight with no twist. Check edges for delamination (separation of layers). This 30-second inspection prevents project headaches.

Frequently asked questions

Quantas chapas para 20 m²?▾

20 ÷ 2,97 = 7 chapas + 10% = 8. Para muitos recortes: 15-20% a mais.

OSB ou compensado?▾

OSB: mais barato, bom para estruturas ocultas. Compensado: mais forte, melhor para umidade.

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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 →