Plywood Calculator

How many sheets of plywood do I need? Enter project dimensions, sheet size, and waste — get an instant count for roofing, subfloor, walls, and sheathing.

10% is the standard starting point for most projects.

Lumber & Framing Planning Checklist

Covers framing layout, spacing, span tables, hardware, material grade, and sequencing before purchasing plywood or sheet goods.

Download Checklist (PDF)

Planning use only. See Methodology and Data Sources. View all project checklists →

Plywood Calculator — Sheets, Area & Coverage Guide

This calculator estimates how many plywood sheets you need for any project — roofing sheathing, subfloor, wall panels, shed framing, or furniture. Enter project length and width, choose your sheet size, and add a waste factor for an instant rounded-up sheet count.

Sheets Needed — Quick Reference

Project area4×8 ft sheets (0% waste)4×8 ft sheets (10% waste)Coverage per sheet
100 ft²4 sheets4 sheets32 ft² per sheet
200 ft²7 sheets7 sheets32 ft² per sheet
400 ft²13 sheets14 sheets32 ft² per sheet
600 ft²19 sheets21 sheets32 ft² per sheet
800 ft²25 sheets28 sheets32 ft² per sheet
1,000 ft²32 sheets35 sheets32 ft² per sheet

Standard 4×8 ft sheet = 32 sq ft. 400 ft² highlighted as typical subfloor or roof section. Always round up to whole sheets.

How Many Square Feet Does N Sheets of Plywood Cover?

Going the other direction from the table above: if you already know how many sheets you have (or a supplier quoted you a sheet count), here's the coverage you get at the standard 32 sq ft per 4×8 sheet.

SheetsCoverage (4×8 ft)SheetsCoverage (4×8 ft)
1 sheet32 ft²8 sheets256 ft²
2 sheets64 ft²10 sheets320 ft²
3 sheets96 ft²12 sheets384 ft²
4 sheets128 ft²16 sheets512 ft²
5 sheets160 ft²20 sheets640 ft²
6 sheets192 ft²25 sheets800 ft²

Based on standard 4×8 ft (32 ft²) sheets. For 4×10 ft sheets, multiply sheet count by 40 ft² instead.

Plywood Sheet Sizes

Sheet sizeArea per sheetCommon use
4 × 8 ft32 ft² (2.97 m²)Subfloor, roof sheathing, wall sheathing, general use
4 × 10 ft40 ft² (3.72 m²)Longer span floors, walls with tall ceilings
5 × 5 ft25 ft² (2.32 m²)Specialty, marine, Baltic birch panels
1220 × 2440 mm2.98 m² (32.1 ft²)Metric equivalent of 4×8 — international standard
1200 × 2400 mm2.88 m² (31.0 ft²)Common metric size — slightly smaller than 4×8

How Many Sheets Come in a Bundle?

Plywood is typically shipped and sold in bundles (also called units or lifts), with sheet count per bundle determined by thickness — thinner sheets stack higher before hitting a weight or height limit. These are typical ranges; always confirm exact bundle counts with your specific supplier, since they vary by manufacturer and product line.

ThicknessTypical sheets per bundle
1/4" (6 mm)90–100
3/8" (9 mm)60–70
1/2" (12 mm)45–50
5/8" (15 mm)40–45
3/4" (18 mm)32–40

Buying by the bundle is usually more economical per sheet than buying individual sheets, but check whether your project actually needs a full bundle before committing — leftover odd thicknesses are harder to use up than standard 1/2" or 3/4".

How to Calculate Plywood Sheets

The formula: sheets = ceil(project area ÷ sheet area × (1 + waste%)). For a 20×12 ft subfloor (240 sq ft) with 4×8 sheets (32 sq ft) and 10% waste: 240 ÷ 32 × 1.10 = 8.25 → 9 sheets.

For roofing, calculate sloped area first using the Roof Square Footage Calculator, then use 15% waste to account for angled eave and ridge cuts.

Frequently Asked Questions

Divide project area by sheet area, multiply by your waste factor, and round up. For a 20×12 ft floor (240 sq ft) with 4×8 sheets and 10% waste: 240 ÷ 32 × 1.10 = 8.25 → 9 sheets. Enter your dimensions in the calculator above for an instant result.
A standard 4×8 ft sheet of plywood is 32 square feet (48×96 inches). A 4×10 ft sheet is 40 sq ft. To find total coverage, multiply your sheet count by 32 — for example, 2 sheets = 64 sq ft, and 10 sheets = 320 sq ft. See the coverage table above for more sheet counts.
A 12×12 ft room = 144 sq ft. With 4×8 sheets (32 sq ft) and 10% waste: 144 ÷ 32 × 1.10 = 4.95 → 5 sheets. Without waste: still 5 sheets (rounded up from 4.5). Always add at least 10% — even simple rectangular floors have waste at edges.
Calculate sloped roof area first (flat footprint × pitch factor), then divide by 32 sq ft per sheet and add 15% waste for angled eave and ridge cuts. For a 1,000 sq ft footprint at 6/12 pitch (slope factor 1.118): 1,118 sq ft ÷ 32 = 35 sheets base + 15% = 41 sheets. Use the Roof Square Footage Calculator to get your sloped area first.
Use 10% for most projects — the standard for rectangular subfloors, wall sheathing, and simple layouts. Use 15% for roofing (angled eave and ridge cuts add significant waste). Use 5% only for very modular layouts where almost every sheet is used full-size with minimal trimming.
The US standard is 4×8 ft (48×96 inches) — 32 square feet per sheet. This is the most widely available size at lumber yards and home improvement stores. Other common sizes: 4×10 ft (40 sq ft) for taller walls or longer spans, 5×5 ft for specialty applications, and 1220×2440 mm for metric markets.
It depends on thickness — thinner sheets stack higher per bundle. Typical ranges: 1/4" ≈ 90–100 sheets, 3/8" ≈ 60–70, 1/2" ≈ 45–50, 5/8" ≈ 40–45, 3/4" ≈ 32–40 sheets per bundle. These vary by manufacturer, so confirm the exact count with your supplier before ordering by the bundle.

Related Lumber & Framing Calculators

Lumber Calculator Board Foot Calculator Stud Calculator Deck Calculator Roof Square Footage Calculator Roof Truss Calculator

Disclaimer: Estimates are for general planning only. Actual quantities depend on layout complexity, cut patterns, material grade, and structural requirements. See Data Sources for the sheet-size and waste-factor references used above.

See Methodology and Data Sources for details.