Plywood Calculator
Calculate plywood sheets needed for floors, walls, roofs, or cabinets. Choose from 6 plywood types, 5 thicknesses, and get weight and cost estimates.
📐 Plywood Calculator
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💡 How to Calculate Plywood Sheets
Plywood is one of the most versatile building materials used in US construction. From structural subfloors and roof sheathing to cabinetry and furniture, understanding plywood types, thicknesses, and quantities is essential for accurate project planning and budgeting.
The calculator above supports 6 plywood types, 5 thicknesses, two sheet sizes (4×8 and 4×4), and provides weight per sheet and total weight — critical for delivery planning and structural load calculations.
Measure area with our square footage calculator. For framing lumber, see our lumber calculator. For drywall, try our drywall calculator.
Plywood Types Comparison
| Type | Grade | Best For | ¾" Weight (4×8) | ¾" Cost (4×8) |
|---|---|---|---|---|
| CDX | C-D Exposure 1 | Subfloors, roof sheathing, wall sheathing | ~60 lbs | $35–$50 |
| OSB | Structural 1 | Roof decking, wall sheathing, subfloors | ~55 lbs | $25–$35 |
| Sanded (BC/AC) | B-C or A-C | Cabinets, shelving, furniture, visible surfaces | ~65 lbs | $45–$65 |
| Marine Grade | A-A or A-B | Boats, docks, outdoor furniture, wet environments | ~70 lbs | $70–$100 |
| Baltic Birch | BB/BB or BB/CP | Fine furniture, laser cutting, drawer boxes | ~68 lbs | $60–$85 |
| MDF | Standard | Cabinet doors, trim, paintable surfaces | ~85 lbs | $30–$40 |
Note: CDX and OSB are the two most common structural plywood types. CDX is true plywood (cross-laminated veneers); OSB is made from compressed wood strands. Both are code-approved for structural use, but CDX handles moisture better.
Plywood Thickness: Nominal vs. Actual
| Nominal | Actual Thickness | Weight (4×8, CDX) | Common Use |
|---|---|---|---|
| ¼" | 7/32" (0.219") | ~24 lbs | Underlayment, cabinet backs, craft projects |
| ⅜" | 11/32" (0.344") | ~33 lbs | Wall sheathing (non-structural), hobby projects |
| ½" | 15/32" (0.469") | ~42 lbs | Roof sheathing, wall sheathing, shelving |
| ⅝" | 19/32" (0.594") | ~51 lbs | Subfloor (16" OC joists), heavy shelving |
| ¾" | 23/32" (0.719") | ~60 lbs | Subfloor (24" OC joists), workbenches, heavy-duty |
Important: Nominal and actual plywood thicknesses differ by 1/32" to 1/16" due to sanding. This matters for cabinetry and precision joinery — always measure before cutting dados and rabbets.
Step-by-Step Plywood Estimation
Step 1: Measure the Area
Measure the length and width of each surface to cover. Multiply to get square footage. For multiple walls or sections, calculate each separately and add together.
Example: A room 20 ft × 12 ft = 240 sq ft of subfloor.
Step 2: Add Waste
Add 10% for rectangular rooms (simple cuts). Add 15% for L-shaped rooms, corners, and cutouts. Add 20% for complex shapes like hexagonal or curved surfaces.
Example: 240 sq ft × 1.10 = 264 sq ft.
Step 3: Divide by Sheet Area
Standard 4×8 sheet = 32 sq ft. Half sheet (4×4) = 16 sq ft. Round up to the nearest whole sheet — you can't buy partial sheets.
Example: 264 ÷ 32 = 8.25 → 9 sheets.
Plywood by Project
| Project | Recommended Type | Thickness | Notes |
|---|---|---|---|
| Subfloor | CDX or OSB | ¾" (23/32") | Use T&G (tongue-and-groove) for 24" OC joists |
| Roof Sheathing | CDX or OSB | ½" or ⅝" | ½" for 16" OC rafters; ⅝" for 24" OC |
| Wall Sheathing | CDX or OSB | ⅜" or ½" | Structural: ½" min. Non-structural: ⅜" |
| Underlayment | Sanded BC | ¼" | Over existing subfloor before vinyl/tile |
| Cabinets | Sanded AC or Baltic Birch | ¾" | AC for painted, Baltic Birch for clear finish |
| Shelving | Sanded BC or Baltic Birch | ¾" | Max span without support: 36" for ¾" plywood |
2025 US Plywood Cost Guide
| Type | ½" (4×8) | ¾" (4×8) | Notes |
|---|---|---|---|
| CDX | $28–$38 | $35–$50 | Most common structural plywood |
| OSB | $20–$28 | $25–$35 | Cheapest structural option |
| Sanded BC | $35–$45 | $45–$65 | One good face, one utility face |
| Sanded AC | $40–$55 | $55–$75 | One premium face for cabinetry |
| Baltic Birch | $50–$65 | $60–$85 | 5×5 ft sheets standard (not 4×8) |
| Marine Grade | $55–$75 | $70–$100 | Waterproof glue, void-free core |
Delivery: Most lumberyards charge $50–$100 for delivery. Big-box stores often deliver free on orders over $500. A pallet typically holds 40–60 sheets (depending on thickness). Plan for pallets weighing 2,000–3,500 lbs.