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Plywood sheet chart
Put your area and sheet coverage in: 400 square feet at 10% waste needs 13.75 sheets, order 14 sheets.
★ CONSTRUCTION · SHEETS · PLYWOOD
Plywood Sheet Chart: 14 Sheets for a 400 Sq Ft Area
On the defaults — a 400-square-foot area, sheets covering 32 square feet each, and 10% waste — you need 13.75 sheets of plywood exact, so order 14 sheets. This is the PLYWOOD version — sheets of plywood by area — the drywall-sheet-chart page is the DRYWALL version — sheets by wall area with a different waste rule; the paint-coverage-chart page is the PAINT version — gallons per room by wall area; and the tile-coverage-chart page is the TILE version — tiles and boxes by floor area.
What does 13.75 sheets mean?
It means a 400-square-foot area needs thirteen point seven five sheets of plywood once 10% waste is added: 400 × 1.10 ÷ 32 is 13.75, and since plywood is sold in whole sheets, the order is 14 sheets. The 1.10 is the whole story in miniature — cuts around edges, offcuts that are too small to reuse, and a damaged corner or two all eat material, so the bare area alone understates the order: without waste the same area needs exactly 12.50 sheets, and the waste one and a quarter sheets are what keep the last strip covered. The part people get wrong is ordering the exact figure when it is not whole: 13.75 sheets cannot be bought, and ordering 13 leaves most of a sheet of area bare.
Three things to check before you trust the number
Is the area really 400 square feet? Areas are rarely plain rectangles, so the measured area is where most orders go wrong: the 200-square-foot branch needs 6.88 sheets exact, order 7, while the 800-square-foot branch needs 27.50, order 28, for the same 32-square-foot sheets. Measure each section separately, length times width, add them, and subtract openings — a standard door is about 21 square feet, and leaving it in inflates the order.
Is the sheet coverage really 32 square feet? Sheet sizes vary, and the sheet count follows the coverage exactly: the 16-square-foot-coverage branch needs 27.50 sheets exact, order 28, while the 64-square-foot-coverage branch needs 6.88, order 7, for the same 400-square-foot area. Use the coverage from your sheet size — 4-by-8 feet is 32, 4-by-10 is 40, 4-by-12 is 48 — and if your layout wastes the offcuts, the usable coverage is smaller than the sheet area.
Have you ordered the rounded-up figure? This chart gives the exact sheets and the order sheets separately for a reason: plywood is sold in whole sheets, and a partial sheet is still a sheet you must buy. The headline exact figure is 13.75 sheets but the order is 14 sheets, and the 100-square-foot branch is 3.44 sheets exact but 4 sheets to order — ordering the exact figure leaves the last strip bare, and a short sheet ordered later may come from a different batch.
Worked example
On the defaults: 400 square feet, sheets covering 32 square feet, 10% waste.
- Area with waste: 400 × 1.10 is 440 square feet.
- Exact sheets: 440 ÷ 32 is 13.75 sheets.
- Order: 13.75 rounded up is 14 sheets.
And the other way: the area needing exactly 13.75 sheets at 32 square feet a sheet is 400 square feet, the sheet coverage needing exactly 13.75 sheets over 400 square feet is 32 square feet, and the area needing exactly 27.50 sheets at 32 square feet a sheet is 800 square feet.
Plywood sheets lookup: area × sheet coverage (10% waste included)
| Area | Sheet coverage | Area with waste | Exact sheets | Order sheets |
|---|---|---|---|---|
| 100 sq ft | 16 sq ft | 110 sq ft | 6.88 sheets | 7 sheets |
| 100 sq ft | 32 sq ft | 110 sq ft | 3.44 sheets | 4 sheets |
| 100 sq ft | 40 sq ft | 110 sq ft | 2.75 sheets | 3 sheets |
| 100 sq ft | 48 sq ft | 110 sq ft | 2.29 sheets | 3 sheets |
| 200 sq ft | 16 sq ft | 220 sq ft | 13.75 sheets | 14 sheets |
| 200 sq ft | 32 sq ft | 220 sq ft | 6.88 sheets | 7 sheets |
| 200 sq ft | 40 sq ft | 220 sq ft | 5.50 sheets | 6 sheets |
| 200 sq ft | 48 sq ft | 220 sq ft | 4.58 sheets | 5 sheets |
| 400 sq ft | 16 sq ft | 440 sq ft | 27.50 sheets | 28 sheets |
| 400 sq ft | 32 sq ft | 440 sq ft | 13.75 sheets | 14 sheets |
| 400 sq ft | 40 sq ft | 440 sq ft | 11.00 sheets | 11 sheets |
| 400 sq ft | 48 sq ft | 440 sq ft | 9.17 sheets | 10 sheets |
| 800 sq ft | 16 sq ft | 880 sq ft | 55.00 sheets | 55 sheets |
| 800 sq ft | 32 sq ft | 880 sq ft | 27.50 sheets | 28 sheets |
| 800 sq ft | 40 sq ft | 880 sq ft | 22.00 sheets | 22 sheets |
| 800 sq ft | 48 sq ft | 880 sq ft | 18.33 sheets | 19 sheets |
Exact sheets are area × 1.10 ÷ sheet coverage; order rounds up to whole sheets, so a 13.75-sheet figure orders 14 sheets and a 27.50-sheet figure orders exactly 28 sheets.
Every branch, checked
- 200 sq ft area, 32 sq ft sheets: 200 sq ft area, 32 sq ft sheets: 6.88 sheets exact — order 7 sheets.
- 800 sq ft area, 32 sq ft sheets: 800 sq ft area, 32 sq ft sheets: 27.50 sheets exact — order 28 sheets.
- 400 sq ft area, 16 sq ft sheets: 400 sq ft area, 16 sq ft sheets: 27.50 sheets exact — order 28 sheets.
- 400 sq ft area, 64 sq ft sheets: 400 sq ft area, 64 sq ft sheets: 6.88 sheets exact — order 7 sheets.
- 100 sq ft area, 32 sq ft sheets: 100 sq ft area, 32 sq ft sheets: 3.44 sheets exact — order 4 sheets.
- 1,000 sq ft area, 32 sq ft sheets: 1,000 sq ft area, 32 sq ft sheets: 34.38 sheets exact — order 35 sheets.
The reverses, worked backwards
- Area needing exactly 13.75 sheets at 32 sq ft a sheet: 400 sq ft — at 400 sq ft the figures are 13.75 sheets exact — order 14 sheets.; at the lower neighbor the figures are 12.03 sheets exact — order 13 sheets.; at the upper neighbor the figures are 15.47 sheets exact — order 16 sheets..
- Sheet coverage needing exactly 13.75 sheets over 400 sq ft: 32 sq ft — at 32 sq ft the figures are 13.75 sheets exact — order 14 sheets.; at the lower neighbor the figures are 15.71 sheets exact — order 16 sheets.; at the upper neighbor the figures are 12.22 sheets exact — order 13 sheets..
- Area needing exactly 27.50 sheets at 32 sq ft a sheet: 800 sq ft — at 800 sq ft the figures are 27.50 sheets exact — order 28 sheets.; at the lower neighbor the figures are 25.78 sheets exact — order 26 sheets.; at the upper neighbor the figures are 29.22 sheets exact — order 30 sheets..
What the defaults assume
The defaults are a 400-square-foot area and 32-square-foot sheets, so the headline is a medium room at the common 4-by-8 sheet size. The model is one multiplication, one division and one round-up: area times 1.10 for waste, divided by sheet coverage for sheets — with a tiny epsilon subtracted before the ceiling so a value landing exactly on a whole sheet, like 400 square feet at 44-square-foot coverage, orders that sheet and not one more. The area reverses are checked at 50 square feet either side; the coverage reverse is checked at 4 square feet either side. The model does not include cutting waste beyond the 10% allowance, irregular shapes, or sheets damaged in handling — for a cut-up layout with many small pieces, allow 15% waste instead of 10% by multiplying the area by 1.15 before dividing.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Area with waste | area × 1.10 | 440 sq ft — 400 × 1.10. |
| Exact sheets | area with waste ÷ sheet coverage | 13.75 sheets — 440 ÷ 32. |
| Order sheets | exact sheets rounded up to whole sheets | 14 sheets — 13.75 rounded up. |
| Area behind a target sheet count | target sheets × sheet coverage ÷ 1.10 | 400 sq ft — 13.75 × 32 ÷ 1.10. |
| Sheet coverage behind a target sheet count | area × 1.10 ÷ target sheets | 32 sq ft — 400 × 1.10 ÷ 13.75. |
| 200 sq ft area, 32 sq ft sheets | same model | 6.88 sheets exact — order 7 sheets. |
| 800 sq ft area, 32 sq ft sheets | same model | 27.50 sheets exact — order 28 sheets. |
| 400 sq ft area, 16 sq ft sheets | same model | 27.50 sheets exact — order 28 sheets. |
| 400 sq ft area, 64 sq ft sheets | same model | 6.88 sheets exact — order 7 sheets. |
| 100 sq ft area, 32 sq ft sheets | same model | 3.44 sheets exact — order 4 sheets. |
| 1,000 sq ft area, 32 sq ft sheets | same model | 34.38 sheets exact — order 35 sheets. |
| Area needing exactly 13.75 sheets at 32 sq ft a sheet | reverse | 400 sq ft: 13.75 sheets exact — order 14 sheets. |
| Sheet coverage needing exactly 13.75 sheets over 400 sq ft | reverse | 32 sq ft: 13.75 sheets exact — order 14 sheets. |
| Area needing exactly 27.50 sheets at 32 sq ft a sheet | reverse | 800 sq ft: 27.50 sheets exact — order 28 sheets. |
| 0 sq ft area | same model | 0.00 sheets exact — order 0 sheets. |
| Negative area | same model | Area — 0 or more. |
| Negative sheet coverage | same model | Sheet coverage — more than 0. |
| 400 sq ft, 44 sq ft sheets — exactly 10.00 sheets | same model | 10.00 sheets exact — order 10 sheets. |
Who uses this
- A homeowner sheathing a floor or wall — 400 square feet at 32 square feet a sheet is 13.75 sheets exact, order 14 sheets.
- A builder checking a supplier quote — the lookup table gives exact sheets and order sheets for four areas and four sheet sizes.
- Someone choosing a sheet size — the 16-square-foot branch needs 28 sheets and the 64-square-foot branch needs 7 for the same area.
- A buyer checking a delivery quote — the reverses give the area or sheet coverage behind any quoted sheet count.
Accuracy & limitations
Figures are the model’s own arithmetic on the numbers you type, computed from unrounded values and displayed rounded HALF_UP to 2dp, with order sheets rounded up to whole sheets. The main limitation is the layout itself, not the arithmetic: openings, irregular shapes and cut waste all move the real order, and the 10% waste figure is a standard allowance, not a measurement of your job. This page is a calculation tool, not a materials quote.
Cite this calculator
A 400 sq ft area at 10% waste needs 440 sq ft of plywood: 13.75 sheets exact at 32 sq ft a sheet, so order 14 sheets. Source: Bright Side Kit, https://brightoolbox.com/plywood-sheet-chart/, accessed 29 October 2026.
Frequently asked questions
How many sheets of plywood do I need?
Divide the area with waste by the sheet coverage, then round up: 400 square feet times 1.10 divided by 32 square feet is 13.75 sheets exact, so order 14 sheets.
Why add 10% waste?
Cuts around edges, offcuts too small to reuse, and a damaged corner all consume material. Without waste the same area needs exactly 12.50 sheets; the extra one and a quarter sheets are what keep the last strip covered.
Should I subtract doors and windows?
Yes. Measure each section's length times width, add them, then subtract about 21 square feet per standard door, or the sheet count will come out high and you will pay for sheets you cannot use.
What size is a standard plywood sheet?
The common sheet is 4 feet by 8 feet, which covers 32 square feet. Sheets also come 4-by-4 (16 square feet), 4-by-10 (40) and 4-by-12 (48) — use your actual sheet size in the calculator.
Why does the order round up instead of rounding to nearest?
Plywood is sold in whole sheets, and a partial sheet cannot cover a partial area. Rounding 13.75 down to 13 would leave most of a sheet of area bare; rounding up to 14 covers it with a little spare.
When should I allow more than 10% waste?
For a cut-up layout with many small pieces, stairs, or angled cuts, allow 15% waste instead of 10% by multiplying the area by 1.15 before dividing. The extra sheets are cheaper than a second delivery.