How many 2440 × 1220 mm sheets for a 4 × 3 m floor?
A 4 × 3 m floor (12 square metres) needs 5 sheets of 2440 × 1220 mm board with 10% waste — 4.43 sheets before rounding up.
How to work it out
- 4 m × 3 m = 12 m²
- 12 m² × 1.1 waste ÷ 2.98 m² per sheet = 4.43 → 5 sheets
In the UK and much of Europe, flooring-grade chipboard, OSB and plywood come in both 2440 × 1220 mm (the imperial 8 × 4 ft) and 2400 × 1200 mm. Check which your supplier stocks; the calculator above lets you switch.
Adjust for your project
More options: × · Openings · Waste allowance …
- Full-sheet layout count (no offcut reuse)
- 6 sheets · 1220 × 2440 mm
- Area to cover
- 12 m²
- Subfloor and roof sheathing run with the long edge across the joists or rafters, and end joints must land on framing — on small or odd-shaped areas that can push waste above 10%.
- If offcuts can’t start the next row (short runs, furniture, grain matching), a full-sheet layout needs 6 sheets — somewhere between that and 5 sheets is realistic.
Sheets for a 4 × 3 m floor by sheet size
| Sheet size | Full-sheet layout count (no offcut reuse) | Sheets to buy |
|---|---|---|
| 1220 × 2440 mm | 6 sheets | 5 sheets |
| 1200 × 2400 mm | 6 sheets | 5 sheets |
| 1250 × 2500 mm | 6 sheets | 5 sheets |
| 1525 × 1525 mm | 6 sheets | 6 sheets |
What to know about boarding a 4 × 3 m floor
- Either common size gives 5. A 2440 × 1220 mm sheet covers 2.98 m² and a 2400 × 1200 mm sheet 2.88 m², so 12 m² plus 10% works out at 4.43 or 4.58 sheets — both round to five.
- 2400 mm fits metric joists. Joists at 400 or 600 mm centres divide 2400 mm exactly (six or four spaces), so sheet ends land on a joist without trimming. A 2440 mm sheet needs about 40 mm cut off to do the same, which is where the extra waste goes.
- Narrow flooring boards count differently. Tongue-and-groove chipboard is also sold as 2400 × 600 mm boards; four of those make one 2400 × 1200 sheet, so multiply the sheet count by four.
- Thickness follows the joist spacing. 18 mm board is common on joists at 400 mm centres and 22 mm at 600 mm — check the board’s label for the spacing it is rated for.
Working in feet and inches instead? The same room is close to How many sheets of plywood for a 12x12 floor, and walls are covered in How many sheets to sheathe a 24 ft wall, 8 ft high.
Different size? Use the full Plywood Calculator.
What you’ll need
- Circular saw (7¼ in)Mid-range price
The most versatile first power saw: crosscuts framing lumber, rips boards and, with a straightedge, breaks down plywood sheets.
See options on Amazon (opens in a new tab) - Track sawPremium price
Rides on a rail for straight, splinter-free cuts in full sheets — a space-saving alternative to a table saw for plywood.
See options on Amazon (opens in a new tab) - 25 ft tape measureBudget price
A 25 ft tape with a stiff blade and a readable 1/16 in scale covers everything from cut lists to deck layout.
See options on Amazon (opens in a new tab)
As an Amazon Associate we earn from qualifying purchases. Links to products are affiliate links — they cost you nothing extra and help keep these calculators free.
Frequently asked questions
How many 2400 × 1200 mm sheets for a 4 × 3 m floor?
5 sheets with 10% waste — 4.58 before rounding, since each sheet covers 2.88 m².
How many 2440 × 1220 mm sheets for a 5 × 4 m floor?
8 sheets for 20 m² with 10% waste (7.39 before rounding).
How many full sheets does a 4 × 3 m floor take if offcuts can’t be reused?
6 sheets of 2440 × 1220 mm laid on a grid — one more than the area count, which is why offcuts that start the next row matter.
Other common sizes
Sources
- APA – The Engineered Wood Association, Panel Design Specification (Form D510) (opens in a new tab) — Design reference for structural plywood and OSB panels, including approximate panel weights: plywood about 2.3 lb per sq ft at 3/4 in and 1.5 at 1/2 in; OSB about 10% heavier.