Compute total area of flat sheets from length, width, and count in m² or ft².
Presets
Input
Details
Conversion formulas and unit factors
Length unit → meters: 1 m = 1 m · 1 cm = 0.01 m · 1 mm = 0.001 m · 1 ft = 0.3048 m · 1 in = 0.0254 m.
Area conversions: 1 m² = 10.7639 ft² = 1.19599 yd² = 1,550.0031 in². 1 ft² = 0.092903 m² = 144 in². 1 yd² = 9 ft² = 0.836127 m².
Computation: Convert L and W to meters, multiply for m². Multiply m² by unit factors for ft², yd², in². Total = single-sheet area × N.
Typical sheet sizes for common materials
Drywall / gypsum board (US): 4 ft × 8 ft (1219 × 2438 mm), 4 ft × 10 ft, 4 ft × 12 ft. EU drywall: 1200 × 2500 mm, 1200 × 2700 mm, 1200 × 3000 mm.
Plywood / OSB: 4 ft × 8 ft standard; metric 1220 × 2440 mm, 1250 × 2500 mm.
Flooring underlayment / hardboard: 4 × 8 ft or 1200 × 2400 mm.
Metal roofing panels: width 26–36 in (660–914 mm); length cut to order 6–20 ft typical.
Paper: A4 = 210 × 297 mm, US Letter = 8.5 × 11 in, A3 = 297 × 420 mm.
Quick reference: 4 × 8 ft sheets
| Sheets | Total ft² | Total m² |
|---|---|---|
| 1 | 32.00 | 2.97 |
| 5 | 160.00 | 14.86 |
| 10 | 320.00 | 29.73 |
| 20 | 640.00 | 59.46 |
| 50 | 1,600.00 | 148.64 |
| 100 | 3,200.00 | 297.29 |
FAQ
What are standard sheet sizes for drywall and plywood?
In North America, the dominant size is 4 ft × 8 ft (32 ft² ≈ 2.97 m²) for both drywall and plywood, with longer 4 × 10 and 4 × 12 options for tall walls. Europe uses metric 1200 × 2500 mm (3.00 m² ≈ 32.29 ft²) and 1200 × 3000 mm. Specialty panels such as plaster-fibre boards and cement boards often follow the same widths with varied lengths.
How do I convert m² to ft² and yd²?
Multiply square meters by 10.7639 to get square feet, and divide by 0.8361 (or multiply by 1.19599) for square yards. Example: a 29.73 m² total becomes 29.73 × 10.7639 = 320.00 ft² and 29.73 × 1.19599 = 35.56 yd². Use the calculator above to get all three units at once without manual conversion.
How many sheets cover a given wall or floor area?
Divide the surface area you need to cover by the single-sheet area, then round up and add 7–10% for cuts and waste. Example: a 96 ft² wall using 4 × 8 ft (32 ft²) drywall needs 96 / 32 = 3 sheets, plus one extra for trimming — order 4. The calculator's "area per sheet" row gives the divisor directly in m² or ft².
Why does the calculator show both m² and ft²?
Construction materials are sold in metric in most countries and imperial in the US/Canada. A contractor ordering A4 paper reams or EU drywall works in m², while a roofer estimating shingles or plywood panels needs ft². Seeing both removes a manual conversion step and reduces the chance of an ordering error on mixed-unit projects.
How do I estimate total area for a mixed stack of sheet sizes?
Compute each size separately and sum the totals. Run the calculator once for 4 × 8 ft plywood × 12 sheets (384 ft²), once for 4 × 10 ft × 5 sheets (200 ft²), then add: 584 ft² total. Perimeter is per-sheet only, so it does not add up across different sizes — treat it as cut/edge length per panel for trim or tape estimates.
Calculate the area of rectangular sheets — drywall, plywood, OSB, metal roofing panels, paper — in square meters and square feet. Enter sheet length and width in any unit (m, cm, mm, ft, in) plus the number of sheets; the tool returns area per sheet, total area across all sheets in m², ft², yd², in², and perimeter per panel. Useful for ordering material, estimating coverage, and reconciling metric/imperial specs on mixed-unit projects. Examples: ten 4 × 8 ft drywall sheets give 320 ft² (29.73 m²) total, eight 1200 × 2500 mm EU drywall panels cover 24 m², a ream of 500 A4 sheets equals about 31.19 m².