Square Metres Calculator
Calculate area from dimensions and convert between square metres, square feet, acres, hectares, and other area units. Essential for flooring, tiling, and land measurement.
Area Calculations for Construction
Common Area Formulas
Rectangle: Area = length × width
Triangle: Area = ½ × base × height
Circle: Area = π × radius²
Trapezoid: Area = ½ × (a + b) × height
Sector: Area = (θ ÷ 360) × π × radius²
Common Area Conversions
| Metric | Imperial | Use Case |
|---|---|---|
| 1 m² | 10.76 ft² | Room sizes |
| 10 m² | 107.6 ft² | Small rooms |
| 1 hectare | 2.47 acres | Land plots |
| 1 km² | 247 acres / 0.39 mi² | Large sites |
Material Coverage Examples
- Flooring Packs: A pack of laminate covering 2.5m² will need 10 packs for a 25m² room (plus 10% wastage = 11 packs)
- Tiles: 60cm × 60cm tiles (0.36m² each) - need 70 tiles for 25m² (including wastage)
- Carpet: Sold by linear metre (4m width) - 25m² room needs 6.25 linear metres
- Paint: 1 litre covers ~12m² - 25m² room needs 2-3 litres for two coats
Square Metre Pricing
Comparing prices per square metre helps ensure you're getting the best value:
| Product | Pack Size | Price | £/m² |
|---|---|---|---|
| Laminate A | 2.0 m² | £24 | £12.00 |
| Laminate B | 2.5 m² | £30 | £12.00 |
| Laminate C | 2.0 m² | £22 | £11.00 |
Wastage Allowance
Always add wastage to your area calculations:
- Standard rooms: Add 5-10%
- Complex shapes: Add 10-15%
- Diagonal installation: Add 15%
- Pattern matching: Add 10-20%
- Natural stone: Add 15-20%
UKUK Building Regulations
References & Sources
Standards Cited
- SI Brochure (9th edition) — The International System of Units
Defines the metre as the SI base unit of length, from which square metre (m²) is derived as the SI unit of area View → - NIST Handbook 44 — Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices
Provides authoritative conversion factors between imperial and metric area units (e.g., 1 ft² = 0.092903 m²) View →
Formulas Used
- Rectangle Area:
A = length x width
Source: Standard geometry - Triangle Area:
A = 0.5 x base x height
Source: Standard geometry - Circle Area:
A = pi x r²
Source: Standard geometry - Trapezoid Area:
A = 0.5 x (a + b) x h
Source: Standard geometry - Sector Area:
A = (angle / 360) x pi x r²
Source: Standard geometry - Wastage Allowance:
Total = Area x (1 + wastage% / 100)
Source: Industry standard practice — Default 10% wastage for flooring/packaging - Area Unit Conversion:
result = value x (fromFactor / toFactor)
Source: NIST Handbook 44 — Conversion via square metres as the intermediate base unit
Key Assumptions
- 1 ft² = 0.092903 m² (exact NIST conversion factor) — NIST Handbook 44
- 1 acre = 4046.86 m² — NIST Handbook 44
- Default wastage of 10% is applied for flooring pack calculations — Industry standard practice