Quick answer: Area is the amount of two-dimensional space inside a shape, measured in square units. This calculator covers the common formulas: rectangle length times width, triangle half base times height, circle pi r squared, and trapezoid half the sum of parallel sides times height. Results convert between square meters, square feet, acres and hectares.
Last reviewed: September 2026
Key facts
- 1 acre = 4,046.86 m²; 1 hectare = 10,000 m² = 2.47105 acres.
- 1 ft² = 0.092903 m² — the number behind every property listing conversion.
- An American football field (with end zones) is about 1.32 acres.
- Area units are squared length units: 1 m² = 10.7639 ft².
Property listings, floor plans, farmland — area units switch between metric and imperial with no warning. This free area converter translates between square millimetres, square metres, hectares, square kilometres, square inches, square feet, square yards, acres and square miles instantly.
Enter a value and choose your units. Because area units are just squared length units, every conversion here is exact.
How to use
- Enter a value.
- Choose the from and to units.
- Read the answer and the full table of equivalents below.
How area conversion works
| Term | Meaning |
|---|---|
| from-unit in m² | Each unit’s exact definition in square metres. |
| to-unit in m² | The target unit’s definition in square metres. |
Area scales with the square of length: doubling each side of a room quadruples its floor area.
Worked examples
An acre in metric
1 acre → m²: 4,046.86 m².
1 hectare → acres: 10,000 ÷ 4,046.86 = 2.47105 acres.
Property and sport
100 m² flat → ft²: 100 ÷ 0.092903 = 1,076.39 ft².
FIFA pitch 105 × 68 m → acres: 7,140 ÷ 4,046.86 = 1.76 acres.
Area units in square metres
| Unit | Equals (m²) | Think of |
|---|---|---|
| Square centimetre (cm²) | 0.0001 | A postage stamp |
| Square metre (m²) | 1 | A large tabletop |
| Hectare (ha) | 10,000 | A rugby field |
| Square kilometre (km²) | 1,000,000 | A small town |
| Square inch (in²) | 0.00064516 | A coin |
| Square foot (ft²) | 0.092903 | A floor tile |
| Square yard (yd²) | 0.836127 | A washing machine footprint |
| Acre (ac) | 4,046.86 | 3/4 of a football field |
| Square mile (mi²) | 2,589,990 | A large district |
Frequently asked questions
How big is an acre?
4,046.86 m² — about 75% of an American football field including end zones, or roughly 16 tennis courts.
Acre vs hectare — which is bigger?
A hectare (10,000 m²) is about 2.47 acres. Hectares are metric; acres are imperial.
How do I convert square feet to square metres?
Multiply ft² by 0.092903 (or divide by 10.7639): 1,000 ft² ≈ 92.9 m².
Why is 1 m² = 10.7639 ft²?
Because 1 m = 3.28084 ft, and area squares the length factor: 3.28084² = 10.7639.
What is a square kilometre in square miles?
1 km² = 0.386102 mi²; conversely 1 mi² = 2.58999 km².
Sources
- NIST — SI units and conversion factors
- Khan Academy — Area formulas and geometry lessons
Key takeaways
Key takeaways
- 1 acre = 4,046.86 m²; 1 ha = 2.47105 acres; 1 ft² = 0.092903 m².
- Area factors are squared length factors — doubling sides quadruples area.
- A football field with end zones ≈ 1.32 acres: a handy mental benchmark.
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