Area Converter
Convert between square millimeters, square centimeters, square meters, square kilometers, square inches, square feet, square yards, square miles, acres, and hectares. All conversions update instantly.
| Unit | Value |
|---|---|
| Square Millimeter (mm²) | 92903040 |
| Square Centimeter (cm²) | 929030.4 |
| Square Meter (m²) | 92.90304 |
| Square Kilometer (km²) | 0.000093 |
| Square Inch (in²) | 144000 |
| Square Foot (ft²) | 1000 |
| Square Yard (yd²) | 111.111111 |
| Square Mile (mi²) | 0.000036 |
| Acre (ac) | 0.022957 |
| Hectare (ha) | 0.00929 |
Common Area Conversions
| Convert from | Convert to | Multiply by | Example |
|---|---|---|---|
| Square feet (ft²) | Square meters (m²) | 0.092903 | 1,000 ft² = 92.9 m² |
| Square meters (m²) | Square feet (ft²) | 10.7639 | 100 m² = 1,076 ft² |
| Acres (ac) | Hectares (ha) | 0.404686 | 10 ac = 4.05 ha |
| Hectares (ha) | Acres (ac) | 2.47105 | 5 ha = 12.36 ac |
| Square miles (mi²) | Square km (km²) | 2.58999 | 1 mi² = 2.59 km² |
| Square km (km²) | Square miles (mi²) | 0.386102 | 10 km² = 3.86 mi² |
| Acres (ac) | Square feet (ft²) | 43,560 | 2 ac = 87,120 ft² |
| Square feet (ft²) | Acres (ac) | 0.0000229568 | 43,560 ft² = 1 ac |
| Square yards (yd²) | Square meters (m²) | 0.836127 | 100 yd² = 83.6 m² |
| Square meters (m²) | Square yards (yd²) | 1.19599 | 100 m² = 119.6 yd² |
What Is Area?
Area is the measure of a two-dimensional surface — the amount of space enclosed within a boundary. Unlike length, which has one dimension, area is always expressed in squared units because it represents length multiplied by length. A room measuring 10 meters by 8 meters has an area of 80 square meters (m²). The concept applies whether you are measuring a floor plan, a field, a country, or a computer chip.
Area is one of the most practically important measurements in everyday life. It governs how much paint you need for a wall, how much carpet for a room, how much fertiliser for a lawn, how much land a property contains, and how much space a solar panel array will occupy. Getting area conversions right — especially between metric and imperial units — is essential for construction, agriculture, real estate, and engineering.
Area Units: Metric System
The metric system builds area units by squaring length units. The SI base unit of area is the square meter (m²). From there, the system scales by factors of 10² (100) for each step:
- Square millimeter (mm²): 0.000001 m². Used for very small surfaces — cross-sections of wire, chip dimensions.
- Square centimeter (cm²): 0.0001 m². Common in chemistry (reaction surfaces), medicine (skin areas), everyday objects.
- Square meter (m²): The base unit. Used for room areas, apartment sizes, building footprints.
- Hectare (ha): 10,000 m². The standard agricultural and land measurement unit worldwide.
- Square kilometer (km²): 1,000,000 m². Used for geographic areas — cities, countries, bodies of water.
The hectare is technically not an SI unit but is officially recognised by the International Bureau of Weights and Measures (BIPM) for use alongside SI. It fills the practical gap between square meters (too small for land) and square kilometers (too large for individual parcels).
Area Units: Imperial and US Customary System
The imperial system uses units based on feet and yards for smaller areas, and acres and square miles for land:
- Square inch (in²): 0.00064516 m². Used for small objects, paper sizes, screen dimensions.
- Square foot (ft²): 0.09290304 m². The primary unit for room and building floor area in the US.
- Square yard (yd²): 0.83612736 m². Common in US carpeting and fabric sales.
- Acre (ac): 4,046.856 m² (43,560 ft²). The main land measurement unit in the US and UK.
- Square mile (mi²): 2,589,988 m². Used for large geographic areas in the US.
All imperial-to-metric conversions for area derive from the linear conversion: 1 inch = 2.54 cm (exact). Since area is length squared, the conversion factors for area are the squares of the linear factors. For example, 1 foot = 0.3048 m, so 1 ft² = 0.3048² = 0.09290304 m² (exact).
How Area Conversion Works
This converter uses a base-unit method. Every unit has a factor representing how many square meters it equals. To convert from unit A to unit B:
Result = Input × (FactorA / FactorB)
For example, to convert 5 acres to hectares: factor for acres = 4,046.856, factor for hectares = 10,000. Result = 5 × (4,046.856 / 10,000) = 5 × 0.4047 = 2.023 hectares.
Real-World Size References
Area measurements become meaningful when anchored to familiar objects and places:
- Postage stamp: about 6 cm² (600 mm²)
- Sheet of A4 paper: 623.7 cm² (0.0624 m²)
- Typical bedroom: 12–16 m² (130–170 ft²)
- Tennis court (singles): 195.6 m² (2,106 ft²)
- Basketball court: 420 m² (4,520 ft²)
- American football field (including end zones): 6,400 m² (68,854 ft², about 1.6 acres)
- Standard soccer pitch: ~7,140 m² (76,840 ft², about 0.714 ha)
- City block (Manhattan): roughly 2 ha (5 acres)
- Central Park, New York: 341 ha (843 acres, 3.41 km²)
- London (Greater London): 1,572 km² (607 mi²)
- Texas: 696,241 km² (268,820 mi², about 172 million acres)
- Australia: 7,692,024 km²
Metric vs. Imperial: Which to Use?
The choice between metric and imperial area units is largely determined by geography and context:
- United States: Residential real estate is measured in square feet. Land is sold in acres. Geographic areas use square miles. Scientific and engineering work uses metric.
- United Kingdom: Property floor area uses square feet in advertising but square meters in official documents. Agricultural land uses acres in practice but hectares in official statistics.
- Europe, Asia, Australia, Latin America: Square meters for property and buildings; hectares for agricultural land; square kilometers for geographic areas.
- India: Uses square feet for urban property, but also traditional units such as gunta, biswa, bigha, and marla that vary by state — alongside the metric system in official records.
For international communication — particularly in real estate listings, agricultural reports, or environmental assessments — it is good practice to include both metric and imperial values. Most professional documents follow ISO 80000-3, which mandates SI units with imperial values as supplementary notation where necessary.
Land Measurement Around the World
Different cultures have developed their own area units that persist in local usage even where the metric system is officially mandated:
- Bigha (India): Varies by state — roughly 1,000–3,000 m² depending on region.
- Kattha (India/Bangladesh/Nepal): Also varies; typically 66.9–126 m².
- Mu (China): 1/15 of a hectare = 666.67 m².
- Pyong (Korea/Japan): About 3.306 m² — still used in Korean real estate.
- Tsubo (Japan): Same as pyong, 3.306 m² — traditional Japanese unit.
- Dunam (Middle East): 1,000 m² — used in Turkey, Israel, Jordan, and Palestine for agricultural land.
- Feddan (Egypt/Sudan): 4,200.8 m² ≈ just over 1 acre.
When dealing with international property transactions or land records, always confirm which unit system the local documents use and verify any traditional units against the metric equivalent in that specific region.
Frequently Asked Questions
How many square feet are in an acre?
One acre equals exactly 43,560 square feet. This figure derives from the historical definition of an acre as the area a team of oxen could plough in a single day — originally measured as a furlong (660 feet) by a chain (66 feet), which gives 660 × 66 = 43,560. To convert acres to square feet, multiply by 43,560. To go the other way, divide square feet by 43,560. For quick mental math: half an acre ≈ 21,780 sq ft, a quarter acre ≈ 10,890 sq ft. A typical US residential lot is around 8,000–10,000 sq ft, so slightly under a quarter acre.
How do I convert square feet to square meters?
One square foot equals exactly 0.09290304 square meters, because 1 foot = 0.3048 m and area scales as the square of the linear unit: 0.3048² = 0.09290304. To convert square feet to square meters, multiply by 0.09290304 (or divide by 10.764). To convert square meters to square feet, multiply by 10.7639. Example: a 1,500 sq ft apartment is 1,500 × 0.09290304 ≈ 139.4 square meters. A 100 m² apartment is 100 × 10.764 ≈ 1,076 square feet. The factor 10.764 is worth memorising if you deal with international real estate listings.
What is a hectare and how big is it?
A hectare (ha) is a metric unit of area equal to 10,000 square meters — a square 100 meters on each side. The prefix "hecto" means 100, so one hectare = 100 ares, where one are = 100 m². Hectares are the standard land measurement unit across most of the world for agriculture and forestry. In practical terms: one hectare ≈ 2.471 acres. A standard football pitch (soccer field) is roughly 0.7 hectares (about 105 m × 68 m = 7,140 m²). An average city block in Manhattan is about 2 hectares. One square kilometer = 100 hectares. The hectare is not an SI unit but is accepted for use with SI.
How many acres are in a square mile?
There are exactly 640 acres in one square mile. This is because one mile = 5,280 feet, so one square mile = 5,280² = 27,878,400 square feet. Dividing by 43,560 square feet per acre gives exactly 640. This relationship is the foundation of the US Public Land Survey System (PLSS), which divided land into 6-mile-by-6-mile townships (36 square miles = 23,040 acres), then sections of 1 square mile (640 acres), then quarter-sections of 160 acres — the size of a homestead claim under the 1862 Homestead Act. In metric: 1 square mile = 258.999 hectares ≈ 259 hectares.
What is the difference between square meters and meters squared?
The terms "square meters" and "meters squared" refer to the same unit of area — m² — and are used interchangeably in everyday language. The distinction matters only in dimensional analysis: "meters squared" emphasises that the unit was derived by squaring the meter (m × m = m²), which is useful when tracking units through a calculation. "Square meters" is simply the name of the area unit. There is no numerical difference: 50 square meters and 50 meters squared both mean 50 m². By contrast, "squared meters" could ambiguously suggest something different, so the standard phrasing in technical writing is "square meters" or the symbol m².
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