Square Meter to Acre Conversion Calculator: Free Online Tool
Convert square meters to acres with our free online area converter.
Square Meter to Acre Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Square Meter).
- The converted value in Acre will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Area category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Square Meter to Acre
Converting Square Meter to Acre involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Square Meter = 0.000247105 acresExample Calculation:
Convert 10 square meters: 10 × 0.000247105 = 0.00247105 acres
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Square Meter and a Acre?
The Square Meter (symbol: m² or sq m) is the fundamental unit of area in the International System of Units (SI). It is defined as the area of a square whose sides measure exactly one meter (m) in length, the SI base unit for length.
Mathematically: 1 m² = 1 meter × 1 meter
It forms the basis for other metric area units using SI prefixes:
- 1 square kilometer (km²) = 1,000,000 m²
- 1 hectare (ha) = 10,000 m²
- 1 square centimeter (cm²) = 0.0001 m² (or 1 m² = 10,000 cm²)
- 1 square millimeter (mm²) = 0.000001 m² (or 1 m² = 1,000,000 mm²)
In terms of imperial/US customary units:
- 1 m² ≈ 10.764 square feet (ft²)
- 1 m² ≈ 1.196 square yards (yd²)
- 1 m² ≈ 0.000247 acres (ac)
The acre (symbol: ac) is a unit of land area used in the imperial and US customary systems. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet). This is exactly equal to:
- 10 square chains
- 1/640 of a square mile
- 4,840 square yards
- 43,560 square feet
- Approximately 4,046.856 square meters (m²)
- Approximately 0.4047 hectares (ha)
While derived from traditional farming practices, its size is now legally defined based on the international yard.
Note: The Square Meter is part of the metric (SI) system, primarily used globally in science and trade. The Acre belongs to the imperial/US customary system.
History of the Square Meter and Acre
- Origin (The Meter): The square meter is derived directly from the meter. The meter was first defined during the French Revolution in the 1790s, initially as one ten-millionth of the distance from the North Pole to the Equator along the meridian passing through Paris.
- Metric System Development: As the metric system was developed and refined, the square meter emerged as the logical and coherent unit for area, based on the fundamental unit of length.
- Treaty of the Metre (1875): This international treaty established the General Conference on Weights and Measures (CGPM), the International Bureau of Weights and Measures (BIPM), and the International Committee for Weights and Measures (CIPM) to maintain and standardize the metric system, solidifying the role of the meter and its derived units.
- SI Establishment (1960): The 11th CGPM formally established the International System of Units (SI), designating the meter as one of the seven base units and confirming the square meter as the derived unit for area.
- Redefinition of the Meter (1983, 2019): The definition of the meter itself has been refined over time for greater precision, now being based on the speed of light, a fundamental constant of nature. This precision underpins the definition of the square meter.
- Origin: The word "acre" derives from the Old English word æcer (originally meaning "open field"), cognate with German Acker and Latin ager. It traditionally represented the amount of land that could be ploughed by one man with one yoke of oxen in one day. This practical definition naturally led to considerable variation in its size depending on the land quality and local customs.
- Medieval Variations: Throughout the Middle Ages in England, the acre's size varied. Different regions used "customary acres" based on local practices, often related to the quality of the land or the length of a standard furrow (furlong).
- Standardization (Gunter's Chain): The standardization of the acre is closely linked to the invention of Gunter's chain in 1620. This measuring chain, 66 feet long (divided into 100 links), became a standard survey tool. The traditional definition of an acre as a strip of land one furlong (10 chains or 660 feet) long and one chain (66 feet) wide was easily measured using the chain. This area is precisely 10 square chains.
- Statutory Acre: In England and Wales, the Weights and Measures Act of 1878 formalized the "statutory acre" based on the imperial yard, solidifying the definition as 4,840 square yards (or 43,560 square feet). This is the acre commonly used today in the UK, US, and Commonwealth countries.
- Metrication: Although many countries using the acre have largely adopted the metric system for other measurements, the acre persists strongly in land transactions and agriculture due to historical precedent and cultural familiarity. The hectare (10,000 m²) is the more common metric unit for land.
Common Uses for square meters and acres
Explore the typical applications for both Square Meter (metric) and Acre (imperial/US) to understand their common contexts.
Common Uses for square meters
The square meter is the globally recognized standard for area and is used extensively across countless fields:
- Real Estate and Construction: The primary unit for specifying floor area of buildings, room sizes, and land parcel sizes (especially smaller plots) in nearly all countries using the metric system.
- Science and Engineering: Ubiquitous in physics (e.g., pressure (Pascal = N/m²), intensity), chemistry (surface area calculations), material science, and all engineering disciplines for surface area, cross-sectional area, and related calculations.
- Manufacturing: Measuring the area of sheet materials like textiles, paper, metal sheeting, plastics, and glass.
- Retail (Flooring, Fabric, etc.): Used for selling materials priced by area, such as carpets, tiles, vinyl flooring, and fabrics.
- Agriculture and Forestry: While hectares are common for larger land areas, square meters can be used for smaller plots, experimental fields, or precise measurements.
- Gardening and Landscaping: Calculating areas for lawns, garden beds, patios, or amounts of materials needed (e.g., topsoil, mulch).
- Environmental Monitoring: Measuring sampling areas or specific zones.
- Mapping and Surveying: Used for precise area calculations on maps and plans, especially at local scales.
Common Uses for acres
The acre remains a primary unit for land measurement in several countries, particularly within specific sectors:
- Real Estate (US, UK, Commonwealth): Standard unit for describing the size of land parcels in property listings, deeds, and surveys, especially for residential lots larger than typical city plots, rural properties, and undeveloped land.
- Agriculture: Widely used by farmers to measure field sizes, calculate crop yields, allocate resources (like fertilizer or seeds), and comply with agricultural regulations.
- Land Management and Planning: Used in zoning regulations, environmental assessments, and land development projects to specify area requirements or limitations.
- Historical Documents: Understanding the acre is crucial for interpreting historical land records, surveys, and deeds.
- Informal Comparisons: Often used informally to help visualize the size of large areas, even where metric units are officially standard.
Frequently Asked Questions
Questions About Square Meter (m²)
Is the square meter the base SI unit for area?
Yes, the square meter (m²) is the SI derived unit for area. It is derived from the SI base unit of length, the meter (m).
How big is a square meter visually?
It's the area of a square with sides exactly one meter long. You can visualize it as roughly the area covered by:
- A very large bath towel.
- A small dining table for two people.
- About half the surface of a standard single door.
How do you convert square meters to square feet?
To convert square meters to square feet, multiply the area in square meters by approximately 10.764.
- Conversion formula: Area [ft²] ≈ Area [m²] × 10.764
- Example: 50 m² ≈ 50 × 10.764 ft² ≈ 538.2 ft²
Are square meters used in the United States?
While the US primarily uses the US customary system (square feet, square yards, acres) for everyday purposes like real estate and construction, the square meter is widely used in the US in:
- Science and Engineering: It's the standard in these fields.
- Manufacturing: Especially for companies involved in international trade.
- Government: Many government specifications and projects use metric units.
- Medicine: Used in various medical calculations.
What's the difference between a meter and a square meter?
A meter (m) is a unit of length or distance (one dimension). A square meter (m²) is a unit of area (two dimensions), representing the space enclosed within a square that has one-meter sides.
About Acre (acre)
How big is an acre visually?
An acre is 43,560 square feet. While it can be any shape, a square acre would be about 208.71 feet on each side. A common visual comparison is an American football field: one acre is about 90.75% of the total area of a standard American football field (which is 120 yards long by 53.33 yards wide, or 57,600 sq ft including end zones). Excluding the end zones (100 yards by 53.33 yards, or 48,000 sq ft), an acre is about 90.75% of the playing field area.
How many square feet are in an acre?
There are exactly 43,560 square feet in one acre. This definition (1 furlong × 1 chain = 660 ft × 66 ft) is precise.
How many square yards are in an acre?
There are exactly 4,840 square yards in one acre (since 1 yard = 3 feet, 1 square yard = 9 square feet; 43,560 / 9 = 4,840).
How many acres are in a square mile?
There are exactly 640 acres in one square mile.
How many acres are in a hectare?
One hectare is equal to 10,000 square meters. Since one acre is approximately 4,046.856 square meters, one hectare contains approximately 2.471 acres (10,000 / 4046.856 ≈ 2.471). Conversely, one acre is approximately 0.4047 hectares.
Is the acre an SI unit?
No, the acre is not part of the International System of Units (SI). It belongs to the imperial and US customary systems. The SI unit for area is the square meter (m²). For land measurement, the hectare (ha), equal to 10,000 m², is commonly used in metric contexts and is accepted for use with SI.
Conversion Table: Square Meter to Acre
| Square Meter (m²) | Acre (acre) |
|---|---|
| 1 | 0 |
| 5 | 0.001 |
| 10 | 0.003 |
| 25 | 0.006 |
| 50 | 0.012 |
| 100 | 0.025 |
| 500 | 0.124 |
| 1,000 | 0.247 |