Article — Land Area Converter
Land area converter: acre, hectare, sq ft, sq m
A land area converter switches between acres, hectares, square meters, square feet, square yards, square miles, square kilometers, and ares. The two most common conversions: 1 acre = 0.4047 hectares (4,046.86 m²), and 1 hectare = 2.4711 acres (10,000 m²). All factors below come from the 1959 international yard-and-pound treaty and are exact.
This converter handles the full range of land area scales — from a parking space (15 m²) to a large national park (10,000 km²) — in one tool. It is built for real estate buyers, farmers, surveyors, and anyone reading a property deed in unfamiliar units.
What is a land area converter?
A land area converter translates one measurement of two-dimensional surface into other common units of area. Area itself is a derived quantity — it is length squared. So all area unit conversions can be derived from the corresponding length conversions: if 1 ft = 0.3048 m, then 1 sq ft = (0.3048)² = 0.09290304 m². The factors flow down from the length definitions.
The converter on this page treats the square meter as the base unit and converts everything else through it. This avoids cumulative rounding error when chaining conversions (e.g., acres → sq ft → sq m).
The acre was originally defined as the amount of land one ploughman with one ox could plough in a day. By the 13th century the English statute acre was fixed at 1 chain × 1 furlong, or 66 ft × 660 ft = 43,560 sq ft. The number 43,560 has stuck for nearly 800 years.
Land area conversion formulas
The key conversions are simple multiplications. Working from common to exotic: 1 acre = 4,046.86 m²; 1 hectare = 10,000 m²; 1 sq ft = 0.0929 m²; 1 sq mi = 2.59 km²; 1 km² = 100 hectares; 1 are = 100 m². Going the other way: 1 m² = 10.764 sq ft; 1 hectare = 2.4711 acres; 1 km² = 247.105 acres.
For most real-estate work, only three units matter: acres (US), hectares (international), and square meters (metric universal). The four-way mental conversion: 1 acre ≈ 0.4 hectare = 4,047 m² = 43,560 sq ft. Memorising these four equivalences covers 80% of everyday cases.
Acre to hectare and back
The acre is the dominant land area unit in the US, the UK, and Commonwealth countries. The hectare is the international metric standard, used in EU agricultural policy and Asian property markets. Cross-converting is essential for any international land transaction or comparison.
The factor: 1 acre = 0.4046856 hectares. The reciprocal: 1 hectare = 2.4710539 acres. A 100-hectare farm is about 247 acres. A 1-acre US suburban estate is roughly 0.4 hectare. A 640-acre US "section" of the Public Land Survey System is exactly 259 hectares — also exactly 1 square mile.
Land area in real estate
US residential lots are quoted in acres or square feet. A "quarter-acre" lot is 10,890 sq ft (1,012 m²). A "half-acre" lot is 21,780 sq ft (2,023 m²). The "lot size" line on a US listing is the total parcel area — not the building footprint.
European listings use square meters for the building and hectares for the land. A French country house with "30 ares of garden" sits on 3,000 m² of land, or 0.74 acres. UK listings still use both acres and square meters; rural property is in acres, urban in m².
For US homebuyers, the quickest sanity check: divide square feet of lot by 43,560 to get acres. So 30,000 sq ft = 0.69 acres. For European buyers: divide square meters by 10,000 to get hectares, or by 4,047 to get acres.
Land area in agriculture
Agricultural land area uses hectares globally except in the US, Canada, and the UK, where acres dominate. The US average farm is 444 acres (180 hectares). The average EU farm is roughly 16 hectares (40 acres). Large Australian sheep stations exceed 1,000,000 acres (404,000 hectares).
Crop yields are conventionally reported per acre (US) or per hectare (international). A typical US corn yield is 180 bushels per acre; converting to metric, that is 11.3 tonnes per hectare. Wheat yields run 50–80 bushels per acre or 3.4–5.4 tonnes per hectare. The land area converter is essential for cross-system yield comparison.
Regional land area units
Several land area units survive only in specific regions but matter intensely there. The bigha (north and east India, Bangladesh, Nepal) ranges from 2,500 to 6,800 m² depending on state. The marla (Pakistan and Indian Punjab) is 272 sq ft or 25.29 m². The kanal (same region) is 20 marla, or 505 m². The Egyptian feddan is 4,200 m².
- Bigha (Bihar avg) = 2,529 m² (region-dependent, ranges 1,338–6,772 m²)
- Marla (Pakistan/Punjab) = 25.29 m² = 272.25 sq ft
- Kanal (Pakistan/Punjab) = 505.86 m² = 20 marla
- Feddan (Egypt) = 4,200.83 m² (close to 1 acre)
- Dunam (Levant) = 1,000 m² (1 metric dunam)
- Cuerda (Puerto Rico) = 3,930 m² (close to 1 acre)
- Manzana (Central America) = 7,000 m²
- Rai (Thailand) = 1,600 m²
Common land area conversion mistakes
The big error is forgetting that area scales as the square of length. Doubling the side of a square plot multiplies its area by four, not two. So a "twice as big" lot may actually have four times the area — the math gets very intuitive once you remember to square the length factor.
A second error is mixing nominal and surveyed area. A property listing might say "1 acre" but the surveyed area could be 0.94 acres or 1.07 acres — title-search documents often reveal differences. For purchase price negotiations, always use the surveyed value from the official cadastral record.
Until 2022, US surveying used a slightly different "US survey foot" (1200/3937 m) and therefore a slightly different "US survey acre" — about 0.0004% larger than the international acre. The discrepancy mattered for very large surveyed parcels. NOAA and the US government retired the survey foot in 2022; all new measurements use the international foot.
A short history of land area units
The acre traces to Anglo-Saxon farming: an "acer" was the land one team could plough in a day. The standard was fixed in 1305 under King Edward I. The hectare was invented in 1795 during the French metric reform — a clean 100 m × 100 m square that scaled with the new metric system. Both units now coexist by international agreement.
The square meter is the SI base for area, but the hectare and the are are explicitly accepted "non-SI units used with the SI" by the BIPM. They survive because they are convenient — a hectare is roughly the size of one rugby pitch, easy to visualise. National cadastres in Europe, Latin America, and most of Asia record holdings in hectares.