Oppervlakte Converter — Converteer Tussen Alle Oppervlakte-eenheden

An area converter translates measurements of two-dimensional surface area between the full range of units used globally — from square millimeters for tiny surfaces to square kilometers and square miles for geographic regions, including agricultural units (acres, hectares) and the full range of metric SI prefixed units. Enter a value in any unit and instantly see the equivalent in every other unit, making cross-system area comparisons simple and precise.

Area measurement is at the heart of real estate, agriculture, urban planning, architecture, and geographic analysis. The challenge is that different industries, countries, and historical traditions have established incompatible unit systems. A U.S. farmland sale is described in acres; the same land parcel in a UN agricultural report becomes hectares; an international investor reading about the property might think in square meters or square kilometers. A floor plan in the United States gives square footage; the same apartment listed in Germany or France gives square meters. This constant cross-system translation is a practical daily need in any field that deals with area measurement internationally.

The divergence between the U.S. customary system and the metric system is particularly stark for area: the acre has no metric equivalent and derives from a medieval agricultural concept (the amount of land a yoke of oxen could plow in one day), while the hectare is a clean metric unit equal to exactly 10,000 square meters. Neither maps neatly onto the other, making precise calculation essential rather than approximation. This converter provides exact conversion factors derived from the internationally defined foot (0.3048 meters) for all imperial units, ensuring results accurate to any practical precision requirement.

Example 1 — Real estate: apartment in Europe vs. U.S. An 85 m² apartment listed in Paris. 85 × 10.7639 = 914.9 sq ft Equivalent: a 915 sq ft apartment in New York listings.

Example 2 — Agricultural land sale: 340 acres farmland in Iowa. 340 × 0.404686 = 137.6 hectares 340 × 4,046.86 = 1,375,932 m² 340 × 0.53125 sq miles ≈ 0.531 sq miles

Example 3 — Urban planning: City park planned at 12 hectares. 12 × 2.47105 = 29.65 acres 12 × 10,000 = 120,000 m² 12 × 0.01 km² = 0.12 km²

Example 4 — Country comparison: Belgium: 30,528 km² | Netherlands: 41,543 km² 30,528 km² = 11,782 sq miles = 7,540,544 acres = 3,052,800 hectares

Area conversion mistakes in real estate have cost buyers and sellers significant amounts of money. The most common confusion is between square meters and square feet — a factor of approximately 10.76 that, when missed, can make a 90 m² apartment appear to be approximately 90 square feet (a tiny room) or a 1,000 square foot house appear to be 1,000 m² (a palatial estate). International property portals that display listings from multiple countries must convert all listings to the buyer's local unit — errors in this conversion have been documented in cross-border property transactions.

In agriculture, the acre-to-hectare conversion is the divide between U.S. and international commodity markets. USDA crop production reports use acres; FAO statistics use hectares; farm equipment specifications may use either. A farmer purchasing equipment rated for a specific per-hectare application rate must correctly convert their acreage before calibrating — incorrect conversion affects fertilizer and pesticide application quantities directly, with crop yield and environmental compliance consequences.

For urban planners, architects, and construction managers, area is the fundamental unit of cost estimation. Building cost is typically quoted per square meter or per square foot — converting between these directly converts cost estimates. A contractor quoting $150 per square foot for construction in the U.S. would quote approximately $1,615 per square meter in metric terms. Project managers working across systems need these conversions accurate to avoid budget errors.

This converter handles the standard area units used in real estate, agriculture, and geography. It does not include some specialized or historical units that may appear in older legal documents or specific regional contexts: the rood (1/4 acre = 1,011.7 m²), the perch or square rod (1/160 acre = 25.29 m²), or the township (36 square miles = 23,310 hectares) used in U.S. public land survey descriptions. Property deeds in the U.S. recorded before the 20th century may use chains, rods, or links that require specialized survey unit converters.

The converter also does not handle some Asian regional units: the Japanese tsubo (≈3.306 m²) and tsubo-based units like the ken, cho, and tan; the Chinese mu (≈666.7 m²) and its subdivisions; the Indian bigha (which varies from state to state — 0.165 hectares in Punjab to 0.67 hectares in West Bengal, making direct comparison impossible without knowing the regional variant). For these units, always verify the specific local definition before converting.

For geographic comparisons, note that 'area' of countries and water bodies is measured at the surface and does not account for topographic relief. A mountainous country measured as 83,879 km² (Austria, for example) would have a larger actual surface area if measured along the terrain rather than projected on a flat plane. This projection effect is relevant for precision land surveys but not for the comparisons this tool supports.