How many acres are in a square kilometer?

One square kilometer equals approximately 247.105 acres. Conversely, 1 acre = 0.004047 km². A square kilometer also equals 100 hectares. This conversion is commonly used in forest area reports, national park measurements and large agricultural holdings.

Area Converter

m² · km² · ft² · acres · hectares · bigha · cent · ground · guntha · marla

Convert area units instantly — square meters, acres, hectares, square feet and all major Indian land measurement units including bigha, cent, ground, guntha and marla. Essential for real estate agents, agricultural planners and property buyers across India and internationally.

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1 acre = 4,047 m² | 1 ha = 10,000 m² | 1 m² = 10.764 ft² | 1 cent = 435.6 ft²

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Reference Table — 1 Acre equals

Symbol	Unit	Value	Real-world context

Formula:

About Area Units

Area measurement sits at the intersection of global real estate, agriculture and scientific standards — and no other quantity has as many competing regional systems still in active everyday use. From the square metre (the SI standard) to the acre (the Anglo-American land measure), the hectare (the international agricultural standard) and a diverse set of Indian subcontinent units — cent, ground, guntha, bigha, marla — each unit has a specific professional and regional context where it dominates. This converter covers all 15 units used in practice.

🌍 International Units — m², km², hectare, acre

The square metre (m²) is the SI base unit of area, used universally in science, construction blueprints and official government land records worldwide. The hectare (1 ha = 10,000 m²) was adopted as the standard agricultural unit under the metric system and is used by governments, UN FAO and international agricultural organisations. The acre (4,046.86 m² = 43,560 ft²) remains the dominant land unit in the US, UK and countries with British colonial heritage — property sales, crop land and national park areas are commonly quoted in acres. The square kilometre (1 km² = 100 ha = 247.1 acres) is used for large areas — countries, cities, forests.

🏡 Indian Land Units — Cent, Ground, Guntha, Bigha, Marla

India's diverse regional land measurement system means that the unit you see in a property listing depends entirely on the state. The cent (= 1/100 acre = 40.47 m²) is the primary residential plot unit in Tamil Nadu, Kerala and Andhra Pradesh. The ground (= 2,400 ft² = 222.97 m²) dominates Chennai real estate. The guntha/gunta (= 1,089 ft² = 101.17 m²) is common in Maharashtra and Karnataka. Bigha varies dramatically by state — from ~1,338 m² in West Bengal to ~2,529 m² in Rajasthan. Marla (= 272.25 ft² = 25.29 m²) is widely used in Punjab, Haryana and Pakistan for residential plots.

Why bigha varies by state: Unlike globally standardised units, bigha is a traditional unit that was never formally unified across India. Each state's revenue department uses its own historical definition, making bigha arguably the most confusing unit in property transactions. Always verify which state's bigha is being used when comparing land listings — a UP bigha (2,508 m²) is nearly twice the size of a West Bengal bigha (1,338 m²).

Quick Area Conversions

1 acre → m²

1 acre = 4,046.86 m²

1 hectare → acres

1 ha = 2.471 acres

1 m² → ft²

1 m² = 10.764 ft²

1 ft² → m²

1 ft² = 0.0929 m²

1 cent → m²

1 cent = 40.47 m² (435.6 ft²)

1 ground → ft²

1 ground = 2,400 ft² (222.97 m²)

1 bigha → m² (UP)

1 bigha = 2,508 m² (UP / Rajasthan)

1 km² → acres

1 km² = 247.1 acres

1 mi² → km²

1 mi² = 2.59 km² (640 acres)

1 guntha → m²

1 guntha = 101.17 m² (1,089 ft²)

Worked Examples

Chennai Residential Plot

3 grounds × 222.97 = 668.9 m²
668.9 m² × 10.764 = 7,200 ft²

A 3-ground plot in Chennai equals 668.9 m² or 7,200 sq ft. At ₹12,000/sq ft, this plot would be priced at ₹8.64 crore. Ground is the standard unit in Chennai real estate listings.

Agricultural Land (India)

5 acres × 4046.86 = 20,234 m²
20,234 m² ÷ 10,000 = 2.023 ha

A 5-acre farm equals 20,234 m² or 2.023 hectares. Government agricultural records use hectares, while local transactions use acres — this conversion appears in every land sale deed in rural India.

Global Office Space

5,000 ft² × 0.0929 = 464.5 m²

A US office lease quoted at 5,000 sq ft equals 464.5 m². Indian and European tenants regularly need this conversion when comparing international office specifications. 1,000 sq ft ≈ 93 m² is a useful anchor point.

Tamil Nadu Land Purchase

30 cents × 40.47 = 1,214 m²
30 cents × 435.6 = 13,068 ft²

A 30-cent plot in Tamil Nadu = 1,214 m² (≈13,068 sq ft). Since 100 cents = 1 acre, this is 0.3 acres. Cent is the dominant unit for residential plots in Tamil Nadu, Kerala and parts of Andhra Pradesh.

Explore All Area Conversions

m² → ft² ft² → m² acres → m² ha → acres acres → ha km² → mi² mi² → km² cent → m² ground → m² bigha → acres guntha → m² marla → m² ha → m² km² → ha acres → ft² ft² → acres

Who Uses an Area Converter?

🏠

Real Estate Agents & Buyers

Convert between the unit used in a property listing (cent, ground, bigha) and the unit the buyer understands (sq ft, m²). Essential for pan-India property portals listing properties across states with different local units.

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Farmers & Agricultural Planners

Convert between acres (used in farm transactions and crop insurance policies), hectares (used in official government records) and local units (bigha, guntha) to reconcile local usage with official documentation.

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Architects & Civil Engineers

Convert site area between sq ft (client-facing and local building regulations) and m² (structural calculations, international norms and BIM software inputs) for planning, permitting and construction drawings.

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Lawyers & Property Advocates

Verify land area across different documents — sale deeds may state area in cents, government survey records in hectares, and registered plans in m². Converting between all three for accuracy in legal documents is a daily need.

🌍

NRIs & International Buyers

NRIs accustomed to sq ft (US/UK) comparing Indian property listings in cents, grounds or bigha need quick conversion to familiar units to assess plot sizes and price per sq ft for investment decisions.

📊

Data Analysts & GIS Professionals

Convert geographic area data between km², ha, acres and m² when working with land use maps, satellite imagery analysis, forest coverage reports and national statistical datasets across different source standards.

Mental Math Tips — Area

m² → ft²

Multiply by 10.764 — or use the shortcut ×10.75. For 500 m²: 500 × 10.75 = 5,375 ft² (actual: 5,382). Reverse: divide ft² by 10.764 to get m². For 2,400 ft² (1 ground): 2,400 ÷ 10.764 = 223 m².

acres → m²

Multiply by 4,047. Quick check: 1 acre ≈ 4,000 m² (rough), ≈ 40 × 100 m plot. For hectares: 1 ha = 2.47 acres — or "2.5 acres per hectare" as a fast approximation (5% high). 100 cents = 1 acre = 40.47 × 100 = 4,047 m².

km² → ha

Exactly 100 hectares per km² — no approximation needed. A 10 km² forest = 1,000 ha. To convert km² to acres: multiply by 247. A country the size of 1 km² = 247 acres = about 24.7 city blocks in Manhattan.

Frequently Asked Questions — Area Converter

One acre equals exactly 43,560 square feet. This is the legally defined value used in the US and UK for land transactions. An acre is also equal to 4,047 square meters or 0.4047 hectares. An acre is roughly the size of a standard American football field excluding end zones.

One hectare equals exactly 10,000 square meters (100m × 100m). It also equals 2.471 acres. The hectare is the standard land measurement unit in most countries that use the metric system, including India for official agricultural records and government land documents.

One square meter equals approximately 10.764 square feet. Conversely, one square foot equals approximately 0.0929 square meters. This conversion is essential for real estate professionals working between metric and imperial specifications on international projects.

A cent is a unit of area used in South India — Tamil Nadu, Kerala and Andhra Pradesh. It equals 1/100th of an acre, or approximately 40.47 square meters (435.6 square feet). 100 cents = 1 acre. It is widely used for residential plot transactions in these states.

A ground is a unit of area used primarily in Chennai and Tamil Nadu. It equals exactly 2,400 square feet or approximately 222.97 square meters. In Chennai real estate, plots are commonly quoted in grounds — a typical residential plot might be 2 or 3 grounds.

Bigha varies significantly by state: Uttar Pradesh = 2,508 m², West Bengal = 1,338 m², Rajasthan = 2,529 m², Bihar ≈ 1,340 m². Always specify the state when using bigha, as the value can differ by nearly 2× between states.

One square kilometer equals approximately 247.105 acres. It also equals exactly 100 hectares. This conversion is commonly used in forest area reports, national park size comparisons and large agricultural holdings.

Indian Land Measurement Reference

Conversion table for land measurement units commonly used across different Indian states.

Unit	State / Region	Equals (sq ft)	Equals (m²)
Cent	Tamil Nadu, Kerala, AP	435.6	40.47
Ground	Chennai, Tamil Nadu	2,400	222.97
Guntha / Gunta	Maharashtra, Karnataka	1,089	101.17
Bigha (UP)	Uttar Pradesh	27,000	2,508
Bigha (Bengal)	West Bengal	14,400	1,338
Bigha (Rajasthan)	Rajasthan	27,225	2,529
Marla	Punjab, Haryana, Pakistan	272.25	25.29
Kanal	Punjab, Haryana	5,445	505.9
Acre	Pan-India	43,560	4,047
Hectare	International / Official	107,639	10,000