Area Converter — The Complete Guide to Area Unit Conversion
Whether you are buying land, planning a construction project, or working on an agricultural survey, converting between area units is a task you will encounter frequently. Our free Area Converter tool allows you to instantly convert between square feet, acres, hectares, square meters, bigha, kanal, marla, and many other area units used worldwide. No sign-up required — just enter a value and get accurate results in real time.
What is Area?
Area is the measure of a two-dimensional surface or region. It tells you how much space a flat shape occupies. In mathematics, area is expressed in square units — for example, square meters (m²), square feet (ft²), or square kilometers (km²). Understanding area is essential in real estate, agriculture, construction, interior design, and urban planning.
The concept dates back to ancient civilizations where farmers needed to measure land for taxation and crop planning. Today, area measurements are standardized through the International System of Units (SI), though many traditional units remain in common use across different countries and regions.
Common Area Units Explained
Different regions and industries use different area units. Here is a comprehensive overview of the most important ones:
Metric Units
- Square Meter (m²) — The SI base unit of area. One square meter is the area of a square with sides of 1 meter each.
- Square Kilometer (km²) — Equals 1,000,000 m². Used for measuring cities, countries, and large geographical areas.
- Hectare (ha) — Equals 10,000 m² (100m × 100m). The standard metric unit for agricultural land measurement worldwide.
- Square Centimeter (cm²) — Equals 0.0001 m². Used for small surfaces and in scientific calculations.
Imperial / US Customary Units
- Square Foot (ft²) — The most common unit for measuring room sizes, apartments, and commercial properties in the US, UK, and India.
- Square Inch (in²) — Used for small measurements like screen sizes and material samples.
- Square Yard (yd²) — Equals 9 sq ft. Used for carpeting, flooring, and some land measurements.
- Acre — Equals 43,560 sq ft or approximately 4,047 m². Standard land measurement in the US, UK, and many Commonwealth nations.
- Square Mile (mi²) — Equals 640 acres. Used for large geographic areas.
South Asian Traditional Units
- Bigha — A traditional unit varying by region. In UP: ~27,000 sq ft; in Bihar: ~27,220 sq ft; in Assam: ~14,400 sq ft.
- Kanal — Used in northern India and Pakistan. 1 kanal = 20 marlas ≈ 5,445 sq ft.
- Marla — 1 marla ≈ 272.25 sq ft. Common in Punjab, Haryana, and Pakistan.
- Biswa — 1 biswa = 1/20th of a bigha. Size varies by state in India.
- Guntha/Gunta — Used in Maharashtra and Karnataka. 1 guntha = 1,089 sq ft.
Area Conversion Formulas
Below are the key conversion relationships you need to know:
| From | To | Multiply By |
|---|---|---|
| 1 Square Foot | Square Meters | 0.092903 |
| 1 Square Meter | Square Feet | 10.7639 |
| 1 Acre | Square Feet | 43,560 |
| 1 Acre | Hectares | 0.4047 |
| 1 Hectare | Acres | 2.47105 |
| 1 Hectare | Square Meters | 10,000 |
| 1 Square Kilometer | Acres | 247.105 |
| 1 Bigha (UP) | Square Feet | 27,000 |
| 1 Kanal | Square Feet | 5,445 |
| 1 Marla | Square Feet | 272.25 |
Real Estate Applications
Area conversion is critical in the real estate industry. When buying property internationally, you may encounter listings in square meters (Europe, Asia) or square feet (US, India, UK). Agricultural land is typically measured in acres or hectares, while in rural South Asia, bigha and kanal are standard. Understanding these conversions helps you:
- Compare property sizes across different listing platforms and countries
- Calculate carpet area vs. built-up area vs. super built-up area in apartments
- Determine land value per unit area for investment decisions
- Plan construction projects by converting architect drawings to actual dimensions
- Verify government land records that may use traditional units like bigha or guntha
- Calculate Floor Area Ratio (FAR) for building permissions
How Area Conversion Works
All area conversions work through a common reference unit — typically the square meter. To convert from unit A to unit B, the tool first converts unit A to square meters using its known factor, then converts from square meters to unit B. The formula is:
Result = Value × (Factor_of_Source_Unit / Factor_of_Target_Unit)
For example, to convert 5,000 sq ft to acres: 5,000 × (0.092903 / 4046.86) = 5,000 / 43,560 ≈ 0.1148 acres.
Tips for Accurate Area Measurement
- Always confirm which regional variant of a unit is being used (e.g., bigha varies by state)
- For irregular plots, divide into regular shapes, calculate each area, then sum them
- Use GPS-based survey tools for large agricultural plots to get precise measurements
- Remember that carpet area (usable floor space) is typically 70-80% of built-up area in Indian real estate
- Cross-verify land registry documents with physical measurements before purchase
Frequently Asked Questions
How many square feet are in one acre?
One acre equals exactly 43,560 square feet. This is approximately 4,047 square meters or 0.4047 hectares. An acre is roughly the size of a football field without the end zones.
How do I convert hectares to acres?
Multiply the hectare value by 2.47105 to get acres. For example, 5 hectares = 5 × 2.47105 = 12.355 acres. Conversely, multiply acres by 0.4047 to get hectares.
What is a bigha and how big is it?
A bigha is a traditional South Asian land measurement unit whose size varies significantly by region. In Uttar Pradesh, 1 bigha ≈ 27,000 sq ft; in Bihar ≈ 27,220 sq ft; in Assam ≈ 14,400 sq ft; in Rajasthan (pucca bigha) ≈ 27,225 sq ft. Always confirm the local definition when dealing with bigha measurements.
How many square meters are in one hectare?
One hectare equals exactly 10,000 square meters. Think of it as a square measuring 100 meters on each side. The hectare is the standard metric unit used globally for measuring agricultural land and large properties.
What is the difference between kanal and marla?
A kanal equals 20 marlas. One marla is approximately 272.25 square feet (about 25.29 square meters), making one kanal approximately 5,445 square feet. These units are predominantly used in northern India (Punjab, Haryana) and Pakistan for land measurement.
How do I convert square feet to square meters?
Multiply the square feet value by 0.092903 to get square meters. For example, 1,500 sq ft × 0.092903 = 139.35 square meters. This conversion is essential when comparing property sizes between countries using metric and imperial systems.
Which area unit is used for real estate in India?
In India, square feet (sq ft) is the most common unit for apartments and commercial properties. Agricultural land is measured in acres, bigha, or hectares depending on the state. In northern states like Punjab and Haryana, kanal and marla are also commonly used.
How many acres are in one square mile?
One square mile equals exactly 640 acres. This is approximately 259 hectares or 2.59 square kilometers. This conversion is useful when working with large rural land parcels or geographic surveys.
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