Area Converter

How to Use the Area Converter

Enter a value under "From", pick its unit and the unit you want to convert to, and the result updates instantly. Use the swap button to flip the two units in one click. All conversions run through square meters as a common base, so any unit here can be converted to any other, whether you're going from acres to hectares, square feet to square meters, or square centimeters to square yards.

Worked Examples

A few real conversions this tool produces, so you can see the math behind the numbers:

• 1 acre to square feet: 1 acre = 43,560 square feet exactly. This is the standard figure used in US real estate listings and land surveys.
• 1 acre to hectares: 1 acre = 0.404686 hectares. Flip it around and 1 hectare = 2.471054 acres, which is why "about 2.5 acres per hectare" is a common rule of thumb.
• 1 square mile to acres: 1 square mile = 640 acres exactly, a fixed ratio that goes back to how US land was originally surveyed and subdivided into sections.
• 1 square mile to square kilometers: 1 square mile = 2.589988 square kilometers, useful when comparing city or district sizes reported in different unit systems.
• A typical football field (1.32 acres) to square meters: 1.32 acres = 5,341.85 square meters, close to the roughly 5,350 square meters usually cited for a regulation American football field including end zones.

Common Area Units Explained

Square meters (sqm) is the SI base unit for area and the default reference this tool converts everything through. It's used worldwide for apartment sizes, room dimensions, and small plots.

Square feet (sqft) is the standard unit for property size in the US, and commonly used in India and several other countries for residential and commercial listings.

Acres measure larger land parcels, farms, and estates, mainly in the US, UK, and countries that inherited the imperial system. One acre is roughly the size of a standard American football field minus the end zones.

Hectares are the metric equivalent for large land areas, used for farmland, forests, and national land-area statistics almost everywhere outside the US.

Square kilometers and square miles describe city, region, or country-scale areas. A square mile is exactly 640 acres, and a square kilometer is exactly 100 hectares, both convenient round numbers within their own systems.

Square centimeters and square yards round out the list for small craft-scale conversions and mid-size plots respectively, since square meters can feel too coarse or too fine depending on what you're measuring.

Common Mistakes When Converting Area

The most frequent error is confusing linear conversion factors with area conversion factors. If 1 meter equals 3.28 feet, it's tempting to assume 1 square meter equals 3.28 square feet, but area scales by the square of the linear factor, so 1 square meter actually equals 10.76 square feet (3.28 squared, roughly). Always use area-specific factors, not linear ones, when converting square units.

Another common mix-up is treating "acre" and "hectare" as interchangeable, since both are used for land in casual conversation. They differ by about 2.47x, so a 10-acre farm is only about 4.05 hectares, not 10.

Watch out for regional area units too. India's marla, bigha, cent, and guntha, or Southeast Asia's rai, vary in exact size by state or country and aren't standardized internationally, so they're intentionally left out of this converter. Confirm the local definition before relying on a marla or bigha conversion for anything official.

Real-World Use Cases

Real estate: comparing a property listed in square feet against one listed in square meters, especially common when comparing US and international listings side by side.

Agriculture: converting farm size between acres and hectares for equipment specs, fertilizer application rates, or crop yield reporting, since agricultural data sources mix both units depending on the country.

Construction and land development: converting a plot's area between square meters and square feet when architectural drawings use one system but local permits or budgets use another.

Education and general reference: converting square miles to square kilometers when comparing the size of cities, countries, or geographic regions cited in different sources.

Frequently Asked Questions

How many square feet are in an acre?

1 acre equals 43,560 square feet. This tool computes that automatically, along with conversions to hectares, square meters, and square miles.

What's the difference between an acre and a hectare?

A hectare (10,000 square meters) is larger than an acre (about 4,047 square meters). One hectare is approximately 2.47 acres.

How many acres are in a square mile?

1 square mile equals exactly 640 acres. This is a fixed relationship dating back to old US land survey rules, where a square mile (a "section") was routinely divided into quarters and eighths for farm allotments, and 640 came out as a convenient whole number.

Why do real estate listings sometimes use different area units in different countries?

Area units follow whichever measurement system a country standardized on historically. The US and UK still use acres and square feet for land and property. Most of the world uses square meters and hectares under the metric system. India additionally uses regional units like marla, bigha, and cent depending on the state. This tool covers the internationally common units; regional India-specific units aren't included since their exact size varies by state.

Is this area converter accurate enough for legal or survey documents?

The conversion factors used here are the official internationally defined values (for example 1 acre = 4046.8564224 square meters exactly), rounded to six decimal places in the result. That's accurate enough for everyday planning, real estate comparisons, and construction estimates. For legal land titles, mortgage documents, or official surveys, always use the figures from your surveyor or land registry, since those may reflect local rounding conventions or historical measurements that predate the standardized conversion factor.

Why does the result sometimes show many decimal places?

Area conversions between non-metric and metric units (like acres to square meters) rarely land on a round number, because the units were defined independently of each other. The tool rounds to six decimal places so you get full precision without an unreadably long number. For most real-world uses, rounding to one or two decimal places yourself is perfectly fine.