Area Converter

Type a number, pick the unit it's in, and read the conversions in the other units below. Square feet, square meters, acres, hectares, square kilometers, square miles — all live updates as you type.

Reach for it when you're reading a real-estate listing in one unit and pricing in another, or sizing land for landscaping, farming, or zoning paperwork. The conversions are pure constants — no rounding tricks — so the values agree with what your survey or deed reports.

Results round to a sensible number of decimals based on magnitude: small areas keep four places, large parcels stick to two.

The math is constant multiplication. One acre is exactly 43,560 square feet — a definition baked into US law since the 19th century, traceable back to a furlong (660 ft) by a chain (66 ft). One hectare is exactly 10,000 square meters, by definition. One square mile is exactly 640 acres. The bridge constants between metric and imperial are derived from the international yard, fixed in 1959 at 0.9144 meters exactly — making one square foot exactly 0.09290304 square meters. No rounding inside the chain; the tool stores the constants at full precision and rounds only at display.

Worked example. Enter 2.5 acres. The tool returns 108,900 sq ft (2.5 × 43,560), 10,117 sq m (108,900 × 0.09290304), 1.0117 hectares (sq m ÷ 10,000), and 0.0039 square miles (acres ÷ 640). All four values describe the same parcel. Realtors quote in acres, surveyors in square feet, agronomists in hectares, and zoning maps in square miles — having the same number in every unit at once removes the "is this listing actually big" question.

Where the tool can mislead. Land area numbers from old deeds are often surveyed values from the 1800s, before the international yard was standardized. A "1 acre" parcel in a deed from 1875 may be a few square feet off from a 2025 survey of the same land. The tool will faithfully convert whichever number you enter — it cannot fix surveying drift. For legal area in a property dispute, the controlling number is whatever your jurisdiction's most recent recorded survey says, not a calculator output.

Units omitted on purpose: square chains, square rods, square perches, square poles. They were standard in 19th-century US deeds and still appear in the UK occasionally, but day-to-day need is rare enough that the interface stays cleaner without them. If you actually need them, the conversions live in any surveying handbook — a square chain is 4,356 sq ft, a square rod is 272.25 sq ft.