Free Area Converter
Convert area units instantly — square meters, square feet, acres, hectares, square kilometers, and more. Free, symmetrical, no sign-up.
Exact Conversion Formula & Multipliers
Area conversions square the underlying length ratios: 1 acre = 4,046.8564224 square meters (a legally defined exact value based on the surveyor's chain), 1 hectare = 10,000 square meters exactly, and 1 square mile = 2.589988110336 square kilometers. Because area scales with the square of length, a small rounding difference in a linear unit becomes roughly twice as large once squared — which is why this converter carries full decimal precision rather than rounding intermediate steps.
Practical Real-World Scenarios
- Real estate: property listings in the US quote square feet while most of the world uses square meters, and land parcels are frequently deeded in acres or hectares.
- Agriculture: farm size is measured in acres in the US and UK but hectares almost everywhere else, affecting how yield-per-area statistics are compared internationally.
- Urban planning and construction: floor-area-ratio and zoning calculations often require converting between square feet, square meters, and acres within a single project document.
Historical & Technical Background
The acre originated as the amount of land a yoke of oxen could plow in a day, making it a practical rather than mathematical unit — which is why it doesn't convert to square feet in a round number. The hectare, by contrast, is purely metric: exactly 100 meters by 100 meters, chosen for administrative and agricultural record-keeping after the metric system's adoption. Both units persist today because land records, deeds, and agricultural statistics are rarely re-surveyed once established, so old and new systems coexist indefinitely.
Precision & Accuracy Statement
Conversion factors use the exact defined values given in NIST Special Publication 811 and the BIPM SI Brochure wherever such a definition exists (for example 1 lb = 0.45359237 kg, 1 in = 2.54 cm, 1 US gal = 3.785411784 L, g₀ = 9.80665 m/s²); derived factors are computed from those definitions rather than copied as rounded figures. Results are calculated in double-precision floating point and shown to 10 significant digits, so the last digit can differ by one unit of rounding. The rounded figures in the text and tables above are for reading convenience.
How This Converter Works
Area units vary widely by context — square meters and hectares for land in metric countries, acres and square feet in the US and UK. Our converter handles 10 area units simultaneously.
Common Conversions
| Square Meters | Square Feet | Context |
|---|---|---|
| 1 m² | 10.764 ft² | A square 1 m × 1 m |
| 100 m² | 1,076.4 ft² | Average apartment |
| 4,047 m² | 43,560 ft² | One acre |
| 10,000 m² | 107,639 ft² | One hectare |
| 2,589,988 m² | 27,878,400 ft² | One square mile |