Area Converter

1. 1Type a value into any box — every other unit updates as you type.
2. 2Use the swap button to flip the two headline units.
3. 3Copy any result with the button beside it.
4. 4Adjust the decimal places if you need more or less precision.

Area units are the squares of length units, so their conversion factors are the length factors squared. One square foot is 0.3048² = 0.09290304 m², exactly.

The two land units are worth knowing. A hectare is a clean 10,000 m² — a square 100 metres on a side. An acre is a historical unit, originally the area a yoke of oxen could plough in a day, now defined as exactly 43,560 square feet, which works out at 4,046.856 m². There are about 2.471 acres to the hectare.

Conversion works by taking your value to a single base unit and then out again, so every pair of units is consistent with every other. Values are calculated at full double precision and only rounded for display, which means round-tripping a number through two conversions returns what you started with.

A building plot of 1,200 square feet

1. 1200 × 0.09290304 = 111.48

Result: About 111.48 square metres, or 0.0275 acres.