Area Converter

Convert between square metres, acres, hectares, square feet, and other area units, with each unit’s origin explained.

Where Acres and Hectares Actually Come From

Area units split into two very different lineages depending on whether they were built from length units squared or defined independently for land measurement. Square metres, square feet, and square kilometres are straightforward, simply the corresponding length unit multiplied by itself, so converting between them is just the length conversion ratio squared — since a metre is 3.28 feet, a square metre is roughly 10.76 square feet, not simply 3.28. Acres and hectares broke from this pattern because they were defined specifically for land measurement long before anyone thought to standardize them against square metres. An acre traces back to the area a team of oxen could plough in a single day, an intentionally practical rather than mathematical definition, which is why an acre converts to an oddly specific 4,046.86 square metres rather than any clean round number. A hectare, by contrast, was deliberately designed as a clean metric unit, defined as exactly ten thousand square metres, or a square one hundred metres on each side, making hectare-to-square-metre conversion trivial while hectare-to-acre conversion carries that same awkward 2.47 ratio inherited from the acre’s non-metric origin.