🗺️ Area Unit Converter
Convert a parcel or region between square metres, hectares, acres, square kilometres, and square miles — the land-area units that mapping, surveying, and planning constantly switch between.
📐 Hectares, Acres, Square Kilometres & More
What is an Area Unit Converter?
It restates the same area in a different unit. Enter a value, pick the unit it's in and the unit you want, and it converts through square metres — the SI base for area — so hectares become acres, square kilometres become square miles, and back again.
Land and mapping data arrive in a jumble of units depending on the country and source. This converter normalises them so you can compare parcels, report figures, and sanity-check the areas your GIS computes.
❓ Frequently Asked Questions
Which area units does it convert?
It handles the five that come up most in mapping and land work: square metres (m²), hectares (ha), acres, square kilometres (km²), and square miles (mi²). Every conversion goes through square metres as the base unit, so any pair works in either direction.
How big is a hectare compared with an acre?
One hectare is exactly 10,000 m² — a square 100 m on a side. One acre is about 4,046.86 m², so a hectare is roughly 2.47 acres. There are exactly 640 acres in a square mile (one 'section' in the US land survey system), which the tool reproduces exactly.
Why do GIS area measurements depend on the projection?
Area is only preserved when you measure in an equal-area projection or on the ellipsoid. Measuring polygons in a projected coordinate reference system chosen for shape or navigation (like Web Mercator) inflates areas away from its standard lines. Compute the area in an equal-area CRS first, then use this converter to switch units.
Are these unit factors exact?
Yes. Metric conversions (m², ha, km²) are exact by definition, and the imperial ones use the international definitions: 1 acre = 4,046.8564224 m² and 1 square mile = 2,589,988.110336 m². That's why 1 mi² converts to exactly 640 acres with no rounding drift.