Area converter
Convert square metres, square kilometres, square feet, acres, and hectares in any direction, instantly and entirely in your browser. Nothing is uploaded.
The amount to convert. Leave empty or non-numeric for no result.
Metric, imperial, and land area in one table
Area spans three families people switch between: metric (mm², cm², m², km²), imperial (square inches, square feet, square yards), and the land-measurement units acre and hectare. Each imperial area is the square of an exact metric length — a square inch is precisely 0.0254² m² — and the acre and hectare use their exact definitions, so this converter moves between them without the rounding errors of remembered approximations. Pick any two units and convert in either direction.
Runs entirely on your device
There is no server, no account, and no upload. The math is a few lines of JavaScript that execute in your browser, so the tool works offline and your figures stay private, whether you are sizing a room, a plot of land, or a floor plan.
Frequently asked questions
- Does this send my data anywhere?
- No. The converter is plain JavaScript that runs entirely in your browser. There is no upload, no network request, and no account. The numbers you type never leave your device.
- How many square metres are in an acre?
- Exactly 4046.8564224. The acre is defined as 4046.8564224 square metres, so converting acres to m², hectares, or square feet uses that exact value rather than a rounded approximation.
- How many square metres are in a hectare?
- Exactly 10000. A hectare is a square 100 m on each side, so 1 ha = 10000 m² = 0.01 km². That makes a square kilometre equal to 100 hectares.
- Which units are supported?
- Metric — square millimetres, square centimetres, square metres, and square kilometres — imperial — square inches, square feet, and square yards — and the land-area units acre and hectare. You can convert between any two in either direction.
- How precise are the results?
- Imperial areas are the squares of the exact metric length definitions (1 in² = 0.0254² m²), and the acre and hectare use their exact definitions, so conversions are exact within floating-point limits. Long fractional results are rounded to twelve significant figures for readability.