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Area Converter

Convert between square metres, square kilometres, square miles, square yards, square feet, acres and hectares.

Area Converter

Professional grade conversion for area units.

Square Meter
Select Unit
0.000001
Square Kilometer
Select Unit

Conversion Formula

1 Square Meter ≈ 0.000001 Square Kilometer

What Area Converter does

Area conversion factors are the squares of the corresponding length factors, which is why the numbers are less intuitive: a square foot is not a twelfth of a square yard but a ninth of one.

The two land units, the acre and the hectare, come from different traditions. A hectare is exactly 10,000 square metres; an acre is about 4047, or roughly 40% of a hectare.

  • Metric: square kilometre, hectare, square metre
  • Imperial: square mile, acre, square yard, square foot

How to use Area Converter

  1. 1

    Enter the value

    Type the amount you want to convert. The result updates as you type.

  2. 2

    Select the units

    Choose what your value is in and what you want it in, for example square feet to square metres.

  3. 3

    Copy the result

    The copy button gives you the unformatted number, without thousands separators, ready to paste into a spreadsheet or code.

When to use it

Property listings

Floor area is quoted in square feet in some markets and square metres in others.

Land and agriculture

Converting between acres and hectares for plots and fields.

Estimating materials

Flooring, paint and turf are sold by area, often in units that do not match the plan.

Limits and known behaviour

  • Squared factors mean small errors compound: a 1% error in a length measurement becomes about 2% in the resulting area.
  • Traditional regional land units such as the rood, bigha or dunam are not included.
  • Arithmetic uses double-precision floating point, so a converted value can end in a small representation residue. That is a property of binary arithmetic, not of the conversion factor.

Privacy and data handling

Runs entirely in your browser

  • The conversion is arithmetic performed in this page. Nothing you enter is transmitted or stored.
  • The tool works offline once the page has loaded.

Site-wide data handling, including analytics and advertising, is described in the privacy policy.

Frequently asked questions

How big is an acre in square feet?

43,560 square feet, a figure inherited from medieval measures rather than designed. In metric terms it is about 4047 square metres.

Why is a square yard nine square feet?

Because a yard is three feet, and area scales with the square: three times three is nine.