Area Unit Converter
Convert between 13 area units online, from square millimeters up to square kilometers, including ares, hectares, acres and the Chinese mu. Enter one value and every other unit is calculated in real time.
FreeOnline Tool
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How to Use
- Type the area you want to convert into the "Value" box
- Pick the unit that value is expressed in from the "Unit" dropdown
- The table below instantly lists the equivalent value in every remaining unit
Features
- Converts between 13 area units: square millimeter (mm²), square centimeter (cm²), square decimeter (dm²), square meter (m²), are, hectare (ha), square kilometer (km²), square inch (in²), square foot (ft²), square yard (yd²), acre, square mile (mi²) and the Chinese mu
- Enter a value in any unit and the table shows the other 12 conversions at the same time
- The table refreshes as you type or switch units, with no button to press
- Results keep 8 significant digits and trailing zeros are stripped automatically
Use Cases
Real estate and land area conversion
Listings quote area in square meters, mu, acres or hectares, so convert everything to one unit before comparing properties.
Metric and traditional Chinese units
Import/export paperwork and cross-border property documents use square feet and acres that need converting into familiar square meters or mu.
Agriculture and land surveying
Farmland is normally measured in mu, so cross-check those figures against hectares and square meters.
Engineering area checks
Reconcile areas expressed in different units, such as mm² and cm², across construction and interior design drawings.
FAQ
Which area units are supported?
Thirteen units are built in: square millimeter, square centimeter, square decimeter, square meter, are, hectare, square kilometer, square inch, square foot, square yard, acre, square mile and the Chinese mu. Pick any one as the input unit and you get the value in all the others.
How many square meters is one Chinese mu?
The tool uses 1 mu = 666.67 square meters, the approximation commonly used in China.
Are the are and the Chinese mu the same unit?
No. The are is a metric unit equal to 100 square meters, while the mu is a traditional Chinese land measure of roughly 666.67 square meters. The two differ by a large factor, so the tool lists them separately - be careful not to confuse them.
How precise are the results?
Results keep 8 significant digits and drop any unnecessary trailing zeros, which is accurate enough for almost all real estate, agricultural and engineering conversions.