Area converter
Convert between cm², m², ha, acre, km² and more. Free area converter, instant and accurate.
Related tools
All Units & measures tools →This free online converter switches between mm², cm², m², a, ha and more. Type a value, pick the units to convert from and to, and read the exact result instantly — you also get the value in every other unit. No signup and no limits.
How to use it
- Type the value you want to convert.
- Choose the unit to convert from and the unit to convert to.
- Read the converted result — and the value in every other unit — instantly.
Frequently asked questions
How do I convert mm² to cm²?
For example, 1 mm² equals 0.01 cm². Enter any value above to convert instantly.
How do I convert cm² to mm²?
For example, 1 cm² equals 100 mm². Enter any value above to convert instantly.
How do I convert mm² to m²?
For example, 1 mm² equals 1.000e-6 m². Enter any value above to convert instantly.
Which units does this converter support?
It converts between mm², cm², m², a, ha, acre, km².
When is this conversion actually needed?
Reading a figure written in units you don't work in: a recipe in Fahrenheit, a spec sheet in inches, a fuel figure in miles per gallon, a bandwidth in megabits.
What goes wrong most often?
Assuming a unit name means one thing. A US gallon is four fifths of an imperial one, a US pint is smaller than a UK pint, and a megabyte is 1000 or 1024 kilobytes depending on who wrote the spec.
Where do the conversion factors come from?
Factors are the SI-defined ones where a definition exists, and the tool names the variant it uses wherever a unit has more than one. Conversion happens at full precision and is rounded only for display.
How precise is the result?
The conversion is computed at full double precision and only rounded for display, so a value copied out carries every digit the factor justifies.
Is this converter free?
Yes — it's completely free and instant, with no signup and no limits.