How many square meters make up a square

Units of area

We will deal with the units of area in this article. We'll show you in a table which units of area are available and how to convert them. This article belongs to the field of mathematics.

How big is a plot of land? How big is a forest? These questions can often be answered well by specifying the area. For a rectangular plot of land, the size is calculated from the length multiplied by the width (area = length x width). Example: A rectangular plot of land is 50 m long and 30 m wide. The area is thus: A = 50 m ยท 30 m = 1500 m2. As you can see in this example, not only the "numbers" are multiplied with each other, but also the units. For this reason it is also important that you only multiply the same units with each other.


Area units table

The following table contains an overview of common units of area, their designation and the conversion into another unit of area.

Table scrollable to the right
unitdescription conversion
1 mm2Square millimeters-
1 cm2Square centimeters1 cm2 = 100 mm2
1 dm2Square decimeters1 dm2 = 100 cm2 = 10,000 mm2
1 m2square meters1 m2 = 100 dm2 = 10,000 cm2
1 aAr1 a = 100 m2
1 haHectares1 ha = 100 a
1 km2Square kilometre1 km2 = 100 ha = 1,000 m1,000 m

Convert area units: examples

First a small note: We will look at details on area calculation in the Fundamentals of Geometry in one of the following articles. But knowing how to convert the sizes helps a lot. Because that's where many students fail.

tip: If you have problems, for example, getting directly from square meters to square millimeters, you can also calculate intermediate steps with square decimeters and square centimeters:

example 1: Convert 5 square meters to all the units listed in the table above.


  • 5,000,000 mm2
  • 50,000 cm2
  • 500 dm2
  • 5 m2
  • 0.05 a
  • 0.0005 ha
  • 0.000005 km2

Example 2: Convert 10 square meters to all the units listed in the table above.


  • 10,000,000 mm2
  • 100,000 cm2
  • 1,000 dm2
  • 10 m2
  • 0.10 a
  • 0.0010 ha
  • 0.000010 km2

Example 3: Convert 132.46 square meters to all of the units in the table above.

  • 132,460,000 mm2
  • 1,324,600 cm2
  • 13,246 dm2
  • 132.46 m2
  • 1.3246 a
  • 0.013246 ha
  • 0.00013246 km2


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