# Units of Area

The fundamental unit for measuring area is the square meter, which is the area of a square whose sides measure 1 meter.

There are also other units for measuring large and small quantities of area:

 square kilometer km2 1,000,000 m2 square hectometer hm2 10,000 m2 square decameter dam2 100 m2 square meter m2 1 m2 square decimeter dm2 0.01 m2 square centimeter cm2 0.0001 m2 square milimeter mm2 0.000001 m2

Note that each unit is 100 times larger than the previous.

Therefore, the problem of converting units to other units becomes an issue of multiplying or dividing the unit by one followed by as many pairs of zeros as there are places between them.

1.5 hm2 m2

In this case, multiply (because the hm2 is greater than the m2) the unit by one followed by four zeros, since there are two places between both units.

1.5 · 10,000 = 15,000 m2

15,000 mm2 m2

In this case, divide (because the mm2 is smaller than the m2) by one followed by six zeros, since there are three places between both units.

15.000 : 1,000,000 = 0.015 m2

### Land Area Measurements

#### Hectare

The hectare is equivalent to the square hectometer.

1 ha = 1 hm2 = 10,000 m²

#### Are

The are is equivalent to the square decameter.

1 a = 1 dam2 = 100 m²

#### Centiare

The centiare is equivalent to the square meter.

1 ca = 1 m²

Convert to hectares:

211,943 a

211,943 : 100 = 2,119.43 ha

356,500 m2

356,500 : 10,000 = 35.65 hm2 = 35.65 ha

0.425 km2

0.425 · 100 = 42.5 hm2 = 42.5 ha

8 km2 31 hm2 50 dam2

8 · 100 + 31 + 50 : 100 = 731.5 hm2 = 831.5 ha

91 m2 33 dm2 10 cm2 =

91 : 10,000 + 33 : 1,000,000 + 10 : 100,000,000=

0.00913310 hm2 = 0.00913310 ha