**Every unit of length has a corresponding unit of area, namely the area of a square with the given side length. Thus areas can be measured in square metres (m ^{2}), square centimetres (cm^{2}), square millimetres (mm^{2}), square kilometres (km^{2}), square feet (ft^{2}), square yards (yd^{2}), square miles (mi^{2}), and so forth. Algebraically, these units can be thought of as the squares of the corresponding length units.**

The SI unit of area is the square metre, which is considered an SI derived unit.

### Converter of Area Unit

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### Conversions

Calculation of the area of a square whose length and width are 1 metre would be:

1 metre x 1 metre = 1 m^{2}

and therefore, another square with different sides can be calculated as:

3 metres x 2 metres = 6 m^{2}. This is, however, equivalent to 6 million millimetres square. Following this,

- 1 kilometre square = 1,000,000 metres square
- 1 metre square= 10,000 centimetres square = 1,000,000 millimetres square
- 1 centimetre square = 100 millimetres square

### Non-Metric units

In non-metric units, the conversion between two square units is the square of the conversion between the corresponding length units.

1 foot = 12 inches,

the relationship between square feet and square inches is

1 square foot = 144 square inches,

where 144 = 122 = 12 × 12. Similarly:

- 1 square yard = 9 square feet
- 1 square mile = 3,097,600 square yards = 27,878,400 square feet

In addition, conversion factors include:

- 1 square inch = 6.4516 square centimetres
- 1 square foot = 0.09290304 square metres
- 1 square yard = 0.83612736 square metres
- 1 square mile = 2.589988110336 square kilometres

### Other Units Including Historical

There are several other common units for area. The “Are” was the original unit of area in the metric system, with;

1 are = 100 square metres

Though the are has fallen out of use, the hectare is still commonly used to measure land:

1 hectare = 100 ares = 10,000 square metres = 0.01 square kilometres

Other uncommon metric units of area include the tetrad, the hectad, and the myriad.

The acre is also commonly used to measure land areas, where

1 acre = 4,840 square yards = 43,560 square feet.

An acre is approximately 40% of a hectare.

On the atomic scale, area is measured in units of barns, such that:

1 barn = 10−28 square meters.

The barn is commonly used in describing the cross sectional area of interaction in nuclear physics.

In India,

- 20 Dhurki = 1 Dhur
- 20 Dhur = 1 Khatha
- 20 Khata = 1 Bigha
- 32 Khata = 1 Acre

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