A marla is a unit

Units of measurement

A unit of measurement is a definite magnitude of a physical quantity, defined and adopted by convention and/or by law, that is used as a standard for measurement of the same physical quantity. Any other value of the physical quantity can be expressed as a simple multiple of the unit of...

 of area

Area

Area is a quantity that expresses the extent of a two-dimensional surface or shape in the plane. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape, or the amount of paint necessary to cover the surface with a single coat...

.

Description in detail

The marla is a traditional unit of area in Pakistan, India,and Bangladesh . The marla was standardized under British rule to be equal to the square rod

Rod (unit)

The rod is a unit of length equal to 5.5 yards, 5.0292 metres, 16.5 feet, or of a statute mile. A rod is the same length as a perch or a pole. In old English, the term lug is also used.-History:...

, or 272.25 square feet, 30.25 square yard

Yard

A yard is a unit of length in several different systems including English units, Imperial units and United States customary units. It is equal to 3 feet or 36 inches...

s, or 25.2929 square metre

Metre

The metre , symbol m, is the base unit of length in the International System of Units . Originally intended to be one ten-millionth of the distance from the Earth's equator to the North Pole , its definition has been periodically refined to reflect growing knowledge of metrology...

s. As such, it was exactly one 160th of an acre.

The definition of marla varies between India and Pakistan. In North India, a marla is now based on the yard rather than the acre, and is equal to 25 sq yards. In Pakistan, it is still equal to 30.25 sq yards. A Pakistani marla is often referred to as a "big marla" in India.

One Pakistani Marla is equal to 9 sq karm in Urdu and karoon in Punjabi language 9 Sarsahi is equal to one Marla. 20 marlas in Pakistan are equal to one kanal.
Bangladesh and india have same marla(225 square foot).

Conversion table

Imperial	Metric	North Indian marla	Pakistani marla
1 square foot (144 square inches)	0.0929 sq. metres (929.03 sq. centimetres)	0.040 sarsahi	0.033 karm
1 square yard (9 sq. feet)	0.836 sq. metres	0.360 sarsahi (0.040 marla)	0.298 karm (0.0331 marla)
1.196 sq. yards (10.76 sq. feet)	1 square metre	0.431 sarsahi (0.0478 marla)	0.356 karm (0.0395 marla)
2.778 sq. yards (25 sq. feet)	2.322 sq. metres	1 sarsahi (0.111 marla)	0.826 karm (0.0918 marla)
3.361 sq. yards (30.25 sq. feet)	2.810 sq. metres	1.21 sarsahi (0.134 marla)	1 karm (0.111 marla)
25 sq. yards (225 sq. feet)	20.903 sq. metres	1 marla (9 sarsahi)	0.826 marla (7.438 karm)
30.25 sq. yards (272.25 sq. feet = 0.0625 acres)	25.293 sq. metres	1.21 marla (10.89 sarsahi)	1 marla (9 karm = 0.05 kanal)
605 sq. yards (0.125 acres)	505.857 sq. metres (0.0506 hectares)	24.2 marla	1 kanal (20 marla)
1 acre (4840 sq. yards)	0.405 hectares (4046.856 sq. metr	8 kanal (160 marla)
2.471 acres	1 hectare (10000 sq. metres = 0.01 sq. kilometres)	478.396 marla	19.768 kanal (395.369 marla)
247.1 acres (0.386 sq. miles)	1 square kilometre (100 hectares)	47,839.6 marla	1976.8 kanal (39,536.9 marla)
1 square mile (640 acres)	2.590 sq. kilometres (259.0 hectares)	123,904 marla