Description

A kanal is a traditional unit of land area in northern areas of Pakistan and also in the states of north India - Punjab (India), Kashmir and Himachal Pradesh; equal to 20 marlas

Marla (unit)

A marla is a unit of area.-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, or 272.25 square feet, 30.25 square yards, or 25.2929 square metres. As such, it was exactly one...

. Under British rule

British Raj

British Raj was the British rule in the Indian subcontinent between 1858 and 1947; The term can also refer to the period of dominion...

 the marla and kanal were standardized so that the kanal equals exactly 605 square yards or 1/8 acre

Acre

The acre is a unit of area in a number of different systems, including the imperial and U.S. customary systems. The most commonly used acres today are the international acre and, in the United States, the survey acre. The most common use of the acre is to measure tracts of land.The acre is related...

; this is equivalent to about 505.857 square meters .

Conversions

A kanal is equal to:

• 506 m²
• 20 marlas
• 605 square yards (Gaz in local languages and Urdu
  Urdu
  Urdu is a register of the Hindustani language that is identified with Muslims in South Asia. It belongs to the Indo-European family. Urdu is the national language and lingua franca of Pakistan. It is also widely spoken in some regions of India, where it is one of the 22 scheduled languages and an...
  
  )

Usually people widely use this unit in Punjab

Punjab region

The Punjab , also spelled Panjab |water]]s"), is a geographical region straddling the border between Pakistan and India which includes Punjab province in Pakistan and the states of the Punjab, Haryana, Himachal Pradesh, Chandigarh and some northern parts of the National Capital Territory of Delhi...

 and Islamabad

Islamabad

Islamabad is the capital of Pakistan and the tenth largest city in the country. Located within the Islamabad Capital Territory , the population of the city has grown from 100,000 in 1951 to 1.7 million in 2011...

. Whereas cities like Karachi

Karachi

Karachi is the largest city, main seaport and the main financial centre of Pakistan, as well as the capital of the province of Sindh. The city has an estimated population of 13 to 15 million, while the total metropolitan area has a population of over 18 million...

, Hyderabad etc. do not use kanals or marlas, they use yards (Gaz in Urdu) to measure land specifically. This unit creates much confusion among people when discussing the size of land when people plan to buy land in other cities. For example, a person in Karachi who wants to buy land in Lahore

Lahore

Lahore is the capital of the Pakistani province of Punjab and the second largest city in the country. With a rich and fabulous history dating back to over a thousand years ago, Lahore is no doubt Pakistan's cultural capital. One of the most densely populated cities in the world, Lahore remains a...

would be confused as he would not know the size of the land as he has been accustomed to yards not marlas. Well same goes the other way round if someone from Lahore wants to buy land in Karachi. Well this confusion has not been looked into by the Government and no restriction of unit has been imposed yet. People are carrying on and this needs to be cleared everywhere specially by the property dealers and print media. So people get accustome to both of the units and know the details of each unit and its conversion.

Some of the commonly available land size have been specified below with converted values and region {Formula is 1 marla = 30.25 sq yards) (Gaz in Urdu):

Lahore, Islamabad etc.:

3 marla = 90.75 sq yards (Gaz in Urdu),
5 marla = 151.25 sq yards (Gaz in Urdu),
7.5 marla = 226.875 sq yards (Gaz in Urdu),
10 marla = 302.5 sq yards (Gaz in Urdu),
15 marla = 453.75 sq yards (Gaz in Urdu),
1 Kanal = 605 sq yards (Gaz in Urdu),

Karachi, Hyderabad etc.:

125 sq yards (Gaz in Urdu) = 4.13 marla,
150 sq yards (Gaz in Urdu) = 4.95 marla,
250 sq yards (Gaz in Urdu) = 8.26 marla,
400 sq yards (Gaz in Urdu) = 13.22 marla,
500 sq yards (Gaz in Urdu) = 16.52 marla,
600 sq yards (Gaz in Urdu) = 19.83 marla,
1000 sq yards (Gaz in Urdu) = 33.05 marla,