Extract from the publication ‘Census of Population and Housing 2021 – Volume 1‘ published by the Malta National Statistics Office
The population of Kalkara throughout the years
| Year | 1921 | 1931 | 1948 | 1957 | 1967 | 1985 | 1995 | 2005 | 2011 | 2021 |
| Population | 1,698 | 1,899 | 2,068 | 2,101 | 1,945 | 2,086 | 2,833 | 2,882 | 2,946 | 3,105 |
The 2021 Census
The number of males living in Kalkara is 1,618, 203 of which are foreigners. The average age of males living in Kalkara is 42.3 years.
The number of females living in Kalkara is 1,487, 109 of which are foreigners. The average age of males living in Kalkara is 45.1 years.
The average age of the population of Kalkara is 43.7years while that of the Southern Harbour District is (in which Kalkara forms part of) 43.4 years, this same district is the second eldest after the Gozo District. The Maltese average age is 41.7 years.
The population of Kalkara according to age
| age between | 0-9 | 10-19 | 20-29 | 30-39 | 40-49 | 50-59 | 60-69 | 70-79 | 80-89 | older than 89 |
| Males | 128 | 154 | 202 | 253 | 244 | 210 | 241 | 146 | 39 | 1 |
| Females | 98 | 121 | 186 | 211 | 199 | 218 | 225 | 160 | 63 | 6 |
| Total | 226 | 275 | 388 | 464 | 443 | 428 | 466 | 306 | 102 | 7 |
The majority of females are dominant only within age groups of 50-59, 70-79, 80-89 and older than 89 years.
The dependency ratio (the sum of population aged 0‐14 and 65+ as a percentage of the working‐age population; that is 15‐64) is at 46.7%, this percentage is identical to that of Malta as a whole. The old age dependency ratio of Kalkara of those aged 65+ is 29.5% while that of Malta as a whole is 27.6%.
Kalkara has an area of 1.76 kilometers squared, the population of Kalkara for every one kilometer squared is 1,765 inhabitants. When compared to the three Cities of Cottonera which together have an area of 1.59 kilometer squared and population of 23,857 inhabitants, Kalkara has the largest area but the smallest population.
The population of Kalkara in accordance to racial origin
| Racial Origin | Caucasian | Asian | Arab | African | Hispanic or Latino | More than one racial origin | Total |
| Amount of inhabitants | 2,975 | 58 | 16 | 12 | 17 | 27 | 3,105 |
The population of Kalkara in accordance to religious affiliation
| Religion | Roman Catholicism | Islam | Hinduism | Orthodoxy | Church of England | Protestantism | Buddhism | Judaism | Others | Atheist | Total |
| Amount of inhabitants | 2,487 | 56 | 4 | 21 | 26 | 16 | 13 | 7 | 5 | 105 | 2,740 |