The total population of Croatia is 4,164,783 people. People in Croatia speak the Croatian language. The linguistic diversity of Croatia is vaguely diverse according to a fractionalization scale which for Croatia is 0.0763. The median age is approximately 42.1 years. Life expectancy in Croatia is 78. The female fertility rate in Croatia is 1.5. Around 24% of the population of Croatia are obese. The ethnic diversity is diverse according to a fractionalization scale which for Croatia is 0.369. To find out specifics of language, religion, age, gender distribution, and advancement of people in Croatia see the sections below, as well as visit the section concerning the education in the country.

Population
In Croatia, the population density is 76 people per square kilometer (198 per square mile). Because of this statistic, this country is considered to be sparsely populated. The total population of Croatia is 4,164,783 people. Croatia has approximately 576,883 foreign immigrants. Immigrants in Croatia represent 0.3 percent of the total number of immigrants in the world. Immigrants in Croatia represent 17.6 percent of the total number of immigrants in the world. The ethnic diversity of Croatia is diverse according to a fractionalization scale based on ethnicity. Ethnic fractionalization (EF) deals with the number, sizes, socioeconomic distribution, and geographical location of distinct cultural groups, usually in a state or some otherwise delineated territory. Specific cultural features might refer to language, skin color, religion, ethnicity, customs and traditions, history, or other distinctive criteria, alone or in combination. Frequently, these features are used for social exclusion and the monopolization of power. The index of ethnic fractionalization in Croatia is 0.369. This means that a certain diversity is present in Croatia, although all people can still be divided into a relatively small number of major ethnic groups. EF is usually measured as 1 minus the Herfindahl concentration index of ethnolinguistic group shares, which reproduces the probability that two randomly drawn individuals from the population belong to different groups. The theoretical maximum of EF of 1 means that each person belongs to a different group. Read below for statistics of Croatia on median age and gender distribution at various ages.

Age
The median age is approximately 42.1 years. The median age for men is 40.2, while the median age for women is 43.9.

Gender
The sex ratio, or the number of males for each female (estimated at birth), is 1.055. It can be further divided into the following categories: sex ratio under 15 - 1.06; sex ratio from 15 to 64 - 0.99; sex ratio over 64 - 0.64; total sex ratio - 0.93. Total sex ratio is different from sex ratio estimated at birth. This is due to the fact that some newborns are considered in the sex ratio estimated at birth but pass away within the first weeks of their life and are not included in the total sex ratio.

Religion
The majority religion of Croatia is Christianity, the followers of which comprise 93.4% of all religious believers in the country. Christianity is an Abrahamic monotheistic religion based on the life and teachings of Jesus Christ as presented in the New Testament. Christianity is the world's largest religion, with over 2.4 billion adherents, known as Christians. Christians believe that Jesus is the Son of God and the savior of humanity whose coming as Christ or the Messiah was prophesied in the Old Testament. Besides Christianity, there are several other religions present within the country. Other religions in Croatia are Hinduism, folk religions. The religious diversity of Croatia is diverse according to a fractionalization scale based on the number of religions in Croatia. The index of religious fractionalization in Croatia is 0.4447. This score means that within the country there is one major religion and several other minor beliefs.