Population Density Calculator
Use this tool to calculate the population density in people per km² or per square mile.
Population Density Definition
Population density measures how many people live in a given area. It is usually expressed as people per square kilometer (km²) or people per square mile (mi²). This metric helps compare how crowded cities, regions, or countries are, regardless of their total population.
For example, a city with 1 million people may feel very different depending on whether those residents live within 100 km² or 1,000 km². Population density allows meaningful comparisons between places of different sizes.
How to Calculate Population Density
The formula is simple:
If a city has 2,000,000 inhabitants and 500 km² of land area, its density is:
This calculator automatically performs the calculation and allows you to convert results between square kilometers and square miles.
Why Population Density Matters
Population density affects:
- Urban planning
- Housing demand
- Transportation systems
- Infrastructure costs
- Environmental impact
- Quality of life
Highly dense cities like major metropolitan areas often have efficient public transport and compact development. Lower-density regions may offer more space but require longer travel distances.