Population density is a simple yet powerful metric: it tells us how many people live in a given area. Whether you’re studying cities, countries, or ecological zones, density helps compare how crowded or spacious different regions are. With the Population Density Calculator, you can quickly determine population density and convert between multiple units of area.
📐 Population Density Calculator
Compute population density from population and land area, with instant unit conversions.
Density (per km²)
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Density (per mi²)
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Density (per selected unit)
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Converted Area
Area (km²)—
Area (mi²)—
Area (hectares)—
Area (acres)—
Area (m²)—
Need a target density? Compute required area
Required Area
— km²
— mi²
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🛠️ How to Use the Calculator
- Enter the population – The total number of people in the area.
- Input the area – Enter the size of the region you’re analyzing.
- Select the unit – Choose km², mi², hectares, acres, or m².
- View results instantly – The tool calculates density per km², per mi², and per your chosen unit.
- Check conversions – The calculator also displays the equivalent area in all major units.
- Target density option – If you have a target population density in mind, enter it to see how much area would be required to support the given population.
📊 Examples
- Example 1 – City analysis
Population: 500,000
Area: 250 km²
→ Density = 2,000 people per km². - Example 2 – U.S. state comparison
Population: 10,000,000
Area: 58,000 mi²
→ Density ≈ 172 people per mi² (≈ 67 per km²). - Example 3 – Required land
Population: 1,000,000
Target density: 1,000 per km²
→ Required area = 1,000 km².
🌍 Applications
- Urban planning – Assess how crowded a city is and forecast infrastructure needs.
- Environmental studies – Measure human pressure on ecosystems.
- Agriculture & land use – Estimate how many people can live sustainably in a given region.
- Education – A handy teaching tool for geography, demography, and environmental science.
- Everyday curiosity – Compare your hometown’s density with other places around the world.
✅ Try It Now
Use the calculator above to explore how density changes with population size and land area. It’s an essential metric for planning, analysis, and learning.