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Population Density Analysis: The Math Behind Human Crowding

Learn how to calculate population density, growth rates, and doubling time with practical examples and formulas. Understand demography and answer key questions on human populations.

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Population Density Analysis: The Math Behind Human Crowding

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  1. Demography Demography is the study of Human Populations

  2. Population Density

  3. Population density is a way of describing how crowded a place is. Population density = number of people living in an area size of area (in km2) • Complete the following table for these places using a calculator:

  4. Place Population Area Population (km2) Density (people/km2) Very rural 50 1,000 0.05 Megacity 17,500,000 1,500 11,667 Suburbia 160,000 175 914 Rural 4,500 650 7

  5. 1. Write these questions in your book. • Is Canada’s population evenly spread out across the country? Why or why not? • What is the population density for most of Canada? (low, medium, high) • Do you think Canada is a crowded country? Explain.

  6. Answer the questions using the following map.

  7. Time for some geomath! • Let’s say a country has a population of 30,000,000. • Births = 390,000 immigrants = 220,000 • Deaths = 210,000 emigrants = 60,000 • How can we figure out how fast their population is growing???

  8. Birth Rate – the number of people born per year x 1000 population For example: BR = 390,000 x 1000 30,000,000 BR = 13 (this country had 13 people born per 1,000 people in that country)

  9. Death Rate – the number of deaths per year x 1000 population For example: BR = 210,000 x 1000 30,000,000 DR = 7 (this country had 7 people die per 1,000 people in that country)

  10. Natural Increase Rate= birth rate – death rate Example: 13 – 7 = 6 (per 1000) This means that the natural increase rate for this country is 6 people per 1000

  11. Immigration Ratethe number of immigrants per year x 1000 population For example: IR = 220,000 x 1000 30,000,000 IR = 7 (this country had 7 people immigrate per 1,000 people in that country)

  12. Emigration Ratethe number of emigrants per year x 1000 population For example: ER = 60,000 x 1000 30,000,000 ER = 2 (this country had 2 people emigrate per 1,000 people in that country)

  13. Net Migration Rate =Immigration Rate – Emigration Rate Example: 7 – 2 = 5 (per 1000) This means that the net migration rate for this country is 5 people per 1000

  14. Population Growth Rate = Natural Increase Rate + Net Migration Rate Example: 6 + 5 = 11 (per 1000) This country is growing at a rate of 11 people per 1000.

  15. Always express the population growth rate as a percent!! 11 X 100 = 1.1 % 1000 Or you can simply move the decimal one spot to the left.

  16. The Rule of 70 (Doubling Time) 70 Population Growth Rate (as a percent) 70 = 63.6 years 1.1 What this tells us is that the population of that country will double in 63.6 years.

  17. Example – The African country of Togo Togo has a population growth rate of 3.6% 70 = 19.4 years 3.6 The population of Togo will double in under 20 years.

  18. Time to practice…. • A country has a population of 1,807,242. • Births = 50,250 immigrants = 13,605 • Deaths = 42,658 emigrants = 11,500 • Do all the calculations (just like in the example we did)

  19. Answers • Birth rate = 27.8 per 1,000 • Death rate = 23.6 per 1,000 • Natural increase rate = 4.2 per 1,000 • Immigration rate = 7.5 per 1,000 • Emigration rate = 6.4 per 1,000 • Net Migration rate = 1.1 • Population Growth rate (%) = 5.3 = 0.53% • Doubling Time = 132.1 years

  20. Another practice question…. • A country has a population of 726,000 • Births = 12,500 immigrants = 3,605 • Deaths = 6,100 emigrants = 1,500 • Do all the calculations (just like in the example we did)

  21. Answers • Birth rate = 17.2 per 1,000 • Death rate = 8.4 per 1,000 • Natural increase rate = 8.8 per 1,000 • Immigration rate = 5 per 1,000 • Emigration rate = 2.1 per 1,000 • Net Migration rate = 2.9 • Population Growth rate (%) = 11.7 = 1.17% • Doubling Time = 60 years

  22. The end….

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