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Understanding Global Population Change Metrics

Learn how to measure population change through Crude Birth Rate, Crude Death Rate, Natural Increase Rate, Total Fertility Rate, Infant Mortality Rate, and Life Expectancy. Explore key metrics!

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Understanding Global Population Change Metrics

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  1. Key Issue #2: Where has the World’s population increased?

  2. How do you measure population change?

  3. “You can measure population change through the Crude Birth Rate, the Crude Death Rate, and the Natural Increase Rate.”

  4. The Crude Birth Rate (CBR) is the total number of live births a year for every 1,000 people alive in the society.

  5. The Crude Death Rate (CDR) is the total number of deathsa year for every 1,000 people alive in the society.

  6. The Natural Increase Rate (NIR) is the percentage by which a population grows in a year.

  7. NIR = (Crude birth rate − Crude death rate) / 10

  8. The Total Fertility Rate(TFR) is the average number of children a woman will have during her childbearing years.

  9. The Infant Mortality Rate (IMR) is the annual number of deaths of infants under 1 year compared with total live births.

  10. Life Expectancy measures the average number of years a newborn can expect to live at current morbidity levels.

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