How to Calculate Crude Net Migration Rate

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Migration and immigration are both hot button political issues in the U.S. The net migration rate is one tool used in demography and population geography to examine migration in and out of an area. Similar to rates of birth, fertility and death, migration rates help to measure internal (domestic) or international migration to and from a particular region or country. The crude net migration rate (CNMR) is the net number of migrants in a year per 1,000 people in a particular population. It is calculated as the difference between the net in- and out-migration rates.

Things You'll Need

  • Calculator
  • Find the net in-migration rate, also known as crude rate of in-migration, the ratio of all migrants who moved into the region (IM) during a given year relative to the total midyear population (p) in the region. Multiply that number by 1,000 to arrive at the crude rate of immigration:

    IMR = (IM/p)*1000

  • Find the net out-migration rate (OMR), also known as crude rate of out-migration, the ratio of all migrants who moved out of the region (OM) during a given year relative to the total midyear population (p) in the region. Multiply that number by 1,000 to arrive at the crude rate of out-migration:

    IMR = (OM/p)*1000

  • Subtract the OMR from the IMR to get the crude net migration rate (CNMR).

  • For example, say your country has 50,000,000 people. In a particular year, the country received 250,000 immigrants (in-migrants) and lost 55,000 emigrants (out-migrants). The crude net migration rate would be 3.9 migrants per 1,000 people:

    [(250,000/50,000,000) x 1,000] - [(55,000/50,000,000) x 1,000] = 5 - 1.1
    CNMR = 3.9 migrants per 1,000 people

Tips & Warnings

  • CNMR = IMR-OMR
  • CNMR = [(IM/p)1000] - [(OM/p)1000]
  • CNMR = [(250,000/50,000,000)1,000] - [(55,000/50,000,000)1,000]
  • CNMR = 5 - 1.1
  • CNMR = 3.9 migrants per 1,000 people

References

  • Photo Credit Digital Vision/Digital Vision/Getty Images
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