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Per capita means “per person.” A per-capita figure is calculated by dividing a total for a defined group or place by the population of that same group or place. It gives an average for the measure and period—not a description of what each person actually receives, earns, or experiences.
How do you calculate per capita?
Use this formula:
Per-capita amount = total amount ÷ population
For a simple illustration, suppose a group has 120 units in total and 30 people. The per-capita amount is 4 units per person. This example explains the arithmetic; it is not a reported statistic.
For a real figure, the total and population must cover the same group or area. The U.S. Census Bureau, for example, defines per-capita income as a group’s total income divided by its population. The Census Bureau’s CPS glossary also specifies which people are included in the population for that particular measure.
What does “per capita” measure?
The phrase describes how a total is divided; it does not identify the total itself. The measure named before or after it supplies the numerator. Per-capita figures can refer to income, economic output, spending, cases, or another quantity.
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Per-capita income
Per-capita income is a group’s total income divided by its population. In its Current Population Survey definition, the Census Bureau describes the calculation as an average for every person and excludes institutional patients or inmates from the population used in that context. That coverage rule belongs to this Census definition; it should not be assumed to apply to every dataset.
GDP per capita
GDP per capita divides gross domestic product by population. The World Bank’s World Development Indicators glossary defines its measure using midyear population. Its constant-price series is expressed in constant 2015 US dollars, which adjusts for price changes using 2015 as the reference year. This is an output-per-person average, not a resident’s salary or the amount each person receives. See the World Bank’s GDP-per-capita metadata.
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State and county per-capita personal income
The Bureau of Economic Analysis (BEA) calculates state and county per-capita personal income by dividing residents’ total personal income by the area’s population. Its figures rely on population estimates for the relevant geography and defined estimate periods. BEA’s note on per-capita personal income and population explains its population inputs; its state definitions and county definitions describe the corresponding calculations.
What a per-capita average can—and cannot—tell you
A per-capita figure answers a narrow question: how large is a total relative to the population counted? It makes totals easier to compare across groups or places of different sizes, provided the underlying measures are comparable.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteIt does not show how the total is distributed. An average can be much higher than what many individuals experience if a smaller number of people account for a large share of the total. Per capita is not the same as median, “typical,” or an amount paid to each person.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to check before comparing per-capita figures
- What is the total? GDP, personal income, government spending, and other aggregates are different measures, even when each is stated per person.
- Who and what area are counted? Check the population coverage, geographic boundaries, and whether the denominator uses a midyear, mid-quarter, or another estimate.
- What period does the figure cover? Annual and quarterly measures may use different period conventions; do not compare them without checking how each is defined.
- What are the price basis and currency? Current-price values reflect prices in the period measured. Constant-price values adjust for price changes and should identify a reference year. These series answer different comparison questions.
- Is the average being mistaken for an individual’s outcome? A per-capita quotient does not disclose the distribution of income, output, or another total among people.
For example, the BEA’s state and county calculations use population estimates tied to the relevant geography and estimate periods, while the World Bank metadata for GDP per capita specifies midyear population. Check the definition attached to the particular series rather than assuming all denominators are identical.
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For another official explanation of per-capita figures at current and constant prices, see the Philippine Statistics Authority FAQ.
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