Analysis guide
Age Dependency Ratio, Explained
Learn how child, old-age, and total dependency ratios are calculated, what they reveal, and where the measure can mislead.
The age dependency ratio compares people in age groups conventionally described as dependent with the population of conventional working age. It translates a population pyramid into a compact measure of age balance.
The standard total ratio is:
(population aged 0–14 + population aged 65+) ÷ population aged 15–64 × 100
A result of 55 means there are 55 people under 15 or aged 65+ for every 100 people aged 15–64.
The three related ratios
| Measure | Numerator | Denominator |
|---|---|---|
| Child dependency | Ages 0–14 | Ages 15–64 |
| Old-age dependency | Ages 65+ | Ages 15–64 |
| Total dependency | Ages 0–14 and 65+ | Ages 15–64 |
Separating the child and old-age components matters. Two countries can have the same total ratio while facing very different needs: one may have a large school-age population, the other a large retired population.
A worked example
Suppose a population contains 24 million children, 64 million people aged 15–64, and 12 million people aged 65 or older.
- Child dependency: 24 ÷ 64 × 100 = 37.5
- Old-age dependency: 12 ÷ 64 × 100 = 18.75
- Total dependency: 36 ÷ 64 × 100 = 56.25
The total is about 56 dependants per 100 working-age people.
What the ratio helps reveal
A high child ratio can indicate strong demand for schools, maternal and child health services, and future job creation. A rising old-age ratio can signal greater pension, healthcare, and long-term-care needs. A falling total ratio may open a period in which the working-age share is especially large—sometimes called a demographic dividend.
That dividend is not automatic. It depends on education, health, jobs, institutions, and whether people can participate productively in the economy.
The measure’s biggest limitation
Age is only a proxy for economic dependency. Many 15–64-year-olds are students, unemployed, unable to work, or doing unpaid care. Many people over 65 remain in paid work or support others. Children and older adults also require different resources.
The ratio should therefore be read as demographic pressure, not a literal count of dependants per worker. Economic dependency ratios based on employment or consumption answer different questions.
How this site calculates it
We sum the UN’s five-year age groups into 0–14, 15–64, and 65+. The value shown on each profile is calculated from the unrounded counts, then rounded to one decimal place. You can reproduce custom bands with the age-group calculator.
Sources
Frequently asked questions
What does a dependency ratio of 50 mean?
It means there are 50 people in the conventionally dependent age groups for every 100 people aged 15–64. It does not mean exactly half of workers support one dependant each.
How is the old-age dependency ratio calculated?
Divide the population aged 65 and older by the population aged 15–64, then multiply by 100.
Is a lower dependency ratio always better?
No. The ratio is an age-structure measure, not a welfare score. Employment, productivity, health, care systems, education, and household arrangements all affect its meaning.