Dependency Ratio

What Is a Dependency Ratio?

A dependency ratio compares people who are generally not in the workforce with people who are. Economists and demographers use it to gauge how much economic support a population's working members may need to provide for those who depend on them. The ratio usually counts children under 15 and adults 65 and older as dependents, and people aged 15 to 64 as the working-age base. Age cutoffs vary between sources, so comparing figures requires checking the definitions used.

How It Is Calculated

Dependency Ratio = (Population Aged 0–14 + Population Aged 65 and Over) ÷ Population Aged 15–64

The result is often multiplied by 100 and expressed as dependents per 100 working-age people. A ratio of 50, for example, means there are roughly 50 dependents for every 100 people of working age. Some analysts split the measure into a youth dependency ratio, which counts only children, and an old-age dependency ratio, which counts only older adults. This separation shows whether the pressure comes from a young or an aging population.

Why It Matters to Investors

Changes in the ratio can influence the economic outlook. A rising ratio may mean more spending on pension systems and healthcare, and a smaller tax base where a pay-as-you-go pension or public program relies on current workers' contributions. Governments facing these pressures may respond with fiscal policy changes, which can affect public debt levels. Conversely, a falling ratio is sometimes associated with a demographic dividend, a period when more workers relative to dependents may support higher output per person, though outcomes depend on job creation and productivity.

The ratio is a simple tool with limits. It counts age rather than actual employment, so it ignores retirees who still work and working-age adults who are unemployed or in school. Analysts therefore often pair it with labor force participation rate data for a fuller picture.