---
title: "Dependency Ratio: Definition & Formula | Model Diplomat"
description: "The dependency ratio measures the number of dependents per 100 working-age individuals, crucial for understanding economic support ratios in demographics."
url: "https://modeldiplomat.com/learn/glossary/dependency-ratio"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- The dependency ratio is the number of people aged under 15 and over 64 expressed per 100 persons of working age, 15 to 64.
- How is the dependency ratio calculated?
- What is the difference between the dependency ratio and the demographic dividend?
- Why is the age-based dependency ratio considered an imperfect measure?
- Why does a falling dependency ratio matter for India?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

The dependency ratio is the number of people aged under 15 and over 64 expressed per 100 persons of working age, 15 to 64.

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### Supporters

The procedural mechanics are arithmetic and transparent. The total dependency ratio is computed by summing the population aged 0–14 and the population aged 65 and over, dividing that sum by the population aged 15–64, and multiplying by 100. A ratio of 50, for example, indicates that every 100 working-age persons support 50 dependants. The figure is conventionally disaggregated into two components. The child dependency ratio isolates the 0–14 cohort over the 15–64 cohort, while the old-age dependency ratio places the 65-and-over cohort over the same denominator. The two component ratios sum to the total, which permits analysts to attribute movements in the overall figure to either declining fertility, which shrinks the child component, or rising longevity, which inflates the old-age component.

### Opponents

For the working practitioner, the dependency ratio is a first-order input into fiscal, pension, and development policy rather than an academic abstraction. Desk officers assessing a country's medium-term stability read a rising old-age ratio as a signal of mounting pension and healthcare liabilities and constrained labour supply, while a falling total ratio flags a potential growth window that hinges on employment policy. Diplomats negotiating migration, trade, and development frameworks use the indicator to identify structural complementarities—ageing capital-rich economies seeking labour against young labour-surplus economies. Read alongside fertility, participation, and education data, the ratio remains an indispensable shorthand for the demographic pressures shaping national budgets and foreign-policy posture across the coming decades.

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In the early 2020s Japan's Ministry of Health, Labour and Welfare reported an old-age dependency ratio above 50, meaning fewer than two working-age people supported each resident aged 65 and over.

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