Economics • Income Distribution

Lorenz Curve & Gini Coefficient Simulator

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Load a country's GDP, population and Gini coefficient — or set your own — and watch the Lorenz curve bow away from the line of perfect equality. Then see exactly how many dollars, on average, someone in each 10% of the population would receive — for Cambridge International AS/A Level Economics and NCEA Level 2/3 Economics.

GDP and population are shown in each country's own currency; edit them to explore your own scenario.

Lorenz Curve

Cumulative Share of Income vs. Cumulative Share of Population
0% 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% Perfect equality Cumulative Share of Population Cumulative Share of Income
0.33
Gini Coefficient

Gini Coefficient

A Gini of 0.33 indicates low income inequality, similar to some of the more equal developed economies.

Area A: the inequality gap
Area B: income actually held

Gini = A ÷ (A + B). The more the Lorenz curve bows away from the diagonal, the bigger Area A is relative to Area B, and the higher the Gini coefficient.

Average Income by Population Decile

How GDP, population and the Gini coefficient split total income across ten equal-sized 10% population groups
Poorest — Richest Scale: 0–100% Equal share (10%)

Lorenz Curve & Gini Coefficient Simulator — Key Terms

Key concepts and translations across English, te reo Māori, Simplified Chinese (中文) and Korean (한국어).

EnglishTe reo Māori中文（简体）한국어What it means on this page

On the te reo Māori column. Terms marked as gaps have no attested equivalent in the sources checked — Karaitiana Taiuru's Dictionary of Māori Computer and Social Media Terms, Paekupu, the Reserve Bank's te reo financial glossary and Te Aka. No coinage is printed as though it were established; where a class needs one, commission it from Te Taura Whiri i te Reo Māori and credit the translator. Te reo Māori is not italicised and takes no plural "s".