Gini Coefficient Calculator - Income Inequality
Calculate the Gini coefficient to measure income or wealth inequality within a population. Economics calculator for social science, public policy, development economics, and statistics. Produces Lorenz curve data and inequality index from 0 (perfect equality) to 1 (perfect inequality).
Gini Coefficient
G = A / (A + B)Variables:
- GGini coefficient (0-1)Gini coefficient (0-1)
- AArea between the equality line and Lorenz curveArea between the equality line and Lorenz curve
- BArea under the Lorenz curveArea under the Lorenz curve
How to Use
- 1
Enter Income Data
Enter population income data sorted in ascending order.
- 2
Calculate Cumulative Values
The system calculates cumulative percentages.
- 3
Calculate Gini
Get the Gini value (0 = perfect equality, 1 = perfect inequality).
Examples
Simple Example
Problem:
Population: 5 people with incomes [10, 20, 30, 40, 50]. Find G?
Solution:
- 1.Calculate cumulative income
- 2.Plot Lorenz curve
- 3.Calculate area
Result:G ≈ 0.267
A Gini value of 0.267 indicates relatively low inequality.
Frequently Asked Questions
What does Gini = 0 mean?
Perfect equality — everyone has the same income.
What is Indonesia's Gini coefficient?
Based on national statistics, Indonesia's Gini ratio is approximately 0.38–0.39 (2023).