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fin.Lorenz-Gini-coefficient Calculator
Calculates the Gini coefficient from quintile income shares and plots the Lorenz curve vs. the equality line. Income quintile data is publicly available from the Census Bureau — the Gini coefficient is the single most widely cited inequality statistic.
Inputs
Income Q1 Pct
Reference formula or conversion factor shown for context.
Income Q2 Pct
Reference formula or conversion factor shown for context.
Income Q3 Pct
Reference formula or conversion factor shown for context.
Income Q4 Pct
Reference formula or conversion factor shown for context.
Income Q5 Pct
Reference formula or conversion factor shown for context.
Results
Gini coefficient
Sample size or count used in the calculation.
Lorenz curve area
The computed two-dimensional surface area.
quintile income shares normalised
Sample size or count used in the calculation.
Gini = 1 − 2·Area(Lorenz curve)
The computed two-dimensional surface area.
inequality classification
Category assigned based on where the computed value falls on a defined scale. Check which standard or guideline defines these boundaries.
perfect equality Gini
A qualitative assessment of how the result compares to the desired standard or benchmark.