The Gini Coefficient: US vs. 6 Peer Nations

People argue about inequality as if it were a matter of taste. The Gini coefficient turns it into a number you can compare across countries and across decades. If you have ever wondered what is the Gini coefficient and why economists lean on it, the answer is simple, and so is what it says about the United States.

What is the Gini coefficient and how is it calculated?

Picture lining up every household from poorest to richest and plotting the running share of income they hold. Perfect equality would be a straight diagonal line. Real life bows below it. The Gini coefficient measures the area between the diagonal and the actual curve, scaled from 0 to 1.

• 0.0 means every household has the same income.
• 1.0 means one household has all of it.
• Real countries fall between roughly 0.25 and 0.60.

You do not need the calculus. You only need the direction: higher means more unequal.

One wrinkle matters. Agencies report the Gini before taxes and transfers (market income) or after them (disposable income). The Census Bureau's headline U.S. figure is a pre-tax money income measure near 0.48 to 0.49. International comparisons from the OECD use after-tax disposable income, where the U.S. falls near 0.39. Comparing across those two types gives nonsense, so always check which one you are reading.

How does the U.S. Gini compare with other rich countries?

Using OECD disposable-income measures, rounded:

The U.S. sits above every peer on the list. It is not the most unequal country in the world, but among wealthy democracies it is the outlier.

Why is the U.S. Gini higher than its peers?

Look at what happens before and after government acts. Many European countries have market incomes nearly as unequal as ours. They end up with lower Gini scores because taxes and transfers do more to level the result: stronger child benefits, subsidized childcare, universal healthcare, and unemployment support. The U.S. redistributes less, so more of the market outcome sticks.

Our market income is also more skewed at the top. Pay for executives and capital owners has climbed faster than pay for typical workers, with the CEO-to-worker ratio at large firms running roughly 290 to 340 to 1 (EPI). And the floor under pay is low: the federal minimum wage has stayed at $7.25 an hour since 2009 (U.S. Dept. of Labor).

How has the U.S. Gini changed over time?

The Census Bureau's measure has risen from about 0.40 in 1967 to roughly 0.48 to 0.49 today. That is a large move for a statistic that usually changes slowly. Most of the rise happened from the late 1970s through the 1990s, and the index has stayed high since. Our explainer on income inequality in five numbers shows what that looks like in dollars.

What does the Gini not tell you?

Three limits worth knowing.

1. It measures income, not wealth. Wealth is far more concentrated. The Federal Reserve estimates the top 1% hold roughly 30% of U.S. household net worth.
2. It can hide the cause. Two countries can share a Gini with very different distributions.
3. It misses the top. Survey data under-count the highest earners, so tax-record studies, covered in top 1 percent income share and billionaire wealth growth, fill the gap.

The number also says nothing about whether a household can afford rent. A country can have a moderate Gini and still shut workers out of housing, as the home price now at roughly 5 times median income shows (NAR; U.S. Census).

What should you take from it?

Use the Gini as a thermometer, not a diagnosis. It tells you the country is running hot compared with its peers. For the diagnosis, read our pillar on income inequality in America and the broader case in the American dream is broken.

How does the Gini coefficient relate to everyday life?

A Gini score is abstract until you attach it to a budget. Move from 0.30 to 0.39 and the practical difference is large: more households far below the median, more far above, and a thinner middle. In a high-Gini country, the households at the bottom depend more on whatever the market pays, because public benefits are smaller.

That matters most for costs that cannot be shopped around. Full-time center-based childcare commonly runs $10,000 to $17,000+ per year per child (Child Care Aware), and family health insurance premiums average roughly $25,000 a year (KFF, 2024). In countries with lower Gini scores, governments cover a large portion of these costs. In the U.S., families cover them from wages, which makes inequality in pay into inequality in security.

Does a lower Gini mean a poorer country?

No. The idea that equality and prosperity trade off sharply does not hold across rich democracies. Denmark, Germany, and Canada have higher living standards by many measures, including life expectancy, and much lower Gini scores than the United States. They also have unions with more bargaining power, higher wage floors, and larger public benefits. The evidence does not show that a flatter distribution makes everyone poorer. It shows that the U.S. could pick a different distribution without collapsing.

Which Gini number should you trust?

Trust the one that matches your question and say which it is. If you want to know how unequal the market is, use pre-tax income. If you want to know how much a government evens out the result, compare pre-tax and post-tax Gini for the same country. The size of that drop is the best simple measure of how much a government redistributes. Countries like Germany and France cut their Gini sharply through taxes and transfers. The U.S. cuts it by far less. That difference, not a difference in the markets themselves, accounts for much of the gap in the chart above.

Be wary of a single-number headline. The index can stay flat while the top pulls away and the bottom improves, or the reverse. Pair it with shares of income by group, which show who gains and who loses, and with a look at wealth, where concentration is steeper.

Countries with lower Gini scores did not get there by accident or by cultural virtue. They chose public childcare, universal health coverage, higher wage floors, and tax systems that move money downward. The U.S. made different choices, and the Gini is the receipt.