Nominal vs Real GDP: What Is the Difference?

Nominal GDP measures a country’s output at current prices, so it rises when prices rise. Real GDP strips out inflation to show the true change in the quantity of goods and services produced. Real GDP is the better measure of economic growth; the GDP deflator converts one to the other.

Table of Contents

Nominal vs real GDP: what is the difference?

Both measure gross domestic product, the total value of everything an economy produces, but they treat prices differently. Nominal GDP uses the prices of the moment. Real GDP uses constant prices from a fixed base year, so it isolates changes in actual output (US Bureau of Economic Analysis).

	Nominal GDP	Real GDP
Prices used	Current prices	Constant (base-year) prices
Includes inflation?	Yes	No — inflation removed
Best for	Size of the economy today	Measuring real growth over time

Because nominal GDP rises with inflation, it can suggest an economy is growing when it is only prices that have gone up. Real GDP answers the more useful question: is the country actually producing more?

Close-up of a printed financial report showing growth figures and charts — Real GDP separates true output growth from price rises. Photo: Pexels.

An example, and the GDP deflator

The gap is easy to see in real data. In 2024 the US economy’s real GDP grew 2.8%, while the prices of what it produced rose about 2.4% (US Bureau of Economic Analysis). Add the two together and nominal GDP grew far faster than real output. The extra came from higher prices, not more goods. That year, US nominal GDP reached about $29.2 trillion.

Where nominal GDP growth comes from

United States, 2024: more output plus higher prices

Nominal GDP growth combines two things: more output and higher prices. Strip out the price increase measured by the GDP deflator and what remains is real growth. (1.028 × 1.024 ≈ 1.053, so nominal GDP grew about 5.3%.) Source: US Bureau of Economic Analysis (2024). Tap or click to pause.

The tool that separates the two is the GDP deflator, a price index covering everything an economy produces. Divide nominal GDP by the deflator and you get real GDP (IMF). Unlike the consumer price index, the deflator includes goods bought by businesses and governments too.

Key takeaways

Nominal GDP uses current prices; real GDP uses constant prices with inflation removed.
Real GDP is the standard measure of economic growth.
In 2024, US real GDP grew 2.8% while prices rose about 2.4% (BEA).
The GDP deflator converts nominal GDP into real GDP.

Which one should you use?

Use nominal GDP to compare the size of economies at a point in time, or to work with figures like debt-to-GDP that are measured in current dollars. Use real GDP to judge whether an economy is genuinely expanding or shrinking. When the news reports that an economy “grew” by a certain percentage, it almost always means real GDP.

Money illusion: why a pay rise can be a pay cut

The difference between nominal and real values matters for people, not just for GDP. Most of us think about money in nominal terms: a salary, a price, a bank balance. But what matters for living standards is what that money can buy. The tendency to focus on the number of dollars rather than their purchasing power is called money illusion.

Suppose your salary rises 5%, from $50,000 to $52,500. It feels like a gain. But if prices rose 7% over the same year, your new salary buys only what about $49,065 bought a year earlier. In real terms, you have taken a pay cut of about 2%.

Money illusion

A pay rise smaller than inflation is a real pay cut

A 5% raise looks like a gain in dollars, but after 7% inflation the new salary buys less than last year’s did. The real wage, what pay can buy, fell about 2%. The dashed line marks last year’s pay. Illustrative diagram, not real data. Tap or click to pause.

To convert any nominal amount into a real one, divide by the change in prices: real value = nominal value ÷ (1 + inflation rate). A quick approximation is real growth ≈ nominal growth − inflation, so 5% − 7% ≈ −2%. The same applies to interest rates: a savings account paying 4% when inflation is 6% loses purchasing power. This is exactly what real GDP does for a whole economy: it removes the effect of rising prices so that only genuine growth in output is left.

Concept check

Which is bigger, nominal or real GDP?

When there is inflation, nominal GDP is bigger, because it includes rising prices. Real GDP is lower because it strips inflation out. In rare periods of falling prices (deflation), real GDP can exceed nominal GDP.

Why use real GDP to measure growth?

Because it shows whether a country actually produced more, rather than just charging higher prices. Nominal GDP can rise purely because of inflation, which would overstate real economic progress.

What is the GDP deflator?

It is a broad price index for everything an economy produces, used to convert nominal GDP into real GDP. It is wider than the consumer price index because it also covers business and government purchases.

Sources

US Bureau of Economic Analysis, GDP 4th Quarter and Year 2024 — retrieved 2026-07-05 — bea.gov
IMF, Gross Domestic Product: An Economy’s All — retrieved 2026-07-05 — imf.org
Encyclopaedia Britannica, Gross domestic product — retrieved 2026-07-05 — britannica.com

Last updated: October 22, 2026

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Where nominal GDP growth comes from: Bar. Nominal GDP grew about 5.3% in 2024. The bar then splits into real output growth of 2.8% and a price increase (the GDP deflator) of 2.4%. Real GDP strips out the price part.

Post Author

Juan David Montoya

Economist & Senior Economic Researcher. Editorial Director of EconomicActivity.org. Specializes in macroeconomic indicators, international trade flows, and economic sector taxonomy (ISIC Rev. 4). Analyzes multilateral data from the World Bank, IMF, UN Comtrade, and OECD.