Real GDP Calculator — GDP Deflator & Growth Rate
Strip inflation from GDP figures to compare economic output across years. Enter nominal GDP and the GDP deflator to get real GDP at base-year prices, plus the real growth rate if you supply last year's figure.
GDP expressed in base-year prices, stripping out inflation
- 1
Deflator as price index ratio
115 ÷ 100 = 1.15Expresses the deflator as a multiplier relative to the base year. - 2
Real GDP
25,000 ÷ 1.15 = 21,739.13
How does this calculator work?
Real GDP = Nominal GDP ÷ (GDP Deflator / 100). If the deflator is 115, prices are 15% higher than the base year, so real GDP is roughly 13% below the nominal figure. Real growth rate compares two years of real GDP: (Real₂ − Real₁) / Real₁ × 100.
Formula
How this is calculated
Nominal GDP measures the total value of goods and services produced using current-year prices, so it rises whenever either output or prices increase. Real GDP adjusts for that price change by dividing by the GDP deflator — a price index that compares the current year's price level to a chosen base year (where the deflator = 100). A deflator of 115 means prices are 15% higher than in the base year; dividing nominal GDP by 1.15 gives you the equivalent output in base-year dollars, euros, etc.
The result lets economists and policymakers answer the question that nominal GDP cannot: did the economy actually produce more, or did it just get more expensive? Two countries or two years can only be meaningfully compared once inflation is removed.
If you supply the real GDP from the previous year, the calculator also shows the real growth rate — the metric most closely watched in business cycles and central bank policy. This calculator uses the deflator method; note that statisticians also compute real GDP via the expenditure approach using chained price indexes, which can produce slightly different figures.
Frequently asked questions
Nominal GDP is measured in current prices; it rises when either the economy grows or prices rise. Real GDP is adjusted for inflation using a price deflator, so it only rises when actual output increases — making it the better measure of economic growth.
National statistical agencies publish GDP deflator series — for the US, the Bureau of Economic Analysis (BEA); for the EU, Eurostat; for the UK, the ONS. The base year (deflator = 100) is periodically updated and varies by country.
They are closely related and often used interchangeably. "Constant prices" GDP fixes the price index to a single base year; modern real GDP series use chain-weighting, which links successive years to reduce substitution bias. Both strip out inflation — the differences are methodological.
Also known as
TG we-Calculate Editorial Team. (2026). Real GDP Calculator — GDP Deflator & Growth Rate [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/real-gdp-calculator
TG we-Calculate Editorial Team. "Real GDP Calculator — GDP Deflator & Growth Rate." TG we-Calculate. 2026. https://we-calculate.com/calculator/real-gdp-calculator.
TG we-Calculate Editorial Team, "Real GDP Calculator — GDP Deflator & Growth Rate," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/real-gdp-calculator
@misc{wecalculate_real_gdp_calculator, title = {Real GDP Calculator — GDP Deflator & Growth Rate}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/real-gdp-calculator}}, year = {2026}, note = {TG we-Calculate} }
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