What is the GDP deflator?

The GDP deflator is a measure of the price level of all domestically produced goods and services in an economy. It is calculated as (Nominal GDP / Real GDP) × 100 and expressed as an index relative to a base year where the deflator equals 100.

How is the GDP deflator different from CPI?

The CPI measures prices for a fixed basket of consumer goods and services. The GDP deflator covers all goods and services produced domestically, including investment goods and government expenditures, and the basket adjusts automatically with output composition.

What does a GDP deflator of 110 mean?

A deflator of 110 means the overall price level is 10% higher than in the base year. To get real GDP you divide nominal GDP by 1.10 (or multiply by 100/110).

How do I calculate the inflation rate from the GDP deflator?

Inflation rate = ((Deflator₂ − Deflator₁) / Deflator₁) × 100. For example, if the deflator rose from 100 to 108 the inflation rate is 8%.

Can the GDP deflator be below 100?

Yes. A deflator below 100 indicates that the price level is lower than in the base year, which is known as deflation.

GDP Deflator Calculator

Name: GDP Deflator Calculator
Availability: InStock
Author: Nham Vu

Enter nominal and real GDP to calculate the GDP deflator, or use the deflator to find real or nominal GDP. Supports multi-year analysis and period-over-period inflation.

Calculate GDP Deflator

Formula: Deflator = (Nominal GDP / Real GDP) × 100

Nominal GDP

Real GDP

Multi-Year GDP Deflator Analysis

Enter up to 5 years of Nominal and Real GDP data to compute deflators and year-over-year inflation.

Year	Nominal GDP	Real GDP

Results

Year	Nominal GDP	Real GDP	Deflator	YoY Inflation

Summary

Enter nominal and real GDP to calculate the GDP deflator, or use the deflator to find real or nominal GDP. Supports multi-year analysis and period-over-period inflation.

How it works

Choose a calculation mode: find the deflator, real GDP, or nominal GDP.
Enter the two known values for your chosen mode.
Results appear instantly — deflator, inflation rate, and interpretation.
Switch to the Inflation Rate tab to compare deflators between two periods.
Use the Multi-Year Analysis tab to enter up to 5 years of data and view deflators and year-over-year inflation in a table.

Use cases

Converting nominal GDP figures to inflation-adjusted real GDP.
Measuring economy-wide price inflation between two years.
Comparing price levels across countries or time periods.
Macroeconomics coursework and homework problems.
Analyzing historical GDP data from government statistical agencies.
Verifying textbook sample calculations for GDP accounting.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu