Compute the GDP deflator from nominal and real GDP.
Please do not make financial decisions based on these results.
What is the GDP Deflator Formula Calculator?
Compute the GDP deflator from nominal and real GDP. To use the GDP Deflator Formula Calculator, enter nominal gdp, real gdp; it returns gdp deflator, implied price level change vs base, and shows them instantly as you type.
Reading the economy with formulas
Output first: use the GDP calculator for the expenditure approach and the Real GDP Calculator to remove inflation. Prices next: the CPI inflation calculator and Real Interest Rate Calculator show the true return on money.
For policy, the Taylor Rule Calculator suggests a rate from inflation and the output gap, and the Spending Multiplier Calculator shows how a change in spending ripples through GDP.
- Labor. Unemployment, participation, the natural rate and Okun’s law describe the job market.
- Money. Money multiplier, reserve ratio, money supply and velocity explain monetary conditions.
- Trade and currency. PPP, interest rate parity, cross rates and carry trades link currencies and prices.
How to use the GDP Deflator Formula Calculator
- Enter your numbers. Start with Nominal GDP ($ billions), Real GDP ($ billions). Use real figures from your own records where you can. Fields marked optional can stay at zero.
- Read the result. The highlighted box gives the GDP deflator, and the cards below show Implied price level change vs base. Tables and charts break it down further.
- Test other scenarios. Results update as you type. Change one value at a time to see what drives the answer, and press Reset to go back to the defaults.
Formula and how it works
Example with real numbers
Here is the GDP Deflator Formula Calculator using the default values shown in the calculator above:
Inputs
| Nominal GDP ($ billions) | 29,000 |
|---|---|
| Real GDP ($ billions) | 23,000 |
Results
| GDP deflator | 126.1 |
|---|---|
| Implied price level change vs base | 26.09% |
With these inputs the calculator returns GDP deflator: 126.1. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Nominal GDP ($ billions) from 29,000 to 34,800 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| GDP deflator | 126.1 | 151.3 | +20% |
| Implied price level change vs base | 26.09% | 51.3% | +96.7% |
The input that moves the result most is the one to check twice. Change it in the calculator above to test your own case.
What the results tell you
The results panel of the GDP Deflator Formula Calculator reports GDP deflator and implied price level change vs base. Compare these figures while changing one input at a time, and use the related calculators below to look at the same situation from another angle.
Method and limits. This calculator applies the formula in the section above to your inputs, in your browser; nothing you enter is stored on our servers. The result is only as accurate as the numbers you enter and the formula shown above. It is for information, not financial, tax or legal advice.
Frequently asked questions
How is the deflator different from CPI?
It covers all domestic output, not just a basket of consumer goods.
What is the spending multiplier?
It is 1 divided by one minus the marginal propensity to consume, so an MPC of 0.8 gives a multiplier of 5.
Where do the economic inputs come from?
Use official sources such as the BEA, BLS, Federal Reserve, IMF or World Bank for GDP, CPI, unemployment and money supply figures.
Are the results guaranteed?
No. Results depend entirely on the numbers you enter and the formulas shown on this page. Please do not make financial decisions based on them alone; confirm important figures with a licensed professional.
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