Find the gap between actual and potential GDP.
Please do not make financial decisions based on these results.
What is the GDP Gap Calculator?
Find the gap between actual and potential GDP. To use the GDP Gap Calculator, enter actual gdp, potential gdp; it returns gdp gap, gap as % of potential, 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 Gap Calculator
- Fill in the fields. You will need Actual GDP ($ billions), Potential 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 gap, and the cards below show Gap as % of potential. 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 Gap Calculator using the default values shown in the calculator above:
Inputs
| Actual GDP ($ billions) | 28,500 |
|---|---|
| Potential GDP ($ billions) | 29,000 |
Results
| GDP gap | -$500.00 |
|---|---|
| Gap as % of potential | -1.72% |
With these inputs the calculator returns GDP gap: -$500.00. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Actual GDP ($ billions) from 28,500 to 34,200 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| GDP gap | -$500.00 | $5,200.00 | +1140% |
| Gap as % of potential | -1.72% | 17.93% | +1140% |
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 Gap Calculator reports GDP gap and gap as % of potential. 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
What does a negative gap mean?
The economy is operating below capacity, often with high unemployment.
What is the difference between nominal and real GDP?
Nominal GDP uses current prices; real GDP removes price changes using a deflator so output can be compared over time.
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.
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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- Buying Power Calculator
- CPI Inflation Calculator – Consumer Price Index
- Spending Multiplier Calculator
- Money Multiplier Calculator
- Reserve Ratio Calculator
- Comparative Advantage Calculator
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