Nominal GDP can rise just because prices rise. Real GDP measures the volume of goods and services produced, so it’s the measure used for economic growth.
How to use the Real GDP Calculator
- Nominal GDP
- GDP deflator (base year = 100)
- Last year’s real GDP
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter nominal GDP and the GDP deflator, and last year’s real GDP for growth.
Tips
- Use real (inflation-adjusted) figures to compare across years.
- Check whether data are seasonally adjusted.
- Use the same currency and base year throughout.
- Economic models simplify reality – treat results as illustrations, not forecasts.
Common mistakes to avoid
- Mixing nominal and real values.
- Comparing percentage changes with percentage-point changes.
- Treating correlations as causes.
Inputs explained
| Field | What to enter |
|---|---|
| Nominal GDP | Amount in your currency |
| GDP deflator (base year = 100) | A number |
| Last year’s real GDP | Amount in your currency |
What each result means
- Real GDP = [Nominal GDP]÷[GDP deflator (base year = 100)]×100
- Real GDP growth = ([Real GDP]÷[Last year’s real GDP] – 1)×100
Example values
How the main result changes when Nominal GDP changes and everything else stays at the example values above:
| Nominal GDP | Real GDP |
|---|---|
| 14,500 | 11,553.78 |
| 21,750 | 17,330.68 |
| 29,000 | 23,107.57 |
| 36,250 | 28,884.46 |
| 43,500 | 34,661.35 |
| 58,000 | 46,215.14 |
Formula
Real GDP = nominal GDP ÷ deflator × 100Real growth = (real GDP this year ÷ real GDP last year − 1) × 100Worked example
Inputs — Nominal GDP: $29,000; GDP deflator (base year = 100): 125.5; Last year's real GDP: $22,700.
Results — Real GDP = $23,107.57; Real GDP growth = 1.8 %.
Frequently asked questions
What is real GDP?
GDP adjusted for inflation, in constant prices of a base year.
How do I convert nominal to real GDP?
Divide by the deflator and multiply by 100.
Why is real GDP important?
It shows actual changes in output, not prices.
What formula does the Real GDP Calculator use?
Real GDP = nominal GDP ÷ deflator × 100.