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Nominal-to-Real GDP Price Index Calculator

Calculate an implicit GDP price index with a base value of 100.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

Divide nominal GDP by real GDP and multiply by 100. Nominal output of 1,200 compared with real output of 1,000 produces a GDP deflator of 120.

GDP deflator = nominal GDP ÷ real GDP × 100

Worked example

Enter these known values and leave the other values blank.

Nominal GDP
1200 USD · million
Real GDP
1000 USD · million
GDP deflator
120

Assumptions and limitations

  • Use values from a consistent period, scope and currency. The stated formula defines this simplified model; the explanation describes quantities it leaves out.

Common questions

Does a deflator of 120 mean inflation was 20% this year?

It indicates prices 20% above the series base under this index convention. Annual inflation requires comparison with the previous year’s deflator, not just the base of 100.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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