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Inflation Calculators

Real Interest Rate Calculator

Real interest rate from nominal interest and inflation using the Fisher equation — exact and approximate.

Enter values

Results update as you type.

Result

Real interest rate

3.1977%

Approximation (nominal − inflation)
3.3%

About the Real Interest Rate Calculator

Real interest rate from nominal interest and inflation using the Fisher equation — exact and approximate.

Also known as: fisher effect, real rate, nominal minus inflation.

How to use this calculator

  1. Enter nominal interest rate, expected inflation.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

1 + r = (1 + i) / (1 + π)

Worked example

Using the values pre-filled in the calculator above:

  • Nominal interest rate = 6.5 %
  • Expected inflation = 3.2 %

the calculator returns:

  • Real interest rate: 3.1977%
  • Approximation (nominal − inflation): 3.3%