Real Return Calculator

Calculate real rate of return, inflation-adjusted investment value and required nominal return.

Convert a nominal annual return into an inflation-adjusted real rate using the exact Fisher relationship.

Result

Real annual return4.8544%

Simple subtraction approximation5.0000%

The exact inflation-adjusted annual return is 4.8544%. A negative real return means purchasing power falls, even if the nominal return is positive.

Nominal return and inflation must cover the same annual period. The exact Fisher relationship differs from simple subtraction. Negative real return means purchasing power falls despite possible nominal gains. Enter your own rates; no historical data is fetched.

How to use this calculator

Convert a nominal annual return into an inflation-adjusted real rate using the exact Fisher relationship. Enter amounts in the units shown, select the applicable options, and click Calculate. Use Reset to restore the starting values.

Calculation formula

Real return = (1 + nominal return) / (1 + inflation) − 1.

Assumptions and accuracy

Review timing, rates, fees and result notes when comparing scenarios. Future returns and rates are assumptions rather than guaranteed outcomes. Monetary display follows the currency’s precision; intermediate calculations retain additional digits.

Choose what to calculate

Real rate of return calculator

Convert nominal returns into real returns with the exact Fisher relationship. Estimate inflation-adjusted future value and required nominal return using your own inflation assumptions, without relying on external economic data.

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Understanding this calculation

Worked examples

8% nominal return and 3% inflation

nominal: 8; inflation: 3

Divide 1.08 by 1.03.
Subtract 1 to get 0.0485436893, or 4.8544%.

Real annual return: 4.854369

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Ten-year purchasing power at matching rates

principal: 10000; nominal: 3; inflation: 3; years: 10; tax: 0

Nominal growth and inflation both compound at 3%.
The ratio 1.03/1.03 is 1, preserving the initial 10,000 purchasing power.

Future value in today’s purchasing power: 10,000

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Common questions

Why not simply subtract inflation from return?

Nominal return minus inflation is an approximation. The exact real return is (1 + nominal return)/(1 + inflation) − 1. At 8% return and 3% inflation it is about 4.8544%, not 5%.

What is nominal vs real rate of return?

Nominal return measures change in currency amounts. Real return adjusts for inflation and measures purchasing-power change. Positive nominal growth can still produce a negative real return.

Can I calculate after-tax real return?

In Purchasing Power mode, enter an assumed tax rate on positive annual gains. The model applies that tax each year before inflation adjustment and gives no loss credit. It does not model deferred tax or actual tax law.

Scope and assumptions

Annual return and inflation inputs refer to the same period and exceed −100%. Value mode holds both rates constant without deposits. Optional tax is a simplified annual charge on positive nominal gains, not a jurisdiction-specific capital-gains model. Historical purchasing-power comparisons belong in Inflation Calculator.

Sources

Independent model implementation and documented equations

Calculation notes checked October 21, 2026. Examples are mathematical checks under the stated assumptions.

Calculation methods and formulas

Real Return

Convert a nominal annual return into an inflation-adjusted real rate using the exact Fisher relationship.

Real return = (1 + nominal return) / (1 + inflation) − 1.

Purchasing Power

Estimate the future purchasing power of an investment under constant return, inflation and an optional simplified annual tax rate.

After-tax rate = nominal − max(nominal, 0) × tax; real value = principal × ((1 + after-tax rate) / (1 + inflation))^years.

Required Nominal Return

Find the nominal annual return needed for a target real return at an entered inflation rate.

Nominal = (1 + real return) × (1 + inflation) − 1.

See our calculation methodology and review status for data versions, rounding and validation limitations.