Real vs Nominal Return Calculator
Convert a nominal return into a real, inflation-adjusted return using the exact Fisher equation — and see how much the quick estimate misses.
How it works
Real return = (1 + nominal) ÷ (1 + inflation) − 1 · Quick estimate = nominal − inflation
The Fisher equation links the nominal return you actually earn, the real return that reflects buying power, and inflation. Dividing the growth factors gives the exact real return; the popular shortcut of simply subtracting inflation works only when both rates are small. As returns and inflation climb, the shortcut overstates the real return, so the exact form matters for long horizons or high-inflation periods.
Worked example
With a 7% nominal return and 3% inflation, the real return is (1.07 ÷ 1.03) − 1 ≈ 3.88%. The quick estimate of 7 − 3 = 4% is close but overstates it by about 0.12 percentage points.
Sources: Fisher equation — Wikipedia
Frequently asked questions
What is the difference between real and nominal return?
Nominal return is the raw percentage your money grew; real return adjusts that for inflation to show the change in what your money can actually buy. Real return is what builds genuine wealth.
When is subtracting inflation good enough?
At low single-digit rates the error is a fraction of a percent, so subtracting is a fine mental shortcut. For high inflation, high returns, or precise long-run projections, use the exact Fisher formula.
Can real return be negative?
Yes. Whenever inflation exceeds your nominal return — for example 2% earned during 5% inflation — your real return is negative and your purchasing power shrinks.
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Educational estimate, not investment advice. Past returns do not predict future results.