Nominal return measures growth in money before adjusting for inflation. Real return measures growth in purchasing power: how much more, or less, the money can buy after prices change. An account can grow in dollars while making less progress toward the things you want to pay for.
In this guide, real return means inflation-adjusted return before a separate tax adjustment. Some providers also deduct taxes when describing a real return, so check their definition.
Key takeaways
Real return = (1 + nominal return) ÷ (1 + inflation rate) − 1
Enter the rates as decimals: 8% becomes 0.08 and 3% becomes 0.03. Multiply the result by 100 to express it as a percentage. The relationship compares how fast the balance grew with how fast prices rose over the same period.
Simply subtracting inflation gives a rough estimate when rates are small. It does not give the exact result. The calculation also needs a meaningful inflation factor: 1 plus the inflation rate must be positive.
Assume, purely for illustration, that $1,000 earns an 8% nominal return over one year and prices rise 3% over that same year. Ignore taxes, fees, and any money added or withdrawn.
The account ends at $1,080. Divide $1,080 by 1.03 to express it in starting-year buying power: it is worth about $1,048.54 in starting-year dollars. Purchasing power grew by about $48.54, or 4.85%.
The rate formula gives the same answer: 1.08 ÷ 1.03 − 1 ≈ 4.85%. Subtracting 3% from 8% would give 5%, a useful approximation here but a different figure. The account statement still shows $1,080; the inflation adjustment changes how we interpret what that balance can buy.
If prices rise faster than the account grows, real return is negative even when nominal return is positive. For example, 2% growth with 3% inflation gives 1.02 ÷ 1.03 − 1, about −0.97% in real terms over the same year. A balance that stays unchanged also loses purchasing power when prices rise.
Inflation is commonly measured using a basket of goods and services. Your own costs may change at a different pace. Housing, healthcare, education, and other spending can make your experience different from a broad inflation measure.
Use the same period for the investment return and the inflation rate. For several years, compare cumulative growth with cumulative inflation, or use matching annualized rates. Do not adjust a five-year total gain using just one year’s inflation.
Inflation adjustment is separate from including dividends. A return can include dividends and still be nominal. Read price return versus total return for that distinction. Fees and taxes can reduce what you keep and need their own assumptions.
The financial-independence calculator lets you explore inflation and the difference between today’s dollars and future dollars. Read its dollar-basis labels before comparing results. Avoid subtracting inflation again from a result already shown in today’s dollars.
Some tools also use “nominal annual rate” to describe a compounding convention, such as an annual rate divided across monthly periods. That use of nominal is different from the inflation comparison in this guide. Check both the rate convention and the dollar-basis label.
The examples use fixed assumptions to explain the calculation. Actual returns and inflation vary. For related concepts, see compound growth and annualized investment growth.
For general education only. Nothing here is investment advice.
References explain the concepts; MarketCapLens supplies the examples and calculator assumptions. See who checks the numbers.