# Nominal vs. Real Returns: Allowing for Inflation > Learn how inflation changes purchasing power, how to calculate an inflation-adjusted return, and how to read today’s-dollar planning assumptions. Source: MarketCapLens — https://www.marketcaplens.com/learn/nominal-vs-real-returns Published: 2026-11-11 Updated: 2026-11-11 **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** - Nominal growth describes the change in dollars; real growth allows for changing prices. - The exact adjustment divides growth by inflation, rather than simply subtracting the rates. - Both rates must cover the same period and currency. - A planning assumption is not a forecast of your actual purchasing power. ## The inflation adjustment > **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. ## A one-year example 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 Ignore taxes, fees, and any money added or withdrawn.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. ## A growing balance can lose purchasing power 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. ## Keep the periods and assumptions consistent 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](https://www.marketcaplens.com/learn/price-return-vs-total-return) for that distinction. Fees and taxes can reduce what you keep and need their own assumptions. ## How this relates to the planning tools The [financial-independence calculator](https://www.marketcaplens.com/tools/fire-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](https://www.marketcaplens.com/learn/what-is-compound-growth) and [annualized investment growth](https://www.marketcaplens.com/learn/what-is-cagr). For general education only. Nothing here is investment advice. ## Frequently asked questions ### What is the difference between nominal and real return? Nominal return measures growth before adjusting for inflation. In this guide, real return measures inflation-adjusted growth in purchasing power before a separate tax adjustment. Some providers also subtract taxes, so check their definition. ### How do you calculate an inflation-adjusted return? Divide 1 plus the nominal return by 1 plus the inflation rate, then subtract 1. Use decimal rates for the same period. At an illustrative 8% nominal return and 3% inflation over one year, 1.08 divided by 1.03 minus 1 is about 4.85%. ### Can a positive return still lose purchasing power? Yes. If prices rise faster than your investment grows, its inflation-adjusted return is negative even if the dollar balance rises. Fees and taxes can reduce what you keep further. ## Sources - [NYU Stern, Aswath Damodaran: inflation and the nominal–real return relationship](https://pages.stern.nyu.edu/~adamodar/pdfiles/FoundationsOnline/slides/session10.pdf) - [Investor.gov: real-return definitions and tax adjustments](https://www.investor.gov/introduction-investing/investing-basics/glossary/real-return) References explain the concepts; MarketCapLens supplies the examples and calculator assumptions. See https://www.marketcaplens.com/about for who checks the numbers. ## Related guides - [Price vs. total return](https://www.marketcaplens.com/learn/price-return-vs-total-return) - [What is compound growth?](https://www.marketcaplens.com/learn/what-is-compound-growth) - [What is FIRE?](https://www.marketcaplens.com/learn/what-is-fire)