See what your investment earns after inflation. Enter a nominal return and an inflation rate to get the exact inflation-adjusted return via the Fisher equation — plus what a lump sum becomes in both nominal dollars and today's buying power.
Answer first: your real rate of return is what's left of your investment return once inflation has taken its bite — the growth in actual purchasing power, not just in dollars. This real rate of return calculator applies the exact Fisher equation rather than the rough "return minus inflation" shortcut, and then projects a lump sum forward in both nominal dollars and today's buying power.
Real return = (1 + nominal) ÷ (1 + inflation) − 1
Example: 8% nominal during 3% inflation → 1.08 ÷ 1.03 − 1 = 4.854% real. The shortcut (8 − 3 = 5%) overstates it slightly, and the error grows as inflation climbs.
Why does this matter? Because inflation is a silent, compounding fee charged against everything you own. At 3% inflation, prices roughly double every 24 years — so $10,000 growing at 8% for 20 years becomes $46,610 on your statement, but only buys what about $25,808 buys today. Both numbers are true; only the second one tells you how much richer you actually got. Judging investments on nominal returns alone is how savers end up feeling poorer despite "making money" every year.
The nominal return is the raw percentage on your brokerage statement. The real return restates it in constant purchasing power. Historically, U.S. large-cap stocks have delivered roughly 9–10% nominal but closer to 6–7% real over the long run; cash and short-term savings often hover near 0% real or below. That's the core argument for owning productive assets over long horizons: they are the ones with a track record of outrunning inflation, though never in a straight line. Read how inflation affects stocks for the mechanics.
At low inflation the shortcut is close enough: 8% − 2% = 6% vs the exact 5.88%. But push inflation to 10% and a 15% nominal return is really 1.15 ÷ 1.10 − 1 = 4.55%, not 5% — and over decades those fractions of a percent compound into serious money. The exact method also handles negative territory correctly: a 2% savings rate during 5% inflation is 1.02 ÷ 1.05 − 1 = −2.86% real. Your balance rises while your buying power quietly falls, which is precisely the situation the quick mental math tends to hide.
Add an investment amount and a number of years and the calculator compounds both ways: the nominal future value uses your nominal rate, while the "in today's dollars" figure compounds at the real rate — equivalent to deflating the nominal result by cumulative inflation. It's the single most useful reframe in retirement planning: a "$1 million nest egg" 30 years from now, at 3% inflation, buys what about $412,000 buys today. Plan around the real number, not the headline.
Reality check: future inflation and returns are assumptions, not promises — small changes in either compound into very different outcomes, and this tool ignores taxes and fees. It is an educational calculator, not financial advice. For historical U.S. inflation data see the Bureau of Labor Statistics at bls.gov/cpi, and for investing basics the SEC's investor.gov.
Pair this with the inflation calculator to see buying-power erosion on its own, the compound interest calculator to project savings, and the annualized return (CAGR) calculator to find the nominal rate to feed in. Planning withdrawals? The 4% rule calculator already thinks in inflation-adjusted terms.
Last updated July 2, 2026 · Written by Mustafa Bilgic. Educational only — not financial advice.
The real rate of return is your investment return after subtracting the effect of inflation — the growth in what your money can actually buy. The exact formula (Fisher equation) is (1 + nominal) ÷ (1 + inflation) − 1. An 8% return during 3% inflation is a real return of about 4.85%, not 5%.
Subtracting (8% − 3% = 5%) is a decent quick estimate, but it ignores compounding: inflation also erodes the gains themselves. The exact answer divides growth factors, giving 1.08 ÷ 1.03 − 1 = 4.854%. The gap between the shortcut and the exact figure widens as inflation rises.
Yes, and it is common for cash. A savings account paying 2% during 5% inflation has a real return of about −2.86% — the balance grows, but what it can buy shrinks. That is why long-term investors compare everything against inflation.
For history, use the actual CPI change over your holding period (the U.S. Bureau of Labor Statistics publishes it). For projections, many planners test a range such as 2–4%, since future inflation is unknowable. This calculator lets you try any assumption instantly.