— Investment
Inflation-Adjusted Return Calculator
Turn a headline return into a real one — what is left after inflation — and see what an investment is really worth in today’s money.
Real (inflation-adjusted) return
4.85%
- Purchasing-power gap
- 3.15%
- Simple approximation (nominal − inflation)
- 5%
— Nominal vs real value
Download— How it works
Real return = (1 + nominal) ÷ (1 + inflation) − 1; real value = nominal value ÷ (1 + inflation)^t
Nominal vs real return
A nominal return is the headline number — what your balance grew by. A real, inflation-adjusted return strips out inflation to show what that growth was actually worth: how much more your money can buy. If your investment rose 8% in a year when prices rose 3%, your purchasing power grew by less than 8%.
Worked example — 8% nominal return, 3% inflation: Real return = (1.08 ÷ 1.03) − 1 = 0.0485, i.e. about 4.85%. So your spending power grew roughly 4.85%, not the headline 8%.
Why not just subtract?
The familiar shortcut — nominal minus inflation — gives 8% − 3% = 5%, close to the exact 4.85% but not identical. The gap comes from the fact that inflation also erodes the return itself, not just the principal, so the true real return is always a little below the simple difference.
At low rates the shortcut is fine for a rough answer; as both the return and inflation climb, the difference grows and the exact Fisher formula matters. The calculator shows both side by side so you can see how far apart they are.
The real value of your money over time
A percentage only tells half the story. Enter an investment amount and a period under Advanced options and the calculator projects two lines: the nominal value, growing at the headline rate, and the real value — that same balance expressed in today’s money. The widening gap between them is inflation’s drag made visible, and the year-by-year table lists both.
Over long horizons the effect is striking: a balance that looks impressive in future money can be worth far less in the purchasing power you actually care about. The “real maturity value” is the figure to plan around.
Worked example — $100,000 at 8% for 20 years, 3% inflation: Nominal value ≈ $466,000. In today’s money that is only about $258,000 — inflation has quietly removed roughly $208,000 of apparent value.
Tax as well as inflation
Inflation is not the only drag. In a taxable account, tax is taken from the nominal return before inflation gets to work on what is left. Enter a tax rate and the calculator shows the real after-tax return — tax off the nominal first, then inflation removed — which is the truest measure of what an investment earned you. For sheltered accounts, leave the tax rate at zero.
— Reader questions
What is the difference between nominal and real return?
Nominal return is the raw percentage your money grew; real return is that figure adjusted for inflation, reflecting the change in what your money can actually buy. Real return is the one that matters for long-term wealth.
Why is the real return lower than nominal minus inflation?
Because inflation erodes the return as well as the principal. The exact Fisher relation divides by (1 + inflation) rather than subtracting, which is always slightly less than the simple difference — about 0.15 points lower in the 8%/3% example.
How do I see the real value of my investment?
Enter an investment amount and a period under Advanced options. The calculator then shows the nominal maturity value, its value in today’s money, and how much purchasing power inflation removes — with a year-by-year table and a nominal-vs-real chart.
What does the real after-tax return show?
The return left after both tax and inflation. Tax is deducted from the nominal return first, then inflation is removed from what remains — the most honest measure of performance in a taxable account.
Can a real return be negative?
Yes. If inflation is higher than your nominal return, your purchasing power shrinks even though the balance grew in nominal terms — a negative real return. Cash in a low-rate account during high inflation is the classic case.
Is this the same as the Real Return calculation?
Yes — “real return” and “inflation-adjusted return” are the same thing, both given by the Fisher equation. This calculator adds the value-over-time view and an after-tax figure on top of the basic rate conversion.