Inflation Adjusted Returns Calculator
Nominal returns include inflation; real returns subtract it. To know whether your investments are actually growing your purchasing power, calculate the real return.
About the inflation-adjusted returns calculator
An inflation-adjusted return (also called the real return) is the growth of your purchasing power after stripping out inflation. It is what matters for long-term planning: a 7 percent nominal return in a 3 percent inflation environment is only a 3.88 percent real return, and your retirement nest egg buys far less in 20 years than the headline number suggests.
This calculator applies the Fisher equation to convert nominal returns into real returns, and projects future portfolio values in both nominal dollars (what you will see on your brokerage statement) and real dollars (what those dollars will actually buy at the grocery store, the doctor, or a vacation rental). Treat the nominal projection as a vanity metric and the real projection as the planning number that determines whether you can retire on schedule.
How it works
Real return (exact) = (1 + Nominal) / (1 + Inflation) - 1 Real return (approximation) = Nominal - Inflation Future purchasing power = Future nominal / (1 + Inflation)^Years
- Nominal return = headline return reported by your broker or fund, before inflation adjustment.
- Inflation = annualised CPI-U for US planning, HICP for the eurozone, RPI/CPIH for the UK.
- Fisher equation = the exact conversion. The approximation only works well below 5 percent inflation.
Worked example
An investor puts $100,000 into a globally diversified index fund that returns 8 percent per year nominally. Inflation averages 3 percent. Over 20 years, what does the portfolio look like in real (today's) dollars?
- Approximate real return: 8% - 3% = 5%.
- Exact Fisher real return: (1.08 / 1.03) - 1 = 4.854%.
- Nominal value after 20 years: $100,000 x (1.08)^20 = $466,096.
- Inflation factor: (1.03)^20 = 1.806.
- Real value (today's dollars): $466,096 / 1.806 = $258,151.
- Compounded check: $100,000 x (1.04854)^20 = $258,151. Matches.
Historical real returns by asset class (1925-2024)
| Asset class | Nominal annualised | Inflation | Real annualised |
|---|---|---|---|
| US large-cap stocks (S&P 500) | 10.4% | 2.9% | 7.3% |
| US small-cap stocks | 11.7% | 2.9% | 8.6% |
| US long-term government bonds | 5.5% | 2.9% | 2.5% |
| US Treasury bills (cash) | 3.3% | 2.9% | 0.4% |
| Gold | 4.9% | 2.9% | 1.9% |
| US housing (Case-Shiller) | 4.2% | 2.9% | 1.3% |
Source: Ibbotson SBBI Yearbook 2025; Robert Shiller online data. Stocks dominate over multi-decade horizons; cash barely beats inflation; gold and housing are middling.
Common pitfalls
- Using nominal projections in retirement plans. A target of "$2 million by 65" in nominal dollars is worth only $1.1 million in today's purchasing power if 25 years away at 3 percent inflation. Always state retirement targets in real dollars.
- Subtracting instead of dividing. The subtraction approximation overstates real returns when inflation is above 5 percent. Always use the Fisher equation.
- Ignoring personal inflation. CPI is a national basket. If you spend disproportionately on healthcare or college tuition (both inflate 4 to 6 percent), use a personal rate higher than CPI.
- Holding too much cash. T-bills return only 0.4 percent above inflation historically. A large cash position is a guaranteed real loss in a 3 percent CPI world.
- Confusing geometric and arithmetic returns. Long-run reported returns are usually geometric (compounded). The arithmetic average always exceeds the geometric, and the gap widens with volatility.
- Forgetting taxes inflate real losses. Inflation is taxed implicitly because the IRS taxes nominal gains. If your fund grows 8 percent nominally, you owe capital gains on the whole 8 percent even though only 4.85 percent is real growth. Hold inflation-sensitive assets in tax-advantaged accounts where possible.
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Frequently asked questions
What inflation rate should I assume for long-term planning?
The US long-run average measured by CPI-U is roughly 3.1 percent per year since 1925 and 2.5 percent since 2000. The Federal Reserve targets 2 percent on PCE. For retirement planning, most advisors use 2.5 to 3 percent. The 2021 to 2022 spike to 9 percent was an outlier driven by post-pandemic supply chains; by 2026 CPI is back around 2.5 percent.
Are bonds inflation-protected?
Standard nominal bonds are not. TIPS (Treasury Inflation-Protected Securities) adjust their principal with CPI-U; I Bonds combine a fixed rate plus a CPI-linked rate; UK linkers and Canadian RRBs work similarly. Most retail bond portfolios should hold 20 to 40 percent in inflation-linked instruments, especially within a decade of retirement.
Are stocks a good inflation hedge?
Long term yes, short term no. Companies pass through input cost increases as higher prices, so nominal earnings rise with inflation, and equities have beaten inflation by roughly 6 to 7 percentage points annually since 1925. But in the 2 to 3 years after an inflation shock, stocks often lag because central banks raise rates to fight inflation, compressing P/E multiples.
What is the difference between CPI and PCE inflation?
CPI (Consumer Price Index) is the Bureau of Labor Statistics measure and the basis for Social Security COLA adjustments, TIPS, and most cost-of-living comparisons. PCE (Personal Consumption Expenditures) is the Bureau of Economic Analysis measure, weights spending categories differently, and is the Federal Reserve's preferred 2 percent target metric. PCE typically runs about 0.3 percentage points below CPI.
Why does the Fisher equation matter when simple subtraction is close?
At low inflation the subtraction approximation is within a few basis points of the exact Fisher result, so it works for back-of-envelope math. The error compounds across 30 to 40 year horizons, however. A 0.15 percentage point overstatement on a 30 year projection inflates the projected real ending balance by roughly 4.6 percent, enough to throw a retirement plan off by tens of thousands of dollars. Always use the exact (1+n)/(1+i) formula in spreadsheets and planning calculators.
Sources
- Bureau of Labor Statistics - CPI-U historical data, 1913-2026.
- Federal Reserve - PCE inflation series and target framework.
- Ibbotson SBBI Yearbook 2025 - asset class historical returns.
- Shiller, Robert J. - Online financial data, Yale.