Inflation-Adjusted Return Calculator
A 10% nominal return in a 4% inflation year is only a 5.8% real return. Calculate your true investment return after inflation using the Fisher equation and see what your money is actually worth.
What Is an Inflation-Adjusted (Real) Return?
The inflation-adjusted return, also called the real return, measures the actual growth of your purchasing power after accounting for rising prices. If your portfolio grew 8% in a year but consumer prices also rose 4%, your real return is only about 3.85% — you can buy only 3.85% more stuff than before, even though your account balance looks like it grew 8%. The nominal return is the number your brokerage shows; the real return is what actually matters for funding retirement, college, or any future expense.
This calculator uses the Fisher equation — the formal finance formula for converting nominal rates to real rates — and gives you both the annualized real rate and the final inflation-adjusted value in today's dollars.
How the Fisher Equation Works
The simple formula Real = Nominal minus Inflation is only an approximation that breaks down at higher rates. The precise Fisher equation is: (1 + real) = (1 + nominal) / (1 + inflation). Rearranged: real = (1 + nominal) / (1 + inflation) minus 1. At low rates (both under 3%) the approximation is fine, but at higher rates the difference matters — a 10% nominal return with 5% inflation is not 5%, it is 4.76% real. Over 30 years of compounding, that gap is massive.
We also convert the final nominal value to today's dollars by deflating it back using the compound inflation factor: future value divided by (1 + inflation) raised to the number of years. This shows what the ending balance can actually buy in current purchasing power — the only number that matters for real-world planning.
Why Real Returns Matter for Planning
Retirement calculators that use nominal returns without deducting inflation dramatically overstate how much your money will buy. A 40-year-old who sees "$1 million at age 65" from a 7% nominal projection actually ends up with only about $525,000 in today's purchasing power if inflation averages 2.5%. That is the difference between comfortable retirement and running out of money. Always plan in real terms — real returns, real withdrawal amounts, real goals.
Historical benchmarks (1926 to 2025, US data): S&P 500 real return ~6.9%, 10-year Treasury real return ~2.0%, gold real return ~0.7%, savings accounts real return roughly zero. Use these as sanity checks against your own assumptions. Last updated April 2026.