Real Rate of Return Calculator

About this calculator

The real rate of return adjusts a nominal investment return for inflation, showing the actual increase in purchasing power an investor gained, rather than just the raw percentage gain in dollar terms. It’s calculated with the Fisher equation: Real Rate = [(1 + Nominal Rate) ÷ (1 + Inflation Rate)] − 1, though a simpler approximation (Nominal Rate − Inflation Rate) is commonly used when both figures are relatively low.

A 6% nominal return sounds solid, but if inflation ran at 4% over the same period, the real rate of return is only about 1.9% — the true growth in what that money can actually buy. Investors and retirees rely on real return rather than nominal return when planning long-term goals like retirement, since it’s purchasing power, not the nominal account balance, that determines whether savings will cover future expenses.