Real Rate of Return Calculator
See what your return is really worth after inflation.
Result
How it is calculated
The tool uses the exact Fisher equation, not the shortcut of subtracting one rate from the other: real rate = ((1 + nominal ÷ 100) ÷ (1 + inflation ÷ 100) − 1) × 100. Nominal is the return you earned or expect before inflation, inflation is the price rise over the same period, and both are entered as percents for that one period, usually a year. The result is the change in purchasing power for the same period, and it is negative when inflation is higher than the return. Negative inflation (deflation) is accepted, but an inflation rate of −100% or lower is rejected, and so is a nominal return of −100% or lower, since that would mean losing everything or more; neither shows a result. The tool does not remove tax or fees, so enter an after-tax, after-fee nominal rate if you want those included.
Worked example
An investment returned 8% in a year when prices rose 3.5%. Step 1: 1 + 0.08 = 1.08 and 1 + 0.035 = 1.035. Step 2: divide: 1.08 ÷ 1.035 = 1.0435. Step 3: subtract 1 and multiply by 100: the real rate of return is 4.35%. The quick subtraction 8 − 3.5 = 4.5 overstates it slightly. In practice, 100 units of buying power grew to about 104.35 units after allowing for the price rise.
Common mistakes
- Using the simple difference of the two rates. It is close at low rates, but it is off by a growing margin as inflation rises: it overstates a positive real return and exaggerates a negative one.
- Mixing periods, such as a 5-year total return with a yearly inflation rate. Both rates must cover the same period.
- Entering rates as decimals (0.08) instead of percents (8). The result would be close to zero.
- Using pre-tax, pre-fee returns when the goal is real spending power. Taxes and fund fees reduce the nominal rate before inflation takes its share.
- Expecting a positive nominal return to be a positive real return. If inflation is 5% and the return 3%, the result is -1.90%, meaning purchasing power fell.
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.
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