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📊 Real Rate of Return Calculator

Find out what your investments actually earn after inflation. Use the Fisher Equation to calculate your real return and see how purchasing power changes over 10 years.

Fisher Equation

Real Return = ((1 + Nominal) ÷ (1 + Inflation)) − 1

The simplified approximation Real ≈ Nominal − Inflation is less accurate. The Fisher Equation is the correct formula used by economists.

How to Use This Calculator

  1. 1
    Enter Nominal Return
    The stated or expected return on your investment before adjusting for inflation (e.g., 10% for S&P 500 long-term average).
  2. 2
    Enter Inflation Rate
    Current or expected inflation rate. US long-term average is ~3%; the Fed targets 2%.
  3. 3
    Enter Initial Investment
    Optional: enter an amount to see a 10-year purchasing power comparison table.
  4. 4
    Review Real Return
    The real return shows what you actually earn in purchasing power terms — what matters for retirement planning.

Real-World Example

Your investment earns 10% nominal. Inflation is 3%.

Simple approximation: 10% − 3% = 7% (slightly off)
Fisher Equation: (1.10 ÷ 1.03) − 1 = 6.80% real return
On $10,000 after 10 years: Nominal ≈ $25,937 | Real ≈ $19,305

Frequently Asked Questions

Nominal return tells you the number on paper. Real return tells you how much more you can actually buy. If your investment earns 3% and inflation is 3%, your real return is ~0% — you're not actually getting richer.

Developed by economist Irving Fisher, the equation states: (1 + nominal) = (1 + real) × (1 + inflation). Rearranged: real = ((1 + nominal) / (1 + inflation)) - 1. This is more accurate than the simple subtraction approximation.

The US Fed targets 2% inflation. Long-term historical average is ~3%. For conservative planning, use 3-3.5%. For recent periods, check the current CPI data.

Yes. If inflation exceeds your nominal return, your real return is negative — meaning your purchasing power is declining despite positive nominal returns. This is why savings accounts with 1% yield during 4% inflation lose real value.

All retirement projections should use real returns, not nominal, to avoid overestimating future purchasing power. A $1 million portfolio in 30 years may only be worth $400,000 in today's dollars after inflation.

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