What Is This Calculator?

The QFINHUB investment return calculator shows what an asset actually earns over a holding period, after inflation and fees. I built it because I kept watching people confuse nominal return with real return, then wonder why their 7% portfolio felt like 3%. Three numbers in, three numbers out. That's the whole thing.

Key Takeaways

The Formula

The Fisher equation strips inflation out of your stated return. A 7% nominal return with 3% inflation is actually 3.88% in real purchasing power.

Why This Matters — Real-World Application

I use a version of this whenever a friend brags about their crypto gains. The S&P 500 returned about 24% in 2024, but BLS CPI came in around 2.9%, so the real number was closer to 20.5%. Still strong, but a far cry from the headline figure. For long-term planning, FRED data shows the 30-year annualized real return on the S&P 500 sits near 6.8%, not the 10% people quote, and that gap of roughly 3.2 percentage points compounds into something enormous across a working career of forty years.

Practical Example

Key Factors That Affect Your Results

• Starting investment amount
• Ending value or annualized return
• Time period held
• Inflation rate over the period
• Fees and taxes paid

Tips for Using This Calculator

• 1Always quote real returns, not nominal. Your 8% fund with 3% inflation is a 4.85% real return.
• 2Look up the actual CPI-U number from BLS for the specific years you're measuring, not a generic estimate.
• 3Use FRED's 30-year Treasury constant maturity rate as a risk-free benchmark to compare your portfolio's excess return.

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Sources & References