Real Return Calculator
Calculate your actual rate of return adjusted for inflation. Compare nominal future gains against real purchasing power using the exact Fisher Equation.
Enter parameters on the left to calculate inflation adjusted returns.
Understanding Real Return & Inflation Impact
The Real Rate of Return measures the growth of an investment adjusted for inflation. It represents the true growth in the purchasing power of your capital, showing what your future portfolio values are worth in terms of today’s goods and services.
The Approximate vs. Exact Fisher Equation
Many investors use a simple linear approximation to estimate inflation-adjusted returns:
While useful for small values, this approximation fails during periods of higher interest rates or high inflation. The **exact** compounding relationship is defined by the **Fisher Equation**:
Rearranging the formula to isolate the Real Rate gives:
Worked Example
Scenario: $10,000 Portfolio over 10 Years
- Nominal Return: 12% annual rate
- Inflation Rate: 5% annual rate
* **Approximate Real Return:** 12% – 5% = 7.00%.
* **Exact Real Return (Fisher):** ( 1.12 / 1.05 ) – 1 = 6.67%.
* **Nominal Future Value:** $10,000 × (1.12)10 = $31,058.48.
* **Real Future Value (Buying Power):** $10,000 × (1.0667)10 = $19,071.80.
* **Purchasing Power Loss:** $11,986.68.