Inflation Adjusted Return Calculator
Find the real return after inflation eats into it.
All calculations happen locally in your browser — nothing is uploaded, stored or tracked.
Enter the nominal return
The rate your investment is earning.
Enter the inflation rate
Your assumption, e.g. 2–3%.
Choose the period
See the real growth over the years.
What Is a Real Return?
A nominal return is what your investment statement shows — the raw percentage gain. But if inflation is 3%, part of that gain just keeps pace with rising prices. The real return is what remains after inflation: the actual increase in purchasing power.
The calculator converts a nominal annual return into its real equivalent using the exact formula, and shows the difference over any number of years.
The Formula
This exact (Fisher) formula is more accurate than simply subtracting: with 8% nominal and 3% inflation, the real return is (1.08 ÷ 1.03) − 1 ≈ 4.85%, not 5%.
Your data never leaves your device.
Every calculation on this site runs in your browser using vanilla JavaScript. Nothing is uploaded, stored or tracked.
- 100% local, client-side calculations
- No data stored on any server
- No tracking, no analytics, no ads scripts
- Works offline once loaded
Frequently Asked Questions
What is the difference between nominal and real return?
Nominal is the headline percentage; real subtracts inflation's effect, showing the true gain in purchasing power.
How do I calculate the real rate of return?
Use (1 + nominal) ÷ (1 + inflation) − 1. The calculator applies this exact formula.
Why isn't it just nominal minus inflation?
That is an approximation. The exact formula is slightly lower — 4.85% vs 5% in the 8%/3% example — because inflation compounds on the gain too.
What inflation rate should I use?
A long-run historical average for your currency, commonly 2–3%, or a figure you forecast. The calculator uses your input.
Why do real returns matter for retirement?
Your spending power is what matters in retirement, so growth must be measured after inflation.