Phase 2 · Wealth & Leverage
Inflation-Adjusted Return Calculator
The number on your statement lies by omission. Set your return, inflation and horizon to see your real return — and what your future balance is genuinely worth in today's dollars.
Under the hood
The math, fully exposed
We compound contributions at the nominal rate, then deflate the result to today's dollars:
Real rate = (1 + nominal) ÷ (1 + inflation) − 1 (Fisher equation)
Nominal balance = initial × (1+n)t + contribution × annuity factor at n
Real (today's $) = nominal balance ÷ (1 + inflation)t
Purchasing power kept = 1 ÷ (1 + inflation)t
- Inflation compounds against you: deflating by (1+inflation)t means a long horizon quietly shaves off most of a big nominal number.
- Subtraction understates the bite: dividing, not subtracting, is the correct Fisher adjustment — the gap widens as inflation rises.
- Real return is the only score that counts: a positive nominal return can still be a loss in purchasing power if inflation runs higher.
Your directives
What to do next, based on your numbers
Adjust the sliders to generate tailored recommendations.
Answers
Frequently asked questions
What is the difference between nominal and real return?
Your nominal return is the headline number — what your account statement shows. Your real return is what is left after inflation, i.e. the actual increase in your purchasing power. If your investments grow 7% in a year when prices rise 3%, you are only about 3.9% richer in things you can actually buy. Real return is the number that matters for retirement; nominal is the number that flatters.
Why isn't real return just nominal minus inflation?
Subtracting is a close approximation but slightly overstates your real return. The precise version divides: real = (1 + nominal) ÷ (1 + inflation) − 1. At 7% and 3% that is 3.88%, not 4.00%. The gap is small at low rates but grows when inflation is high, which is exactly when getting it right matters most. This calculator uses the precise Fisher equation.
How much does inflation erode a long-term balance?
Dramatically, because it compounds against you. At 3% inflation, prices roughly double every 24 years — so $1 today buys about 50 cents of goods in 2050. A portfolio that grows to an impressive nominal figure over 30 years may be worth far less in today's money. That is why this tool shows your ending balance both ways: the big nominal number and the sobering real one.
What can I do about it?
You cannot control inflation, but you can aim for assets whose returns historically outpace it — broad equities, real estate, and inflation-protected bonds (TIPS, I-bonds) — rather than holding excess cash that loses purchasing power every year. The goal is a positive real return after taxes and fees, not just a positive nominal one. This is an educational model, not investment advice.