Inflation-Adjusted Compound Interest Calculator
Project investment growth and see the result in today's purchasing power after inflation — the real value, not just the nominal number. Runs in your browser.
Inflation-adjusted result
- Nominal ending value
- $462,290
- Real value (today's dollars)
- $220,792
- Total contributed
- $160,000
- Purchasing power lost to inflation
- $241,498
Real value = nominal ÷ (1 + inflation)^years — what your future balance would buy in today's dollars. A 7% return with 3% inflation is only about 4% real growth. Equivalent shortcut: use a ~4% real return in a regular compound calculator. Informational, not financial advice.
About this tool
A big future balance is less impressive once you account for inflation eroding what those dollars can buy. This calculator projects investment growth the usual way — an initial amount plus monthly contributions compounding at your assumed return — and then discounts the result by your expected inflation rate to show the real value in today's purchasing power. The gap is often startling: a portfolio that grows to a large nominal figure over decades may be worth far less in real terms, because what costs a dollar today will cost more then. The key relationship it teaches is that real growth is roughly the return minus inflation — a 7% nominal return with 3% inflation is only about 4% of real growth — so for retirement-style planning, thinking in real (inflation-adjusted) dollars gives a truer picture than the headline nominal number. It also shows how much purchasing power inflation quietly removes. Returns and inflation are both assumptions and not guaranteed. It is informational, not financial advice. Everything runs in your browser.
How to use it
- Enter your initial amount, monthly contribution, return, and inflation rate.
- Set the number of years.
- Compare the nominal ending value to the real (today's-dollars) value.
- Plan retirement targets in real terms for a truer picture.
Frequently asked questions
- What is the difference between nominal and real value?
- Nominal is the raw future dollar amount; real is what that amount can actually buy, expressed in today's dollars after removing inflation. Real value = nominal ÷ (1 + inflation)^years. The real figure is the meaningful one for planning.
- How does inflation shrink my returns?
- Roughly, real growth ≈ nominal return − inflation. A 7% return with 3% inflation nets about 4% of real purchasing-power growth. Over decades that gap compounds into a large difference between the nominal and real ending values.
- What inflation rate should I use?
- Long-run US inflation has averaged around 2–3%, with periods higher and lower. Using ~3% is a reasonable default; raise it to be conservative. The tool lets you test different assumptions.
- Is there a shortcut to inflation-adjusting?
- Yes — instead of projecting nominal then deflating, you can run a regular compound calculator with a real return (your return minus inflation). Both approaches give the same today's-dollars answer; this tool does the deflation explicitly so you see both numbers.
- Does this include taxes?
- No. It adjusts for inflation only. Taxes depend on your account type and situation and would further reduce real spending power from a taxable account; tax-advantaged accounts (Roth, traditional) change the picture.
- Is this financial advice?
- No. It is an informational projection based on your assumptions. Consult a financial advisor for planning.