Inflation-adjusted savings calculator
Set a goal in today's dollars, then test how inflation and a nominal return change the amount you may need. The output is a transparent scenario, not a prediction.
Divide a future nominal balance by (1 + inflation)years to express it in today's dollars. At a constant 3% inflation assumption, $1,000,000 today becomes about $2.43M in 30 years; the return assumption separately determines how a portfolio might grow. Enter both assumptions, compare scenarios, and keep the result separate from a guaranteed outcome.
* Contributions are modeled at month end. The real-return view treats the displayed amount as today's dollars and assumes it is increased with inflation; taxes, fees and changing returns are not modeled.
Why inflation changes a savings goal
Inflation changes the prices a future balance can pay for. With a constant annual assumption, the future nominal target is today's-dollar goal x (1 + inflation)years. The reciprocal factor converts a future balance back to today's purchasing power. Actual inflation is uneven, so use the formula to compare assumptions rather than to promise a future price level.
Common goals in real and nominal terms (2026)
These rows use a $0 starting balance, 3% constant inflation, an 8% nominal return, and equal month-end deposits. Monthly figures are the fixed nominal deposit needed to reach the inflated target; amounts are rounded for display.
| Goal in today's $ | Years | Nominal $ needed | Monthly at 8% nominal |
|---|---|---|---|
| $500K | 10 | $672K | $3,673 |
| $500K | 20 | $903K | $1,533 |
| $1M | 20 | $1.81M | $3,066 |
| $1M | 30 | $2.43M | $1,629 |
| $2M | 30 | $4.85M | $3,257 |
| $2M | 40 | $6.52M | $1,869 |
Nominal return versus real return
Nominal return is the rate before inflation. A simple constant-rate comparison uses real return = (1 + nominal return) / (1 + inflation) - 1. For example, 8% nominal and 3% inflation produce about 4.85% real return. This conversion does not remove market volatility, taxes, fees or sequence risk.
The calculator's real monthly amount is expressed in today's dollars. It assumes that contribution keeps pace with the selected inflation rate. If you plan to keep the deposit fixed in nominal dollars, use the nominal target view and model that contribution separately.
Use ranges and review the inputs
- Run at least a lower and higher return case; a smooth rate cannot show a market loss or an uneven path.
- Change the inflation assumption to see how sensitive the target is. No single historical average predicts your household's future costs.
- Account for fees, taxes, contribution limits, liquidity needs and the specific account or product disclosure.
- For historical U.S. price data, use the BLS Consumer Price Index. For investing risks and basic definitions, see Investor.gov.
Inflation-linked products are not interchangeable
Treasury Inflation-Protected Securities (TIPS) and U.S. Series I savings bonds have rules, maturities, purchase constraints and market or redemption conditions. A broad portfolio, cash account and inflation-linked security also have different risks and liquidity. Compare the current Treasury terms and account disclosures instead of treating any one asset as a universal hedge.
Related calculators
- Inflation calculator - compare historical or assumed purchasing power.
- Compound investment calculator - model nominal growth with deposits.
- FIRE calculator - connect a spending goal with an explicit return assumption.
- Cost of waiting to invest - compare the arithmetic effect of a delayed start.
Frequently asked questions
What is the difference between nominal and real returns?
A nominal return is the rate before inflation. A real return estimates the change in purchasing power: (1 + nominal return) / (1 + inflation) - 1. For example, 8% nominal and 3% inflation produce about 4.85% real return in a constant-rate scenario.
How does inflation affect a $1 million goal?
At a constant 3% annual inflation assumption, $1,000,000 of today's buying power corresponds to about $2.43 million in 30 years: 1,000,000 x 1.03^30. This is an arithmetic scenario, not a forecast.
What inflation rate should I use?
There is no rate that is correct for every future period. Use a clearly labeled assumption, compare a lower and higher case, and review official CPI data when you update a plan. The calculator does not predict future inflation.
How do you calculate the real purchasing power of savings?
Divide the future nominal amount by (1 + inflation)^years. A constant $100,000 balance at 3% inflation for 20 years has about $55,368 of today's purchasing power. If the balance earns a return, grow it first and then apply the same inflation factor.
Does the monthly result stay fixed in nominal dollars?
The displayed real monthly amount is in today's dollars. It assumes contributions keep their purchasing power, so the nominal dollar deposit rises with the inflation assumption. Deposits are modeled at month end; taxes, fees, volatility and changing rates are not modeled.
Is an inflation-adjusted projection a guarantee?
No. The result is a fixed-rate illustration. Investment values can fall, inflation can differ from the assumption, and fees and taxes can reduce results. Use several scenarios and current account disclosures before making a decision.