Inflation-Adjusted Savings Goal Calculator

Find the future cost of a goal after inflation and the monthly contribution needed to reach it at a given rate of return.

Result

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How to use this calculator

Enter the goal amount in today’s dollars and the number of years.
Enter expected inflation and your expected annual return.
Add any current savings already earmarked for the goal.
Read the future cost and the monthly contribution needed.

About this calculator

A savings goal you set in today’s dollars will cost more by the time you reach it, because inflation steadily raises prices. This calculator does two things: it inflates your goal to its future cost over your time horizon, and it computes the monthly contribution required to accumulate that amount at your expected rate of return. It also credits any current savings, growing it forward and reducing the monthly amount you still need to set aside. Funding the inflated target — not today’s sticker price — is what keeps a long-term goal on track; ignoring inflation systematically under-saves. The contribution is derived from the future-value-of-an-annuity formula, so it accounts for the compounding growth of each monthly deposit. All figures are pre-tax and assume steady inflation and returns, so revisit the plan as conditions change.

How it works — the formula

Future cost = Target × (1 + inflation)^years
Needed = Future cost − Current × (1 + r/12)^n
Monthly = Needed × (r/12) ÷ ((1 + r/12)^n − 1)

Inflation grows the goal; the annuity formula spreads the remaining need into compounding monthly deposits.

Source: SEC Investor.gov — Savings Goal Calculator

Worked examples

Example 1

$50k goal, 10 yr, 3% inflation, 6% return

Inputs:: target=50000, years=10, inflation=3, returnRate=6, current=0
Output:: future $67,195.82, ~$410/mo

Example 2

Same with $10k current savings

Inputs:: target=50000, years=10, inflation=3, returnRate=6, current=10000
Output:: lower monthly (current grows)

Example 3

$20k goal, 5 yr, 2% inflation, 4% return

Inputs:: target=20000, years=5, inflation=2, returnRate=4, current=0
Output:: future ~$22,082, ~$333/mo

Limitations

Constant inflation/return with monthly compounding assumed.
Pre-tax; account type affects net returns.
Does not model variable or lump-sum contributions.

Planning projection, not a guarantee of investment results.

Frequently asked

Why adjust a savings goal for inflation?+

Because the thing you are saving for will cost more later. A $50,000 goal at 3% inflation becomes about $67,000 in ten years. Saving only for today’s price leaves you short, so the calculator targets the future, inflated cost.

How is the monthly contribution calculated?+

Using the future-value-of-an-annuity formula: it finds the monthly deposit that, growing at your return rate, accumulates to the inflated goal by the deadline, after subtracting the future value of any current savings.

What return rate should I use?+

Use a realistic expected return for your investment mix — historically diversified stock/bond portfolios have returned mid-single digits above inflation, but be conservative. A lower assumed return means a higher required monthly contribution.

Does current savings reduce my monthly amount?+

Yes. The calculator grows your existing savings forward at the return rate and subtracts it from the goal, so you only fund the remaining gap with monthly contributions.

Are taxes included?+

No, the figures are pre-tax. Investment gains may be taxed depending on the account type. Saving in tax-advantaged accounts (IRA, 401(k)) preserves more of the return; adjust your assumed rate down for taxable accounts.

What if inflation or returns differ from my estimate?+

The plan shifts. Higher inflation raises the future cost; lower returns require larger contributions. Treat the result as a starting plan and recalculate periodically as real inflation and portfolio performance unfold.