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Inflation Adjusted Purchasing Power Calculator

What today's dollars buy after N years at a constant inflation rate, and the real value of a future sum.

Page updated 2026-09-14.

Inflation Adjusted Purchasing Power Calculator visual
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Calculator

Default $10,000.

Default 3%.

Default 10.

Calculated Results

Purchasing power left

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Future dollars to match today

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Real value lost

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What $10,000 today is worth in 10 years

At 3% annual inflation, $10,000 in today's dollars will only buy $7,440.94 worth of goods and services in 10 years -- a real loss of $2,559.06 in purchasing power, even though the number itself (if left in cash) never changes.

Looking at it the other direction: to have the same buying power as $10,000 today, you'd need $13,439.16 in 10 years. That's the number relevant if you're setting a future savings or income target and want it to feel like today's dollars.

The formula is compound decay: future purchasing power = present value / (1 + inflation rate)^years. Small inflation-rate differences compound significantly -- 3% vs. 4% inflation over 10 years is the difference between losing about 26% and about 32% of purchasing power.

Why this isn't a forecast

Constant CPI assumption. Not a forecast of any official index. Actual inflation varies year to year -- some years run near 1-2%, others (like 2021-2022) ran well above 6% -- and this calculator assumes one flat rate for the entire period, which real inflation never does.

This measures purchasing power of a static dollar amount, not what happens if that money is invested or earning interest -- for the version of this question where the money is earning a return while inflation erodes it, see the Inflation Impact Savings Calculator.

Amount, rate, and years combine directly in the formula -- there's no minimum or maximum enforced beyond requiring years to be a positive number for the exponent to make sense.

Where this matters most

This calculation is most relevant to fixed, non-indexed obligations -- pension payments, life insurance payouts, or a fixed annuity -- where the nominal dollar amount is guaranteed but its real value erodes every year it's not adjusted.

If you're comparing this erosion against a specific savings account's interest rate, the High-Yield Savings APY Comparator shows whether a given account's yield is outpacing or losing to your assumed inflation rate.

Frequently Asked Questions (FAQ)

How is the $7,440.94 purchasing-power figure calculated?

Real value = present amount / (1 + inflation rate)^years. Here: $10,000 / (1.03)^10 = $7,440.94. It's the compound-decay mirror of a compound-growth formula.

What's the difference between the two dollar figures shown?

Purchasing power left ($7,440.94) tells you what today's $10,000 will be able to buy in 10 years. Future dollars needed ($13,439.16) tells you how much money, in future dollars, would have the same buying power as $10,000 today. They answer the same question from opposite directions.

Is 3% the actual inflation rate I should plan around?

Constant CPI assumption. Not a forecast of any official index. 3% is a commonly cited long-run average, but actual annual inflation has ranged from near 0% to over 8% in recent history. Run the calculator at a few different rates to see a range rather than trusting one number.

Does this account for the money earning interest while it sits?

No. This calculator isolates pure purchasing-power erosion on a static amount. If the money is earning interest somewhere, use the Inflation Impact Savings Calculator instead, which nets an interest rate against the inflation rate.

Why does a small change in the inflation rate make a big difference over 10 years?

Because the erosion compounds exponentially, not linearly. The gap between 3% and 5% inflation might look small year to year, but over a full decade it compounds into a meaningfully larger loss of purchasing power.

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