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Inflation Calculator

Calculate how inflation affects the purchasing power of money over time.

Result

Equivalent Future Amount
$13,439.16
Today's Purchasing Power (in future)
$7,440.94
$20K$15K$10K$5K$0Purchasing Power - Yr 0: $10KPurchasing Power - Yr 1: $10KPurchasing Power - Yr 2: $9KPurchasing Power - Yr 3: $9KPurchasing Power - Yr 4: $9KPurchasing Power - Yr 5: $9KPurchasing Power - Yr 6: $8KPurchasing Power - Yr 7: $8KPurchasing Power - Yr 8: $8KPurchasing Power - Yr 9: $8KPurchasing Power - Yr 10: $7KYr 0Yr 2Yr 4Yr 6Yr 8Yr 10

About the Inflation Calculator

Inflation quietly erodes purchasing power every year, which means the same dollar amount buys less in the future - and money you're not spending today needs to at least keep pace with inflation just to maintain its value. Our Inflation Calculator shows both directions of that relationship.

How It Works

The calculator projects your amount forward at your entered inflation rate to show the equivalent future amount needed to buy the same goods and services, and separately shows how much today's purchasing power would be reduced to if left unadjusted over the same period.

Future equivalent = Amount × (1 + inflation rate)^years Reduced purchasing power = Amount ÷ (1 + inflation rate)^years

Formula & Methodology

Inflation compounds exactly like interest, just working against purchasing power instead of growing an account balance - prices rise by a percentage each year, and that percentage applies to an already-higher base the next year. The two directions of this calculator are mirror images: multiplying by (1+rate)^n projects how much more money you'd need in the future to buy today's basket of goods, while dividing by the same factor shows how much a fixed amount held today would be reduced to in today's purchasing-power terms after that many years of inflation.

Step-by-Step: Calculating It By Hand

  1. 1Raise (1 + inflation rate) to the power of the number of years.
  2. 2To find the future cost of today's amount: multiply the amount by that result.
  3. 3To find today's-dollar purchasing power of a fixed future amount: divide the amount by that same result.

Examples

Cost of living increase

$10,000 today at 3% inflation for 10 years means you'd need about $13,439 in 10 years to buy what $10,000 buys today.

Eroding purchasing power

That same $10,000 left unspent and un-invested for 10 years at 3% inflation would only have the real purchasing power of about $7,441 in today's terms.

Advantages

  • Shows inflation's effect in both directions - future cost and eroded purchasing power
  • Makes the case for why cash sitting idle loses real value over time
  • Useful for retirement and long-term financial planning that must account for rising costs
  • Works for any amount, rate, and time horizon

Common Mistakes

  • Ignoring inflation entirely when planning long-term savings or retirement goals
  • Using a historical average inflation rate without considering it could be higher or lower going forward
  • Comparing salary or investment growth to nominal dollar figures instead of inflation-adjusted ones
  • Forgetting that inflation compounds just like interest - its effect grows faster than a simple percentage suggests over long periods

Edge Cases to Watch For

  • Inflation rates vary meaningfully year to year and by category (healthcare and education have often outpaced general inflation, for example) - a single flat assumption is a simplification.
  • Cash sitting in a non-interest-bearing account loses purchasing power at the full inflation rate, while cash in an interest-bearing account loses purchasing power only at the gap between inflation and the interest rate earned.
  • Wage growth that matches or exceeds inflation offsets its effect on real income, even though prices are still technically rising.
  • Deflation (negative inflation) is mathematically valid in this same formula and would increase rather than decrease purchasing power over time.

Common Use Cases

  • Understanding how much prices will rise over a specific time period
  • Adjusting long-term financial goals for expected inflation
  • Explaining why cash savings alone lose value over time
  • Retirement planning that accounts for rising future costs
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

What's a typical inflation rate to assume?

The US Federal Reserve targets about 2% annual inflation long-term, though actual rates have varied significantly - 3% is a reasonable middle-ground planning assumption that accounts for periods running above target.

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Conclusion

Inflation is one of the most important - and most overlooked - variables in long-term financial planning. When projecting retirement or savings goals, always check that your projected growth rate outpaces inflation using our Compound Interest or Retirement calculators.

References