Inflation Calculator

Inflation Calculator – Calculate the Impact of Inflation | FinanceCalculatr

Entry — Inflation

Calculate how inflation affects the value and purchasing power of money over time. Use it as a US dollar or British pound inflation calculator to compare past and future amounts, project forward with a future inflation calculator, or look back with a historical inflation calculator — and see how the same amount changes under different inflation-rate assumptions.

Entry — Purchasing Power
$

Set an earlier ending year to use this as a reverse inflation calculator and see what a future amount was worth in the past.

%

Enter the assumed average annual rate. Historical U.S. long-run inflation has averaged roughly 3% — adjust as needed for your own assumption.

ℹ️ About the rate. This calculator uses the annual rate you enter — it does not pull live or historical government inflation data. For official U.S. year-by-year CPI figures, see the Bureau of Labor Statistics inflation calculator.
Inflation-adjusted value
$13,842
$10,000 in 2015 has the same purchasing power as about $13,842 in 2026.
  • Original amount$10,000
  • Number of years11 yrs
  • Assumed inflation rate3.0%
  • Total price increase+38.4%
  • Purchasing power of $10,000 today (in 2026 terms)$7,224
  • Purchasing power lost27.8%
How Inflation Changes Your Money Over Time
Bar chart comparing the nominal inflation-adjusted amount and the shrinking purchasing power of the original amount, year by year.
Inflation-adjusted value Purchasing power of original amount
YearInflation-Adjusted ValuePurchasing Power

Explore Different Inflation Rates

See how the assumption changes the outcome

Small differences in the assumed inflation rate compound significantly over long periods. Here’s what your amount and period look like at a few common rates.

The Math

Inflation Calculator Formula

The calculator compounds a constant annual rate across the number of years between your two dates.

Future Value = Present Value × (1 + Inflation Rate) Years
  • Present Value — the amount you start with, in the earlier year.
  • Inflation Rate — the assumed average annual rate, as a decimal.
  • Number of Years — the gap between your start year and end year.
  • Future Value — the amount with equivalent purchasing power in the later year.

Worked Example

Example: How Inflation Affects $10,000

Starting amount
$10,000
Annual inflation rate
3.0%
Number of years
10
Calculation
$10,000 × (1.03)^10
Final result
≈ $13,439

In practical terms: something that cost $10,000 ten years ago would cost about $13,439 today at a steady 3% annual inflation rate — and $10,000 held aside without earning anything would now buy only what about $7,441 bought a decade ago.

Understanding Inflation

What Does Inflation Do to Your Money?

  • 01

    Money loses purchasing power over time

    As the general price level rises, each unit of currency buys fewer goods and services than it used to.

  • 02

    Prices tend to rise gradually, most years

    Growing demand, rising costs, and expanding money supply are common drivers behind a persistent upward drift in prices.

  • 03

    Savings can quietly lose real value

    Cash sitting in a low-interest account can grow in balance while shrinking in what it can actually buy.

  • 04

    It matters for long-term planning

    Retirement savings, long-term contracts, and multi-year budgets all need to account for inflation to stay realistic — the same logic behind a cost-of-living adjustment (COLA) to wages or benefits.

  • 05

    The rate itself is uncertain

    Inflation varies by year and by country, so any projection is an assumption, not a guarantee.

  • 06

    The past isn’t a promise about the future

    Historical inflation trends inform expectations, but they don’t determine what will actually happen next.

Purchasing Power

Purchasing Power and Inflation

Purchasing power is simply what your money can actually buy. When prices rise faster than your money grows, purchasing power falls — even if the number in your account stays the same or increases.

For example, if a basket of groceries cost $100 last year and now costs $105, a $100 bill buys less of that same basket today. Your money hasn’t changed — what it can purchase has.

“Inflation doesn’t take money out of your account. It quietly changes how far that money goes.”

A Common Confusion

Inflation vs Interest

These two rates move independently, and mixing them up leads to a misleading picture of how your money is really doing.

  • 01

    Inflation rate

    How quickly average prices are rising across the economy.

  • 02

    Interest rate

    How quickly a balance grows in nominal dollars — before accounting for inflation.

  • 03

    Investment return

    The nominal gain on an investment, which may or may not outpace inflation.

  • 04

    Real return

    Interest or investment return minus inflation — what you actually gained in purchasing power.

Earning 3% interest while inflation runs at 3% means your real return is roughly zero — your balance grew, but your purchasing power didn’t. Only the gap between the two actually makes you better off.

Transparency

Inflation Calculator Assumptions

  • 01

    Future inflation is uncertain

    No calculator can predict actual future rates with certainty.

  • 02

    A constant rate is a simplification

    Real-world inflation fluctuates year to year rather than compounding at one fixed rate.

  • 03

    Prices vary by product and location

    Overall inflation figures blend many categories that individually move at different speeds.

  • 04

    History doesn’t guarantee the future

    Past inflation trends are a reference point, not a forecast.

  • 05

    Personal inflation may differ

    Your own spending mix may rise faster or slower than official, broad-based inflation measures.

Questions

Frequently Asked Questions

An inflation calculator estimates how the value of money changes over time due to inflation. It converts an amount from one year into its equivalent value in another year, using an annual inflation rate.
You enter a starting amount, a start year, an end year, and an annual inflation rate. The calculator compounds that rate across the number of years between the two dates to find the equivalent amount.
Multiply the original amount by (1 + inflation rate) raised to the number of years. The result is the amount with the same purchasing power in the later year.
As prices rise, each unit of currency buys less than it used to. Purchasing power falls even though the number of dollars you hold stays the same.
Future Value = Present Value × (1 + Inflation Rate) ^ Number of Years. This compounds a constant annual rate across the full period.
Yes. Enter a start year and an end year along with an annual rate, and the calculator finds the number of years automatically and applies the formula.
Yes, if savings earn less than the inflation rate, their real (inflation-adjusted) value falls even as the account balance grows.
Inflation measures how fast prices rise. Interest measures how fast money grows. Real return is what’s left of your interest after subtracting inflation.
No. Future inflation is uncertain and can vary from year to year. This calculator applies a constant assumed rate as a simplified estimate, not a forecast.
It is mathematically accurate for the rate and years you enter. Its real-world accuracy depends on how closely your assumed rate matches actual future or historical inflation.
Yes. Switch to Advanced mode and set the currency to British Pound (£) to view your amounts in GBP. The underlying math is the same regardless of currency — you’re simply supplying your own assumed UK inflation rate rather than a US one.
Yes. Enter your salary or wage as the amount, along with the start and end years, to see what an equivalent income would need to be to keep pace with inflation — useful for comparing a raise against the assumed inflation rate over the same period.
Not exactly. A CPI calculator applies actual, historical government price-index data for a specific country. This tool applies whatever constant annual rate you enter, which is useful for quick estimates and future projections, but it isn’t a substitute for official CPI figures when you need historical accuracy.

See what inflation does to your own numbers.

Free, fast, and no account required — run the calculator above with your own amount and years.

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