See what money will be worth in the future, or what a past amount is worth today, at a chosen average annual inflation rate.
| Year | Cumulative Inflation % | Equivalent Value |
|---|
Enter Amount & Rate
Fill in an amount, number of years, and inflation rate to see the projected value.
The inflation calculator is a purchasing power calculator that shows how a chosen average annual inflation rate erodes — or, viewed in reverse, historically built up — the value of money over time. In Future Value mode, it answers "what nominal amount will I need in the future to buy what this amount buys today?" In Past Value mode, it answers "what is a past amount worth in today's money?" It works with any currency, since the underlying math of compounding inflation is identical regardless of the unit.
You enter an amount, a number of years, and an average annual inflation rate — either your own assumption or one of the illustrative historical-average presets (US, India, UK). In Future Value mode, the calculator compounds the amount forward using Future Nominal Cost = Amount × (1 + r)^years, showing what you'd need to spend in the future to buy what your amount buys today, alongside the eroded real value of holding that same amount unchanged. In Past Value mode, it compounds the amount forward from the past to today using the same formula, showing the present-day equivalent of a historical sum.
This tool is useful for retirement planners setting savings goals in future dollars rather than today's, anyone curious why prices from a decade or two ago look implausibly cheap, savers and investors comparing a nominal return against inflation to find their real return, and students learning how compounding applies to prices, not just interest. It works alongside NeftCal's Compound Interest Calculator and Investment Calculator for a fuller "real return" picture.
Inflation compounds quietly, and a rate that looks small year to year — 3%, 4%, 5% — can erode a large share of purchasing power over one or two decades. Understanding this helps with retirement planning, setting long-term savings goals in tomorrow's dollars rather than today's, and simply making sense of why prices from your childhood look implausibly cheap today. Comparing an investment's nominal return against a chosen inflation rate is also the basis of "real return" thinking used across savings and investment planning.
Both modes use the same compounding formula, applied forward or backward in time
Inflation compounds year over year just like interest — a 3.5% rate doesn't erode 3.5% total value over 10 years, it compounds to roughly 41% cumulative price increase.
Future Value mode projects forward from today; Past Value mode projects forward from the past to today. Both use the identical compounding formula — only the starting point and direction of interpretation change.
This calculator projects a constant rate you choose. Real-world inflation fluctuates year to year and is influenced by countless economic factors — treat results as an illustration of compounding, not a guaranteed prediction.
From mode selection to a year-by-year purchasing-power projection
Pick Future Value to see what an amount today will look like in future dollars, or Past Value to see what a historical amount is worth today.
Enter the sum of money you want to project — the calculator works in any currency, since the underlying compounding math is the same for any unit of money.
Enter how many years into the future (Future Value mode) or how many years ago (Past Value mode) the amount refers to.
Enter your own assumed rate, or use one of the illustrative historical-average presets for the US (~3.2%), India (~5.5%), or UK (~3.8%).
See the projected nominal cost or past-to-present equivalent, cumulative inflation percentage, purchasing-power change, plus a year-by-year chart and table.
Using the calculator's own default scenario — $10,000 over 10 years at 3.5% inflation
Suppose you have $10,000 today and want to know what it will take to buy the same goods and services in 10 years, assuming a 3.5% average annual inflation rate (a typical developed-economy long-run average).
Explanation: Notice that a "modest-sounding" 3.5% annual rate compounds to a 41.1% cumulative price increase over just 10 years — nearly double the simple estimate of 35% (3.5% × 10) you might get from multiplying instead of compounding. This is exactly why retirement and long-term savings goals should be set in future, inflated dollars rather than today's dollars — a $10,000/month retirement income goal today would need to be roughly $14,106/month in 10 years just to maintain the same purchasing power.
What your cumulative inflation percentage actually signals
The size of your cumulative inflation percentage over the chosen period is a useful signal for how seriously to weight inflation in your planning.
| Average Annual Rate | Cumulative Impact (10 yrs) | General Read |
|---|---|---|
| Under 2% | ≈ 22% or less | Low, historically typical of well-anchored developed economies |
| 2% – 5% | ≈ 22% – 63% | Moderate, the common long-run range for many economies |
| Over 5% | ≈ 63%+ and climbing fast | High — purchasing power erodes significantly faster |
For long-term savers: even a "moderate" 2-5% rate compounds into a large cumulative effect over 20-30 years — always express a long-term goal in future, inflated dollars rather than today's dollars.
For real-return thinking: compare any nominal investment or savings return against your chosen inflation rate — a 4% savings return during 5% inflation is actually a small loss in real purchasing power, even though the account balance grows.
Rate uncertainty matters: the further out you project, the more a small difference in the assumed rate changes the outcome — run this calculator with a couple of different rates to see a realistic range rather than anchoring on one number.
This tool provides an illustrative projection at a constant assumed rate for educational and planning purposes only and does not constitute personalized financial, tax, or investment advice, nor a forecast of actual future inflation. Consult a licensed financial advisor for decisions based on inflation assumptions.
Where this purchasing-power projection earns its keep
Set a retirement income target in future, inflated dollars rather than underestimating it in today's dollars.
Compare a savings account or investment's nominal return against inflation to find your true real return.
Project what today's tuition costs might look like by the time a child reaches college age.
Understand how much a fixed budget will actually buy 10-20 years from now.
Find what a historical salary, price, or purchase is worth in today's money.
Understand how much a fixed salary offer erodes in real terms over a multi-year contract.
Combine with NeftCal's Investment Calculator to set growth targets that beat inflation, not just grow nominally.
Illustrate to students how compounding applies to prices, not just interest-bearing accounts.
Compare purchasing-power erosion across different national inflation-rate presets.
Pair with NeftCal's Currency Converter when planning finances that span two countries and currencies.
What this inflation calculator does well, and where it can't replace official CPI data
Two directions, one identical compounding formula
| Feature | Future Value Mode | Past Value Mode |
|---|---|---|
| Question answered | What will this amount need to grow to, to buy the same things later? | What is a past amount worth in today's money? |
| Direction | Today → future | Past → today |
| Key output | Future Nominal Cost & Real Value | Equivalent Value Today |
| Typical use | Retirement & long-term goal-setting | Historical price/salary context |
Common questions about inflation and purchasing power
Official guidance to complement this calculator — not a substitute for licensed financial advice
Other financial planning tools