Inflation Calculator: What a Price Will Cost in the Future
Work out what something will cost in the future once inflation has done its work — and how much purchasing power today's money quietly loses.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Future cost | Price increase |
|---|---|---|
| $1,000 · 3.1% · 25yr | $2,145.19 | $1,145.19 |
| $50,000 · 2.5% · 10yr | $64,004.23 | $14,004.23 |
| $100 · 4% · 30yr | $324.34 | $224.34 |
| $25,000 · 3% · 40yr | $81,550.94 | $56,550.94 |
How This Calculator Works
Enter an amount in today's money, an annual inflation rate, and a number of years. The calculator compounds the amount forward at that rate to show the future cost, and the price increase that inflation adds over the period.
The Formula
Future Value of a Lump Sum
PV = present value, r = annual rate, n = number of years
Worked Example
At a 3.1% inflation rate, something costing $1,000 today would cost about $2,145 in 25 years. The same goods more than double in price — and a dollar held as cash loses more than half its purchasing power.
Key Insight
Inflation is compound erosion. A rate that looks small over one year — around 3% — quietly halves the value of idle cash over roughly two decades, which is why money meant for the long term is usually invested rather than held.
Headline vs core CPI: what each one tells you
The US Bureau of Labor Statistics publishes two main inflation measures monthly. Headline CPI (CPI-U): all goods and services in the consumer basket, including food and energy. Core CPI: excludes food and energy because they're volatile (oil prices swing 20% in a quarter; grocery prices fluctuate with weather, supply shocks).
Both matter for different decisions. Headline CPI determines what you actually pay at the store, Social Security COLA adjustments, TIPS bond payments, contractual escalators. Core CPI is what the Federal Reserve watches for monetary policy because it strips noise and shows underlying trend.
Recent example: 2022-2023 saw headline CPI hit 9.1% (June 2022) while core stayed around 6.5% — the gap was almost entirely energy and food spikes from the Ukraine war and supply chain disruption. By 2024, energy normalized and headline fell to ~3% while core remained sticky around 4%. Knowing which measure is quoted prevents confusion when news reports diverge.
Your personal inflation rate vs national average
National CPI averages a representative basket — it may not reflect your spending. Retirees often experience higher 'personal inflation' than national average because healthcare (high inflation, 4-6%/year) dominates their spending and tech (deflationary, -2-5%/year) is irrelevant.
Renters in expensive cities (NYC, SF, Boston) often see personal inflation 2-3 points above national because shelter is 30-50% of their spending vs ~33% in CPI basket. Homeowners with fixed mortgages see lower effective inflation because shelter cost is locked in by the loan.
Calculate your own rough personal inflation: list your top 5 spending categories with % of budget, multiply each by category-specific inflation (BLS publishes these by category), sum. The result often differs from headline CPI by 1-2 percentage points in either direction. This matters for retirement planning — using national CPI for a retiree expecting heavy medical spending could underestimate true cost-of-living inflation by 30%.
Real vs nominal: thinking in today's dollars
Nominal value: face dollar amount. Real value: nominal adjusted for inflation back to a reference year's dollars. The distinction is critical for long-horizon planning where inflation compounds.
Concrete example: $1M in 2026 vs $1M in 2056. Both are 'a million dollars' but they buy very different things. At 3% average inflation, $1M in 2056 has the purchasing power of $412,000 in today's 2026 dollars. The 'real' future value of $1M nominal is less than half its face number.
For retirement planning: when someone says 'I want $80,000/year in retirement', clarify: in today's dollars? Or face dollars at retirement? Big difference. A 35-year-old planning to retire in 30 years targeting '$80k/year (today's purchasing power)' actually needs to plan for ~$194k/year nominal (3% inflation × 30 years). Confusing these inflates or deflates the savings target by 2-3×. Always specify which dollars you're talking about.
Cumulative inflation impact over time
What $100,000 of today's purchasing power requires in nominal dollars at various future dates and inflation rates. Use as a sanity check on long-horizon financial plans.
| Years from now | 2% inflation | 3% inflation | 4% inflation | 5% inflation |
|---|---|---|---|---|
| 10 years | $121,899 | $134,392 | $148,024 | $162,889 |
| 20 years | $148,595 | $180,611 | $219,112 | $265,330 |
| 30 years | $181,136 | $242,726 | $324,340 | $432,194 |
| 40 years | $220,804 | $326,204 | $480,102 | $704,000 |
US long-run average inflation (1913-2024): ~3.2%. Fed target: 2% (PCE). Recent ranges 2020-2026: 1.5-9.1% headline. For retirement planning use 2.5-3.5% as a base case; consider 4-5% as stress-test for high-inflation scenarios.
Frequently Asked Questions
How does inflation raise future costs?
Inflation compounds: each year's prices rise on top of the previous year's higher prices. Over decades, even a modest rate produces a large cumulative increase.
What inflation rate should I use?
The cited benchmark shows recent inflation. For a long projection, many people use a long-run average of around 2% to 3% rather than the latest single figure.
What does this mean for cash savings?
Cash that earns less than inflation loses purchasing power every year. The future cost shown here is also how much more you would need just to stand still.
Is this how official inflation is measured?
Official inflation tracks a basket of goods through a price index. This calculator applies one steady rate, which is a simplified projection of that idea.
How do I protect against inflation?
Holding assets that tend to grow at or above inflation — such as diversified investments — preserves purchasing power better than cash over long periods.
References & Authoritative Sources
- BLS — Bureau of Labor Statistics — Consumer Price Index — official monthly release · consulted May 31, 2026 · Federal statistics agency — authoritative US CPI data, headline and core, by category
- BEA — Bureau of Economic Analysis — PCE (Personal Consumption Expenditures) Price Index · consulted May 31, 2026 · Fed's preferred inflation measure — slightly different methodology from CPI
- Federal Reserve — Monetary Policy Reports — Fed inflation target (2% PCE) · consulted May 31, 2026 · Federal Reserve — policy framework, current Fed Funds Rate, inflation outlook
Related Calculators
Data Sources & Benchmarks
This calculator draws on 2 independent, dated sources. The starting values for inflation rate are taken from the benchmarks below and refresh whenever the snapshots are updated.
Methodology & Review
The future cost compounds today's amount annually at a fixed inflation rate. The model assumes a constant rate; real inflation varies year to year, so treat the result as a steady-rate projection.
Updated