Inflation Calculator
Estimate how inflation changes the future cost of an amount over time.
How to use this inflation calculator
- Enter a starting amount
Type the amount you want to adjust for inflation.
- Set the annual inflation rate
Enter a yearly inflation assumption that fits your planning scenario.
- Choose the number of years
Enter how many years of inflation to project.
- Review the results
Check the future value, inflation increase, cumulative inflation rate, and purchasing power loss.
- Apply to planning
Use the result to adjust savings goals, salary benchmarks, or retirement income targets for expected price growth.
How this inflation calculator works
This inflation calculator projects how a given amount of money changes in purchasing power over time using a constant annual inflation rate. It applies the standard compound-growth formula to estimate the future nominal cost of today's goods and services, and also shows how much purchasing power a fixed cash amount loses over the same period. This is essential for long-term financial planning, salary negotiations, retirement projections, and understanding the real cost of deferred spending.
Future amount = present amount × (1 + inflation rate)^years At a 3 % annual inflation rate over 20 years, something that costs $100 today would cost approximately $180.61. That means prices rose by about $80.61, while $100 held in cash (earning no interest) would lose about $44.63 of today's purchasing power.
At 3 % annual inflation over 20 years, something costing $100 today would cost approximately $180.61. If a salary stays fixed at $100 during the same period, the earner effectively loses $44.63 in purchasing power — highlighting why raises that merely match inflation only preserve your standard of living rather than improve it.
Doubling the time horizon to 40 years at the same 3 % rate does not simply double the price increase — it compounds it. The same $100 item would cost approximately $326.20, demonstrating how inflation accelerates over long periods and why retirement projections need to account for decades of compounding price growth.
- ✓ The model uses a constant annual inflation rate — actual inflation varies year to year and can spike or dip unpredictably.
- ✓ The calculation assumes general inflation (CPI-based); specific categories like healthcare, education, or housing may inflate at very different rates.
- ✓ Purchasing power loss is the mirror image of price inflation: if prices double, each unit of money buys half as much.
- ✓ Deflation (negative inflation) is theoretically possible but rare in modern economies.
- Long-run inflation assumptions vary by country and time period, so use a rate that matches the market and planning horizon you are modeling.
- When projecting retirement needs, use inflation to convert future expenses back into today's purchasing power — for example, $1,000,000 in the future may only have about $553,675.75 of today's buying power over the same horizon and rate assumption.
- Wage growth that matches inflation keeps purchasing power stable; only real wage growth (above inflation) improves your standard of living.
- For category-specific inflation (e.g. medical, tuition), use the appropriate index rather than general CPI.
- Consumer price index methodology and historical inflation references
- Central bank and statistical-agency inflation datasets
What is inflation?
Inflation is the sustained increase in the general price level of goods and services over time, which erodes the purchasing power of money. When inflation runs at a positive rate, each unit of currency buys slightly less than it did the year before. Central banks typically target a low, stable inflation rate — often around two percent annually — as a sign of a healthy economy. The most common measure is the consumer price index, which tracks a representative basket of everyday goods and services. However, different spending categories inflate at different rates: healthcare, education, and housing have historically outpaced the general index in many markets, while technology costs have often declined. This variation means that your personal inflation rate depends on your spending mix. For financial planning, using the general rate as a baseline is reasonable, but if a major spending category dominates your budget — such as rent or medical care — a category-specific assumption may produce a more realistic projection.
Inflation and long-term financial planning
Inflation has a compounding effect that is easy to underestimate over long horizons. A seemingly modest annual rate can dramatically change the purchasing power of a fixed sum over 20 or 30 years. This matters for retirement savings, fixed-income pensions, insurance payouts, and any financial goal denominated in future dollars. When projecting how much money you will need in the future, the critical step is converting nominal targets into today's purchasing power — or equivalently, inflating today's spending to see what it will cost in future terms. Failing to account for inflation is one of the most common planning errors because the headline number on a savings projection can look impressive while the real spending power it represents may fall well short. Investments that outpace inflation grow real wealth, while cash holdings that earn below the inflation rate quietly lose value. Incorporating an inflation assumption into every long-term financial model is essential for setting realistic goals.
Inflation calculator FAQs
What inflation rate should I use?
For general planning, use a long-run rate that fits the market and period you are modeling. For conservative planning, a slightly higher assumption can provide a buffer. For specific categories like healthcare, housing, or education, category-specific historical rates may be more accurate.
Does inflation affect everyone equally?
No. Inflation impacts depend on your spending mix. Retirees, for example, may experience higher effective inflation because healthcare costs tend to rise faster than the general CPI.
How does inflation relate to interest rates?
Central banks typically raise interest rates to slow inflation. Higher rates increase borrowing costs but can also increase savings yields, partially offsetting purchasing power loss.
Can I use this to adjust a salary for inflation?
Yes. Enter your current salary as the amount and the projected inflation rate to see what that salary would need to be in future years to maintain the same purchasing power.