The inflation calculator projects how a price or amount could change under a constant user-provided annual inflation rate. It also estimates the future amount's purchasing power in today's money.
How to use this calculator
Enter the current amount, assumed annual inflation rate, and period in years. The calculation uses a user-provided scenario rate, not historical official inflation data, and labels that distinction in the results.
Formula & calculation method
Future cost = amount × (1 + inflation/100)^years; today's purchasing power = future cost/(1 + inflation/100)^yearsFuture cost estimates the nominal amount needed to purchase the same basket if prices follow the assumed rate. The equivalent purchasing-power result reverses the process and shows what a future nominal amount represents in present terms.
Worked example
At 3% annual inflation for ten years, the price factor is about 1.3439. A 1,000 basket becomes approximately 1,343.92 in nominal future terms under this constant-rate scenario.
Why this is useful
The calculator separates nominal future cost from present purchasing power and makes the scenario source explicit. It is useful for long-term budgeting without implying access to historical official statistics.
Limitations to keep in mind
Inflation varies over time and across goods, services, locations, and households. A constant rate is only an assumption. This tool does not retrieve CPI history or provide an official cost-of-living index.
Frequently asked questions
Does the calculator use official historical inflation data?
No. It compounds the annual rate you enter. The output explicitly identifies it as a user-provided scenario.
Can inflation be negative?
Yes. A negative rate represents deflation in this model, so the future nominal cost may be lower.
Is personal inflation the same as headline inflation?
Not necessarily. Your spending mix can produce a different experienced rate from an official average index.