Inflation calculator
Model future costs and purchasing power using an inflation rate you provide.
Use the selected decimal separator and no thousands separators. Amounts: 0–1e12. Results round to two decimal places; calculations retain full floating-point precision. Inflation: −99% to 100%. Years: 0–100. Outputs above 1e100 are rejected.
Illustrative calculations, not personal financial advice. Constant user-entered rates; no taxes, fees, market data or guarantees.
Calculated on your device. Financial entries are not uploaded or saved.
Calculation schedule
Table values are rounded for display. CSV contains every row; displayed rounded rows may not sum exactly.
Formula and worked example
For annual inflation i and years t, future cost = amount × (1+i)^t; future purchasing power = amount ÷ (1+i)^t. With 1000 and 3% for 10 years, the same purchase costs 1343.92, while 1000 then buys about 744.09 in today’s money.
Questions and assumptions
Does this use official inflation data?
No. You supply a constant hypothetical rate. Future cost and purchasing power answer opposite questions and are shown separately. Negative rates model deflation. Supported inflation rates are −99% to 100%, years 0–100. No country-specific CPI series or live economic data is fetched.