Compare purchasing-power equivalents using a constant assumed rate, or derive a rate from starting and ending amounts.
01 / CALCULATION MODE
02 / ASSUMPTIONS
Hypothetical constant-rate estimate, not a CPI lookup or prediction. Negative annual rates mean deflation and must be greater than −100%.
03 / YOUR RESULT
04 / CALCULATION
Multiplier (1 + rate ÷ 100)^years = 1.34391638. Cumulative inflation = (multiplier − 1) × 100 = 34.3916%. No external inflation rates are used.
All estimates run in your browser; currency only changes display, without exchange rates.
Enter the values you want to compare; processing happens in your browser.
Adjust optional settings and review validation feedback before relying on the estimate.
Review the formulas and equivalent values, then copy the result you need.
Choose future value, present purchasing power or implied rate. Enter positive amounts and a positive number of years, then add a hypothetical inflation or deflation rate where needed.
Future and present equivalents, reverse annual rate and cumulative change with no CPI feed or external lookup.
All amounts and assumptions stay in your browser. These are hypothetical constant-rate estimates, not historical CPI figures or forecasts.
Multiply the starting amount by (1 + assumed annual inflation rate ÷ 100) raised to the number of years. This assumes a constant rate.
Divide a future amount by the same compounded inflation multiplier to estimate its equivalent in today's purchasing power.
Divide ending amount by starting amount, raise that ratio to the power of 1 divided by years, subtract 1 and multiply by 100.
Yes. A rate between -100% and 0% models hypothetical deflation. Rates at or below -100% cannot produce a positive compounding multiplier.
No. It uses only the constant rate or amounts you enter. It neither retrieves government CPI data nor predicts future inflation.
No. Calculations run in browser memory and currency selection changes display only, without conversions or uploads.