Inflation Calculator

How inflation changes money

Inflation is the gradual rise in prices, which means each unit of money buys a little less over time. To move an amount forward, the calculator compounds it by the inflation rate every year: future value = amount × (1 + rate)^years, where rate is the average annual inflation written as a decimal. At 3% inflation, $1,000 of spending power needs about $1,806 to buy the same basket of goods twenty years later. The forward result therefore tells you how many future dollars are required to match today's purchasing power — useful for budgeting a long-term goal, a future tuition bill or a retirement income target.

Looking backward in time

The past direction reverses the math: past value = amount ÷ (1 + rate)^years. It answers "what was this amount worth in earlier money?" by discounting instead of compounding. This is how you compare a salary, price or budget from years ago with today's money, or express a future sum in present-day terms. The "buying power kept" figure shows how much of the original purchasing power survives over the period — at 3% for twenty years, roughly 55% remains, meaning inflation quietly erodes nearly half of a cash amount's value across two decades. Seeing both directions makes the long, slow effect of even modest inflation concrete.

Accuracy and assumptions

This tool uses a single average rate, but real inflation moves year to year and varies by category — housing, food, energy and services rarely rise in lockstep. For a precise historical conversion, use official consumer price index figures for the exact start and end dates rather than one blended rate. The calculator does not fetch any live data; you supply the rate, which keeps it private and lets you test optimistic and pessimistic scenarios. Everything is computed locally in your browser, so treat the output as a clear, educational approximation rather than an exact economic measurement.