Inflation Calculator

What is an inflation calculator?

An inflation calculator shows how the rising cost of living changes the value of money over time. Inflation is the general increase in prices from year to year: when prices rise by 3% in a year, something that costs $100 today will cost about $103 next year. The calculator translates that steady erosion into concrete numbers — either projecting what today's expenses will cost in the future, or showing what a sum of money will really be worth after years of inflation.

This matters because savings that sit still lose purchasing power quietly. A bank balance can grow in nominal terms while buying less and less each year, and an inflation calculator makes that invisible loss visible before you commit to a long-term plan.

How it works

The calculator uses compound growth, the same math behind investment returns, but applied to prices. To find what a cost will be in the future, it uses:

Future cost = present value × (1 + i)^t, where i is the annual inflation rate and t is the number of years.

To find the purchasing power of a sum of money after t years of inflation, it runs the formula in reverse:

Future purchasing power = amount ÷ (1 + i)^t

In plain terms, prices compound upward while the real value of each dollar compounds downward. Even a modest inflation rate does serious damage over decades: at 3% annual inflation, prices roughly double in about 24 years, and a dollar saved today keeps only about half of its buying power. At higher rates the effect accelerates sharply, which is why economists and savers watch inflation so closely.

How to use this calculator

1. Enter the amount of money or the current cost you want to project.
2. Enter the annual inflation rate you want to assume, as a percentage.
3. Enter the number of years in the future you want to look.
4. Read the projected future cost or the remaining purchasing power.
5. Try a few different inflation rates to see how sensitive the result is to your assumption.

Worked example

In this example, take $100,000 of savings and an assumed annual inflation rate of 3% (assumed for illustration) over 20 years. The purchasing power of that sum after 20 years is:

100,000 ÷ (1.03)^20 ≈ $55,368

In other words, if prices rise 3% every year, $100,000 left untouched would buy in 20 years only what about $55,368 buys today — nearly half of its value gone to inflation. Running the formula the other way, a household expense of $1,000 a month today would grow to about $1,806 a month in 20 years at the same assumed rate.

Tips and limitations

• No one knows future inflation. Historical averages are a reasonable starting guess, but actual rates vary widely by country and decade — test both higher and lower rates.
• Inflation is an average across many goods. Your own costs (housing, education, healthcare) may rise faster or slower than the headline rate.
• The calculator shows purchasing power only. It does not subtract taxes, account for investment returns that might offset inflation, or handle deflation scenarios specially.
• For savings planning, compare the assumed inflation rate with the interest rate your savings actually earn; the gap between them is the real change in your wealth.
• These examples use illustrative rates and are for education only — they are not predictions about future prices or investment performance.