How Inflation Affects Your Money

Quick Answer

Inflation is the steady rise in the cost of living over time, which means a fixed amount of money buys less each year. To find the future value of money in today terms, divide the amount by (1 + inflation rate) raised to the number of years. For example, at 3% inflation, $100,000 will buy what about $47,761 buys today after 25 years.

How It Works

Inflation compounds, just like interest, but it works against you. Each year prices rise by a percentage of the new, higher level, so the cumulative effect over decades is much larger than the annual rate suggests. The same force that grows savings through compounding shrinks the buying power of idle cash.

The tool reports two views: the real value (what your money will buy, in today terms) and the future nominal cost (what the same goods will cost in future dollars). They are two sides of the same calculation.

Examples

Purchasing power. $100,000 at 3% inflation keeps the buying power of about $47,761 after 25 years. Nearly half the real value quietly disappears.

Future cost. The same goods that cost $100,000 today would nominally cost about $209,378 in 25 years at 3% inflation.

The Formula

Real value = Amount / (1 + f)^t

where f is the annual inflation rate as a decimal and t is the number of years. The future nominal cost flips the division to a multiplication: Amount × (1 + f)^t.

Common Mistakes