About the Inflation Calculator
An inflation calculator shows how the purchasing power of money changes over time at a given inflation rate. It is the calculation that reveals why a salary that seems adequate now may not be in twenty years, and why cash loses value even while its nominal amount stays fixed.
The formula
Future cost = amount · (1 + rate)^yearsThe rate is the average annual inflation. The result shows what an item costing the entered amount today will cost in the future, or equivalently how much purchasing power a fixed sum loses.
How to use this calculator
- 1Enter your Initial Amount ($). The field starts at
100, which you can overwrite. - 2Enter your Average Inflation Rate (%). The field starts at
3, which you can overwrite. - 3Enter your Years. The field starts at
10, which you can overwrite. - 4Read the result straight away — it recalculates as you type, so there is no button to press. Use Share to copy a link that reopens the page with your exact numbers filled in.
Worked example
| Input | Value |
|---|---|
| Initial Amount ($) | 100 |
| Average Inflation Rate (%) | 3 |
| Years | 10 |
Result
Future Cost: $134.39
Those are the values the page loads with, so you can reproduce this result yourself and then change one field at a time to see what drives the outcome.
Understanding your result
Inflation compounds like interest, only against you. At 3 percent, prices double roughly every 24 years — so 100 dollars of goods today costs about 134 in ten years and 181 in twenty. Money held in cash loses purchasing power at exactly that rate.
This is why the real return on an investment matters more than the nominal one. A savings account paying 2 percent while inflation runs at 3 percent is losing 1 percent of purchasing power annually, despite the balance growing. Over a retirement lasting thirty years, ignoring inflation is one of the most consequential planning errors possible.
Things worth knowing
- Long-run US inflation has averaged roughly 3 percent, though individual decades have varied enormously.
- The rule of 72 works here too: at 3 percent inflation, prices double in about 24 years.
- Real return equals nominal return minus inflation, and it is what determines whether you are actually gaining.
- Personal inflation rates differ from headline figures depending on your spending mix — healthcare and education have risen faster.
- Inflation-linked bonds and equities have historically offered better inflation protection than cash.
Frequently asked questions
How does inflation affect my savings?+
It reduces what your money can buy. At 3 percent inflation, cash loses about a quarter of its purchasing power over ten years even though the nominal balance is unchanged.
What is a normal inflation rate?+
Central banks in developed economies typically target around 2 percent. Long-run US inflation has averaged near 3 percent, with periods well above and below.
What is the difference between nominal and real returns?+
Nominal is the stated return; real subtracts inflation and reflects the change in purchasing power. A 5 percent nominal return with 3 percent inflation is a 2 percent real return.
How can I protect savings from inflation?+
Hold assets that historically outpace inflation — equities, property, and inflation-linked bonds. Cash is safe nominally but guaranteed to lose purchasing power at the inflation rate.