Inflation Calculator — How much will $100 today cost in 20 years? What did $100 in 2000 buy in 2024? This calculator answers both. Enter an amount, a number of years, and an annual inflation rate, and the tool shows the future cost and the equivalent purchasing power in today's dollars.
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What is inflation calculator?
How much will $100 today cost in 20 years? What did $100 in 2000 buy in 2024? This calculator answers both. Enter an amount, a number of years, and an annual inflation rate, and the tool shows the future cost and the equivalent purchasing power in today's dollars.
For quick historical comparisons, pick a year from the U.S. CPI table (1990 onward). The long-run U.S. inflation rate is around 3.2% per year — a useful default for general planning.
How to use it
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Enter the amount
In today's dollars.
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Enter the number of years
How far into the future (or past) to project.
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Pick a rate
Custom annual rate, or use a historical U.S. CPI year.
Examples
$100 in 1990 → 2024 (34 years at ~2.5%)
Historical CPI mode.
Result: ~$233 today
$50,000 salary in 20 years at 3% inflation
Future cost mode.
Result: ~$90,306 in 2046 dollars
Frequently asked questions
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Last reviewed: 2026-08-22