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.
Calculations are local. No data leaves your device.
Estimates use average annual inflation and are for education only, not financial advice. Real-world price changes vary by category and region. Consult a financial professional for planning decisions.
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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
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Last reviewed: 2026-09-24