Percentage calculator
Calculate percentages online, including percent of a number, percentage increase, and percentage decrease.
Inflation calculator
See what money from any year is worth today using official US CPI (from 1913) and UK price data (from 1800), or a custom inflation rate.
How to use Inflation calculator
Find out what money from a past year is worth today, or what today's money was worth back then.
- US dollar: Consumer Price Index for All Urban Consumers (CPI-U), annual averages from 1913, from the Bureau of Labor Statistics
- UK pound: ONS Consumer Prices Index from 1988, with the ONS long-run price series used for 1800–1987
- Custom rate: project future prices at any average inflation rate
The latest year uses the average of the months published so far. Results show cumulative and average yearly inflation, plus a year-by-year table.
Inflation calculator FAQs
Is Inflation calculator free?
Inflation calculator is a free online tool on ReallyUseful.Tools. No account is required.
Does Inflation calculator run in my browser?
Inflation calculator is designed to run in your browser where supported, so files can stay on your device instead of being uploaded to a server.
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