Inflation Calculator
Compare the value of money across years using inflation rates.
Equivalent in the future
£1,280.08
2.5% inflation over 10 years
Buying power loss
£280.08
Total change
28.01%
Starting amount
£1,000.00
Uses a constant annual rate for illustration. Actual CPI varies year to year.
In-depth explanation
See what an amount is worth after years of inflation (future value), or what a future/past amount equals in today’s money. Everything runs locally in your browser — your inputs are not uploaded to produce the result.
You enter a constant annual rate for illustration. Real CPI varies by year and basket. Future value grows today’s money forward. Past value discounts a later amount back to today’s purchasing power.
Only the suggested starting inflation rate differs. You can override it for either country. Use Inflation Calculator for quick planning; confirm important money, tax, or health decisions with an official source or professional when needed.
A constant rate is a teaching tool. Real CPI jumps around and the basket may not match your spending (rent vs electronics). “Average 2%” for a decade can still hide a painful two-year spike.
Future value grows money forward; past value asks what a later amount is worth in today’s pounds or dollars. Official CPI tables beat a single assumed rate when you are arguing about a historic contract.
Frequently asked questions
Is this official CPI?
No — you enter a constant annual rate for illustration. Real CPI varies by year and basket.
Future vs past value?
Future value grows today’s money forward. Past value discounts a later amount back to today’s purchasing power.
Why do UK and US defaults differ?
Only the suggested starting inflation rate differs. You can override it for either country.
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