How to use the inflation calculator
- 1 Enter the amount in pounds.
- 2 Choose the from year, when the money was spent or earned.
- 3 Choose the to year; pick 2026 for today's prices.
- 4 Read the adjusted value, the total price change and the average yearly inflation.
Worked example
£100 in 2000. The CPI index was 72.7 in 2000 and 144.1 in September 2026, so prices rose 98.2%. £100 in 2000 is worth £198.21 today, an average of 2.7% a year. Put the other way, £100 today would have bought what £50.45 bought in 2000, and £100 in 1990 is worth £257.78 now.
Beating inflation
- Compare your savings rate with CPI: below it, cash loses buying power.
- Ask for inflation-linked pay rises: check the latest CPI figure first.
- Use ISAs and pensions for long-term money.
- Look at real returns: interest minus inflation.
Compare interest with the Savings Interest Calculator, check a raise with the Pay Rise Calculator, and plan retirement with the Pension Pot Calculator.
Features
Official ONS data
CPI index D7BT, 2015 = 100, annual averages from 1988 to 2025.
Latest month
2026 uses September 2026, the most recent figure.
Both directions
Works forwards to today or backwards to the past.
When to use it
Pay rises
See whether your pay has kept up with prices. Work out a raise with the Pay Rise Calculator.
Savings
See how much buying power cash loses each year. Compare interest with the Savings Interest Calculator.
Old prices
Find what a house, car or wage from the past is worth now.
Pensions
Check how far a fixed income falls behind. Plan ahead with the Pension Pot Calculator.
Related Savings and Investing tasks
Frequently asked questions
What is the UK inflation rate now?
CPI inflation was 3.5% in the 12 months to September 2026, up from 3.1% in August, according to the ONS release of 21 October 2026. The next figure is due on 18 November 2026.
What is £100 in 2000 worth today?
About £198 in September 2026 prices. Prices roughly doubled over that time, an average of about 2.7% a year.
Which inflation measure does this use?
The Consumer Prices Index (CPI), the UK's headline measure and the one the Bank of England targets at 2%. It uses annual averages for each year and the latest monthly index for 2026.
Why does it start in 1988?
The official CPI series begins in 1988. Before that, the Retail Prices Index (RPI) is used for long-run comparisons, and it usually shows higher inflation than CPI.
What is the difference between CPI and RPI?
Both measure price rises, but RPI uses a different formula and includes mortgage interest, so it usually runs about 0.5 to 1 percentage point higher. RPI is no longer a national statistic but is still used for some student loans and rail fares.
What is CPIH?
CPI plus owner occupiers' housing costs and council tax. The ONS treats it as its lead measure, but CPI remains the headline figure in the news and for the Bank of England target.
Why did inflation jump in 2022?
Energy and food prices surged after the pandemic and the war in Ukraine. CPI peaked at 11.1% in October 2022, the highest for 41 years.
How is the average yearly rate worked out?
It is the compound rate that turns the starting index into the ending index over the number of years, so it smooths out good and bad years.
How often is the data updated?
The ONS publishes CPI every month, usually on a Wednesday mid-month. We review this calculator after each release.
Results are estimates based on the official rates linked above. Confirm important figures with the issuing authority or a qualified adviser before you act on them.
Built and reviewed by Hamza Farooq, founder and lead developer
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