£100.00 in 1990 (year average) = £257.78 in September 2026
Prices rose 157.8% in total (CPI index 55.9 to 144.1, 2015 = 100). That is an average of 2.6% a year over 36.2 years.
Money · ONS consumer price inflation
UK inflation calculator (CPI)
UK CPI inflation was 3.5% in the 12 months to September 2026 (ONS, published 21 October 2026). The October 2026 figure is due on Wednesday 18 November 2026 at 07:00.
3.5%CPI, 12 months to September 2026
What is it worth now?
Runs in your browser, with no run limit; nothing you enter leaves this page
Uses the ONS Consumer Prices Index (all items, 2015 = 100) from January 1988 to September 2026. Pick a month, or “Whole year” for the ONS calendar-year average.
Enter an amount
Worked out as amount × CPI index at the end ÷ CPI index at the start. ONS publishes the index to one decimal place, so a rate worked out from it can differ by 0.1 point from the rate ONS publishes.
Worked answers
What was £100 worth in 1990 and 2000?
To September 2026, from the ONS CPI index. Each button loads the example.
£100.00 in 2000 (year average) = £198.21 in September 2026
Prices rose 98.2% in total (CPI index 72.7 to 144.1, 2015 = 100). That is an average of 2.6% a year over 26.2 years.
£1,000.00 in January 2010 = £1,641.23 in September 2026
Prices rose 64.1% in total (CPI index 87.8 to 144.1, 2015 = 100). That is an average of 3.0% a year over 16.7 years.
£50.00 in 2020 (year average) = £66.28 in September 2026
Prices rose 32.6% in total (CPI index 108.7 to 144.1, 2015 = 100). That is an average of 4.6% a year over 6.2 years.
ONS
UK CPI inflation rate, last 24 months
12-month rate, ONS series D7G7, release of 21 October 2026.
| Month | CPI 12-month rate | CPI index (2015 = 100) |
|---|---|---|
| September 2026 | 3.5% | 144.1 |
| August 2026 | 3.1% | 143.6 |
| July 2026 | 2.9% | 142.9 |
| June 2026 | 2.6% | 142.5 |
| May 2026 | 2.8% | 142.4 |
| April 2026 | 2.8% | 142.1 |
| March 2026 | 3.3% | 141.0 |
| February 2026 | 3.0% | 140.1 |
| January 2026 | 3.0% | 139.5 |
| December 2025 | 3.4% | 140.1 |
| November 2025 | 3.2% | 139.5 |
| October 2025 | 3.6% | 139.8 |
| September 2025 | 3.8% | 139.3 |
| August 2025 | 3.8% | 139.3 |
| July 2025 | 3.8% | 139.0 |
| June 2025 | 3.6% | 138.9 |
| May 2025 | 3.4% | 138.4 |
| April 2025 | 3.5% | 138.2 |
| March 2025 | 2.6% | 136.5 |
| February 2025 | 2.8% | 136.0 |
| January 2025 | 3.0% | 135.4 |
| December 2024 | 2.5% | 135.6 |
| November 2024 | 2.6% | 135.1 |
| October 2024 | 2.3% | 135.0 |
Illustrative only, not a forecast: if prices kept rising at 3.5% a year, something costing £100 now would cost £118.77 in five years.
By year
£100 in each year is worth this in September 2026
Year-average CPI index against September 2026 (144.1).
| Year | CPI index (year average) | £100 is worth in September 2026 |
|---|---|---|
| 2025 | 138.4 | £104.12 |
| 2024 | 133.9 | £107.62 |
| 2023 | 130.5 | £110.42 |
| 2022 | 121.7 | £118.41 |
| 2021 | 111.6 | £129.12 |
| 2020 | 108.7 | £132.57 |
| 2019 | 107.8 | £133.67 |
| 2018 | 105.9 | £136.07 |
| 2017 | 103.4 | £139.36 |
| 2016 | 100.7 | £143.10 |
| 2015 | 100.0 | £144.10 |
| 2014 | 100.0 | £144.10 |
| 2013 | 98.5 | £146.29 |
| 2012 | 96.1 | £149.95 |
| 2011 | 93.4 | £154.28 |
| 2010 | 89.4 | £161.19 |
| 2009 | 86.6 | £166.40 |
| 2008 | 84.7 | £170.13 |
| 2007 | 81.8 | £176.16 |
| 2006 | 79.9 | £180.35 |
| 2005 | 78.1 | £184.51 |
| 2004 | 76.5 | £188.37 |
| 2003 | 75.5 | £190.86 |
| 2002 | 74.5 | £193.42 |
| 2001 | 73.6 | £195.79 |
| 2000 | 72.7 | £198.21 |
| 1999 | 72.1 | £199.86 |
| 1998 | 71.2 | £202.39 |
| 1997 | 70.1 | £205.56 |
| 1996 | 68.8 | £209.45 |
| 1995 | 67.2 | £214.43 |
| 1994 | 65.5 | £220.00 |
| 1993 | 64.2 | £224.45 |
| 1992 | 62.6 | £230.19 |
| 1991 | 60.1 | £239.77 |
| 1990 | 55.9 | £257.78 |
| 1989 | 52.2 | £276.05 |
| 1988 | 49.6 | £290.52 |
Why September matters
Inflation and next April’s benefits
The CPI rate for the 12 months to September (3.5% in 2026) is the figure the government normally uses when it reviews many benefits for the following April; the decision is the Work and Pensions Secretary’s. See the April 2027 benefits increase calculator and the State Pension increase calculator.
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April 2027 benefits increase calculator
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Helpful answers
UK inflation FAQs.
What is the UK inflation rate now?
CPI inflation was 3.5% in the 12 months to September 2026, up from 3.1% the month before (ONS, published 21 October 2026).
When is the next UK inflation figure published?
ONS publishes the October 2026 figure on Wednesday 18 November 2026, at 07:00.
How do you work out inflation between two dates?
Divide the CPI index at the later date by the index at the earlier date and multiply your amount by the result. For example, £100 × (144.1 ÷ 72.7) uses the September 2026 index and the 2000 year average.
What is £100 from 2000 worth today?
£100.00 in 2000 = £198.21 in September 2026: Prices rose 98.2% in total (CPI index 72.7 to 144.1, 2015 = 100).
Why does this use CPI and not RPI?
CPI is the UK’s headline measure of inflation and the one the Bank of England’s 2% target is set on. RPI is no longer a National Statistic.
Data downloaded from ONS on 31 October 2026 (release of 21 October 2026). Sources: ONS, CPI index D7BT; ONS, CPI annual rate D7G7; ONS, Consumer price inflation, UK: September 2026.