Value of £100 from 1999 to 2018
£100 in 1999 is equivalent in purchasing power to about £169.18 in 2018, an increase of £69.18 over 19 years. The pound had an average inflation rate of 2.81% per year between 1999 and 2018, producing a cumulative price increase of 69.18%.
This means that prices in 2018 are 1.69 times as high as average prices since 1999, according to the Office for National Statistics composite price index.
The inflation rate in 1999 was 1.54%. The inflation rate in 2018 was 2.70%. The 2018 inflation rate is lower compared to the average inflation rate of 4.25% per year between 2018 and 2024.
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| Cumulative price change | 69.18% |
| Average inflation rate | 2.81% |
| Converted amount £100 base | £169.18 |
| Price difference £100 base | £69.18 |
| CPI in 1999 | 652.500 |
| CPI in 2018 | 1,103.922 |
| Inflation in 1999 | 1.54% |
| Inflation in 2018 | 2.70% |
| £100 in 1999 | £169.18 in 2018 |
Buying power of £100 in 1999
This chart shows a calculation of buying power equivalence for £100 in 1999 (price index tracking began in 1750).
For example, if you started with £100, you would need to end with £169.18 in order to "adjust" for inflation (sometimes refered to as "beating inflation").
When £100 is equivalent to £169.18 over time, that means that the "real value" of a single U.K. pound decreases over time. In other words, a pound will pay for fewer items at the store.
This effect explains how inflation erodes the value of a pound over time. By calculating the value in 1999 dollars, the chart below shows how £100 is worth less over 19 years.
According to the Office for National Statistics, each of these GBP amounts below is equal in terms of what it could buy at the time:
This conversion table shows various other 1999 amounts in 2018 pounds, based on the 69.18% change in prices:
| Initial value | Equivalent value |
|---|---|
| £1 pound in 1999 | £1.69 pounds in 2018 |
| £5 pounds in 1999 | £8.46 pounds in 2018 |
| £10 pounds in 1999 | £16.92 pounds in 2018 |
| £50 pounds in 1999 | £84.59 pounds in 2018 |
| £100 pounds in 1999 | £169.18 pounds in 2018 |
| £500 pounds in 1999 | £845.92 pounds in 2018 |
| £1,000 pounds in 1999 | £1,691.83 pounds in 2018 |
| £5,000 pounds in 1999 | £8,459.17 pounds in 2018 |
| £10,000 pounds in 1999 | £16,918.35 pounds in 2018 |
| £50,000 pounds in 1999 | £84,591.75 pounds in 2018 |
| £100,000 pounds in 1999 | £169,183.49 pounds in 2018 |
| £500,000 pounds in 1999 | £845,917.47 pounds in 2018 |
| £1,000,000 pounds in 1999 | £1,691,834.94 pounds in 2018 |
How to calculate inflation rate for £100, 1999 to 2018
Our calculations use the following inflation rate formula to calculate the change in value between 1999 and 2018:
CPI in 2018 CPI in 1999
×
1999 GBP value
=
2018 GBP value
Then plug in historical CPI values. The U.K. CPI was 652.5 in the year 1999 and 1103.9223 in 2018:
1103.9223652.5
×
£100
=
£169.18
£100 in 1999 has the same "purchasing power" or "buying power" as £169.18 in 2018.
To get the total inflation rate for the 19 years between 1999 and 2018, we use the following formula:
CPI in 2018 - CPI in 1999CPI in 1999
×
100
=
Cumulative inflation rate (19 years)
Plugging in the values to this equation, we get:
1103.9223 - 652.5652.5
×
100
=
69%
Data source & citation
Raw data for these calculations comes from the composite price index published by the UK Office for National Statistics (ONS). A composite index is created by combining price data from several different published sources, both official and unofficial. The Consumer Price Index, normally used to compute inflation, has only been tracked since 1988. All inflation calculations after 1988 use the Office for National Statistics' Consumer Price Index, except for the current year, which is based on The Bank of England's forecast.
You may use the following MLA citation for this page: “£100 in 1999 → 2018 | UK Inflation Calculator.” Official Inflation Data, Alioth Finance, 19 Dec. 2024, https://www.officialdata.org/1999-GBP-in-2018?amount=100.
Special thanks to QuickChart for their chart image API, which is used for chart downloads.
in2013dollars.com is a reference website maintained by the Official Data Foundation.
| Cumulative price change | 69.18% |
| Average inflation rate | 2.81% |
| Converted amount £100 base | £169.18 |
| Price difference £100 base | £69.18 |
| CPI in 1999 | 652.500 |
| CPI in 2018 | 1,103.922 |
| Inflation in 1999 | 1.54% |
| Inflation in 2018 | 2.70% |
| £100 in 1999 | £169.18 in 2018 |