Value of £100 from 1815 to 1984
£100 in 1815 is equivalent in purchasing power to about £2,770.08 in 1984, an increase of £2,670.08 over 169 years. The pound had an average inflation rate of 1.98% per year between 1815 and 1984, producing a cumulative price increase of 2,670.08%.
This means that prices in 1984 are 27.70 times as high as average prices since 1815, according to the Office for National Statistics composite price index.
The inflation rate in 1815 was -10.56%. The inflation rate in 1984 was 4.98%. The 1984 inflation rate is higher compared to the average inflation rate of 3.51% per year between 1984 and 2025.
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| Cumulative price change | 2,670.08% |
| Average inflation rate | 1.98% |
| Converted amount £100 base | £2,770.08 |
| Price difference £100 base | £2,670.08 |
| CPI in 1815 | 12.700 |
| CPI in 1984 | 351.800 |
| Inflation in 1815 | -10.56% |
| Inflation in 1984 | 4.98% |
| £100 in 1815 | £2,770.08 in 1984 |
Buying power of £100 in 1815
This chart shows a calculation of buying power equivalence for £100 in 1815 (price index tracking began in 1750).
For example, if you started with £100, you would need to end with £2,770.08 in order to "adjust" for inflation (sometimes refered to as "beating inflation").
When £100 is equivalent to £2,770.08 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 1815 dollars, the chart below shows how £100 is worth less over 169 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 1815 amounts in 1984 pounds, based on the 2,670.08% change in prices:
| Initial value | Equivalent value |
|---|---|
| £1 pound in 1815 | £27.70 pounds in 1984 |
| £5 pounds in 1815 | £138.50 pounds in 1984 |
| £10 pounds in 1815 | £277.01 pounds in 1984 |
| £50 pounds in 1815 | £1,385.04 pounds in 1984 |
| £100 pounds in 1815 | £2,770.08 pounds in 1984 |
| £500 pounds in 1815 | £13,850.39 pounds in 1984 |
| £1,000 pounds in 1815 | £27,700.79 pounds in 1984 |
| £5,000 pounds in 1815 | £138,503.94 pounds in 1984 |
| £10,000 pounds in 1815 | £277,007.87 pounds in 1984 |
| £50,000 pounds in 1815 | £1,385,039.37 pounds in 1984 |
| £100,000 pounds in 1815 | £2,770,078.74 pounds in 1984 |
| £500,000 pounds in 1815 | £13,850,393.70 pounds in 1984 |
| £1,000,000 pounds in 1815 | £27,700,787.40 pounds in 1984 |
How to calculate inflation rate for £100, 1815 to 1984
Our calculations use the following inflation rate formula to calculate the change in value between 1815 and 1984:
CPI in 1984 CPI in 1815
×
1815 GBP value
=
1984 GBP value
Then plug in historical CPI values. The U.K. CPI was 12.7 in the year 1815 and 351.8 in 1984:
351.812.7
×
£100
=
£2,770.08
£100 in 1815 has the same "purchasing power" or "buying power" as £2,770.08 in 1984.
To get the total inflation rate for the 169 years between 1815 and 1984, we use the following formula:
CPI in 1984 - CPI in 1815CPI in 1815
×
100
=
Cumulative inflation rate (169 years)
Plugging in the values to this equation, we get:
351.8 - 12.712.7
×
100
=
2,670%
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 1815 → 1984 | UK Inflation Calculator.” Official Inflation Data, Alioth Finance, 25 Dec. 2025, https://www.officialdata.org/uk/inflation/1815?amount=100&endYear=1984.
Special thanks to QuickChart for their chart image API, which is used for chart downloads.
| Cumulative price change | 2,670.08% |
| Average inflation rate | 1.98% |
| Converted amount £100 base | £2,770.08 |
| Price difference £100 base | £2,670.08 |
| CPI in 1815 | 12.700 |
| CPI in 1984 | 351.800 |
| Inflation in 1815 | -10.56% |
| Inflation in 1984 | 4.98% |
| £100 in 1815 | £2,770.08 in 1984 |