Value of £100 from 1920 to 2018
£100 in 1920 is equivalent in purchasing power to about £4,363.33 in 2018, an increase of £4,263.33 over 98 years. The pound had an average inflation rate of 3.93% per year between 1920 and 2018, producing a cumulative price increase of 4,263.33%.
This means that prices in 2018 are 43.63 times as high as average prices since 1920, according to the Office for National Statistics composite price index.
The inflation rate in 1920 was 15.53%. 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 | 4,263.33% |
| Average inflation rate | 3.93% |
| Converted amount £100 base | £4,363.33 |
| Price difference £100 base | £4,263.33 |
| CPI in 1920 | 25.300 |
| CPI in 2018 | 1,103.922 |
| Inflation in 1920 | 15.53% |
| Inflation in 2018 | 2.70% |
| £100 in 1920 | £4,363.33 in 2018 |
Buying power of £100 in 1920
This chart shows a calculation of buying power equivalence for £100 in 1920 (price index tracking began in 1750).
For example, if you started with £100, you would need to end with £4,363.33 in order to "adjust" for inflation (sometimes refered to as "beating inflation").
When £100 is equivalent to £4,363.33 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 1920 dollars, the chart below shows how £100 is worth less over 98 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 1920 amounts in 2018 pounds, based on the 4,263.33% change in prices:
| Initial value | Equivalent value |
|---|---|
| £1 pound in 1920 | £43.63 pounds in 2018 |
| £5 pounds in 1920 | £218.17 pounds in 2018 |
| £10 pounds in 1920 | £436.33 pounds in 2018 |
| £50 pounds in 1920 | £2,181.66 pounds in 2018 |
| £100 pounds in 1920 | £4,363.33 pounds in 2018 |
| £500 pounds in 1920 | £21,816.65 pounds in 2018 |
| £1,000 pounds in 1920 | £43,633.29 pounds in 2018 |
| £5,000 pounds in 1920 | £218,166.46 pounds in 2018 |
| £10,000 pounds in 1920 | £436,332.92 pounds in 2018 |
| £50,000 pounds in 1920 | £2,181,664.62 pounds in 2018 |
| £100,000 pounds in 1920 | £4,363,329.25 pounds in 2018 |
| £500,000 pounds in 1920 | £21,816,646.25 pounds in 2018 |
| £1,000,000 pounds in 1920 | £43,633,292.49 pounds in 2018 |
How to calculate inflation rate for £100, 1920 to 2018
Our calculations use the following inflation rate formula to calculate the change in value between 1920 and 2018:
CPI in 2018 CPI in 1920
×
1920 GBP value
=
2018 GBP value
Then plug in historical CPI values. The U.K. CPI was 25.3 in the year 1920 and 1103.9223 in 2018:
1103.922325.3
×
£100
=
£4,363.33
£100 in 1920 has the same "purchasing power" or "buying power" as £4,363.33 in 2018.
To get the total inflation rate for the 98 years between 1920 and 2018, we use the following formula:
CPI in 2018 - CPI in 1920CPI in 1920
×
100
=
Cumulative inflation rate (98 years)
Plugging in the values to this equation, we get:
1103.9223 - 25.325.3
×
100
=
4,263%
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 1920 → 2018 | UK Inflation Calculator.” Official Inflation Data, Alioth Finance, 22 Nov. 2024, https://www.officialdata.org/1920-GBP-in-2018?amount=100.
Special thanks to QuickChart for their chart image API, which is used for chart downloads.
| Cumulative price change | 4,263.33% |
| Average inflation rate | 3.93% |
| Converted amount £100 base | £4,363.33 |
| Price difference £100 base | £4,263.33 |
| CPI in 1920 | 25.300 |
| CPI in 2018 | 1,103.922 |
| Inflation in 1920 | 15.53% |
| Inflation in 2018 | 2.70% |
| £100 in 1920 | £4,363.33 in 2018 |