Value of £1 from 1805 to 1804
£1 in 1805 is equivalent in purchasing power to about £0.86 in 1804. The pound had an average inflation rate of 15.93% per year between 1804 and 1805, producing a cumulative price increase of -13.74%.
This means that prices in 1804 are 13.74% lower than average prices in 1805, according to the Office for National Statistics composite price index.
The inflation rate in 1804 was 2.73%. The inflation rate in 1805 was 15.93%. The 1805 inflation rate is higher compared to the average inflation rate of 2.16% per year between 1805 and 2026.
⌃
| Average inflation rate | 15.93% |
|
Converted amount
£1 base | £0.86 |
|
Price difference
£1 base | £-0.14 |
| CPI in 1805 | 13.100 |
| CPI in 1804 | 11.300 |
| Inflation in 1804 | 2.73% |
| Inflation in 1805 | 15.93% |
| £1 in 1805 | £0.86 in 1804 |
How to calculate inflation rate for £1, 1804 to 1805
Our calculations use the following inflation rate formula to calculate the change in value between 1804 and 1805:
CPI in 1804CPI in 1805
×
1805 GBP value
=
1804 GBP value
Then plug in historical CPI values. The U.K. CPI was 13.1 in the year 1805 and 11.3 in 1804:
11.313.1
×
£1
=
£0.86
£1 in 1805 has the same "purchasing power" or "buying power" as £0.86 in 1804.
To get the total inflation rate for the 1 years between 1804 and 1805, we use the following formula:
CPI in 1804 - CPI in 1805CPI in 1805
×
100
=
Cumulative inflation rate (1 years)
Plugging in the values to this equation, we get:
11.3 - 13.113.1
×
100
=
-14%
Frequently asked questions
How much is £1 from 1805 worth in 1804?
£1 in 1805 has about the same buying power as £0.86 in 1804, based on the composite price index published by the Office for National Statistics. Prices in 1804 are 13.74% lower than they were in 1805.
What was the inflation rate in 1804?
The U.K. inflation rate in 1804 was 2.73%, measured as the change in the composite price index from 1803 to 1804. See inflation in 1804 for more detail.
What has the average inflation rate been from 1804 to 1805?
Prices rose by an average of 15.93% per year between 1804 and 1805, a cumulative increase of 15.93%.
How is this calculated?
Divide the CPI in 1804 (11.3) by the CPI in 1805 (13.1), then multiply by the original amount: 11.3 ÷ 13.1 × £1 = £0.86. See the step-by-step formula above.
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: “£1 in 1805 → 1804 | UK Inflation Calculator.” Official Inflation Data, Alioth Finance, 5 Oct. 2026, https://www.officialdata.org/uk/inflation/1805?amount=1&endYear=1804.
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.
| Average inflation rate | 15.93% |
|
Converted amount
£1 base | £0.86 |
|
Price difference
£1 base | £-0.14 |
| CPI in 1805 | 13.100 |
| CPI in 1804 | 11.300 |
| Inflation in 1804 | 2.73% |
| Inflation in 1805 | 15.93% |
| £1 in 1805 | £0.86 in 1804 |