U.K. inflation rate in 1809: 9.38%

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Inflation in 1809 and its effect on pound value

£1 in 1808 is equivalent in purchasing power to about £1.09 in 1809. The pound had an average inflation rate of 9.38% per year between 1808 and 1809, producing a cumulative price increase of 9.38%. Purchasing power decreased by 9.38% in 1809 compared to 1808. On average, you would have to spend 9.38% more money in 1809 than in 1808 for the same item.

This means that prices in 1809 are 1.09 times as high as average prices since 1808, according to the Office for National Statistics composite price index.

The inflation rate in 1808 was 4.07%. The inflation rate in 1809 was 9.37%. The 1809 inflation rate is higher compared to the average inflation rate of 2.17% per year between 1809 and 2024.

Inflation rate is calculated by change in the composite price index (CPI). The CPI in 1809 was 14.00. It was 12.80 in the previous year, 1808. The difference in CPI between the years is used by the Office for National Statistics to officially determine inflation.

⌃
Inflation from 1808 to 1809
Average inflation rate9.38%
Converted amount
£1 base		£1.09
Price difference
£1 base		£0.09
CPI in 180812.800
CPI in 180914.000
Inflation in 18084.07%
Inflation in 18099.37%
£1 in 1808£1.09 in 1809
Recent GBP inflation
Annual Rate, the Office for National Statistics CPI
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How to calculate inflation rate for £1, 1808 to 1809

Our calculations use the following inflation rate formula to calculate the change in value between 1808 and 1809:

CPI in 1809 CPI in 1808
×
1808 GBP value
=
1809 GBP value

Then plug in historical CPI values. The U.K. CPI was 12.8 in the year 1808 and 14 in 1809:

1412.8
×
£1
=
£1.09

£1 in 1808 has the same "purchasing power" or "buying power" as £1.09 in 1809.

To get the total inflation rate for the 1 years between 1808 and 1809, we use the following formula:

CPI in 1809 - CPI in 1808CPI in 1808
×
100
=
Cumulative inflation rate (1 years)

Plugging in the values to this equation, we get:

14 - 12.812.8
×
100
=
9%

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: “Inflation Rate in 1809 | UK Inflation Calculator.” Official Inflation Data, Alioth Finance, 25 Apr. 2024, https://www.officialdata.org/UK-inflation-rate-in-1809.

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.

Ian Webster

About the author

Ian Webster is an engineer and data expert based in San Mateo, California. He has worked for Google, NASA, and consulted for governments around the world on data pipelines and data analysis. Disappointed by the lack of clear resources on the impacts of inflation on economic indicators, Ian believes this website serves as a valuable public tool. Ian earned his degree in Computer Science from Dartmouth College.

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Inflation from 1808 to 1809
Average inflation rate9.38%
Converted amount
£1 base		£1.09
Price difference
£1 base		£0.09
CPI in 180812.800
CPI in 180914.000
Inflation in 18084.07%
Inflation in 18099.37%
£1 in 1808£1.09 in 1809