UK inflation rate in 1821: -11.97%

UK Inflation Calculator


Inflation in 1821 and Its Effect on Pound Value

Purchasing power increased by 11.97% in 1821 compared to 1820. On average, you would have to spend 11.97% less money in 1821 than in 1820 for the same item. This is an example of deflation.

In other words, £1 in 1820 is equivalent in purchasing power to about £0.88 in 1821.

The 1820 inflation rate was -9.30%. The inflation rate in 1821 was -11.97%. The 1821 inflation rate is lower compared to the average inflation rate of 2.40% per year between 1821 and 2019.

Inflation rate is calculated by change in the composite price index (CPI). The CPI in 1821 was 10.30. It was 11.70 in the previous year, 1820. The difference in CPI between the years is used by the Office for National Statistics to officially determine inflation. Because the 1821 CPI is less than 1820 CPI, negative inflation (also known as deflation) has occurred.

Inflation from 1820 to 1821
Average inflation rate -11.97%
Converted amount (£1 base) £0.88
Price difference (£1 base) £-0.12
CPI in 1820 11.700
CPI in 1821 10.300
Inflation in 1820 -9.30%
Inflation in 1821 -11.97%

UK inflation chart from 1988 to 2017. Based on the UK Consumer Price Index.

How to Calculate Inflation Rate for £1, 1820 to 1821

This inflation calculator uses the following inflation rate formula:

CPI in 1821CPI in 1820
1820 GBP value
1821 GBP value

Then plug in historical CPI values. The UK CPI was 11.7 in the year 1820 and 10.3 in 1821:


£1 in 1820 has the same "purchasing power" or "buying power" as £0.88 in 1821.

To get the total inflation rate for the 1 years between 1820 and 1821, we use the following formula:

CPI in 1821 - CPI in 1820CPI in 1820
Cumulative inflation rate (1 years)

Plugging in the values to this equation, we get:

10.3 - 11.711.7

News headlines from 1820

Politics and news often influence economic performance. Here's what was happening at the time:

  • The Astronomical Society of London, is founded, it is now known as the Royal Astronomical Society.
  • Fabian Gottlieb von Bellingshausen and Mikhail Lazarev discover Antarctica.

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 2017, which is based on The Bank of England's forecast.

You may use the following MLA citation for this page: “Inflation Rate in 1821 | UK Inflation Calculator.” U.S. Official Inflation Data, Alioth Finance, 21 Apr. 2019,

Special thanks to QuickChart for providing downloadable chart images. is a reference website maintained by the Official Data Foundation.

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