UK inflation rate in 1820: -9.30%

UK Inflation Calculator


Inflation in 1820 and Its Effect on Pound Value

Purchasing power increased by 9.30% in 1820 compared to 1819. On average, you would have to spend 9.30% less money in 1820 than in 1819 for the same item. This is an example of deflation.

In other words, £1 in 1819 is equivalent in purchasing power to about £0.91 in 1820.

The 1819 inflation rate was -2.27%. The inflation rate in 1820 was -9.30%. The 1820 inflation rate is lower compared to the average inflation rate of 2.32% per year between 1820 and 2019.

Inflation rate is calculated by change in the composite price index (CPI). The CPI in 1820 was 11.70. It was 12.90 in the previous year, 1819. The difference in CPI between the years is used by the Office for National Statistics to officially determine inflation. Because the 1820 CPI is less than 1819 CPI, negative inflation (also known as deflation) has occurred.

Inflation from 1819 to 1820
Average inflation rate -9.30%
Converted amount (£1 base) £0.91
Price difference (£1 base) £-0.09
CPI in 1819 12.900
CPI in 1820 11.700
Inflation in 1819 -2.27%
Inflation in 1820 -9.30%

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

How to Calculate Inflation Rate for £1, 1819 to 1820

This inflation calculator uses the following inflation rate formula:

CPI in 1820CPI in 1819
1819 GBP value
1820 GBP value

Then plug in historical CPI values. The UK CPI was 12.9 in the year 1819 and 11.7 in 1820:


£1 in 1819 has the same "purchasing power" or "buying power" as £0.91 in 1820.

To get the total inflation rate for the 1 years between 1819 and 1820, we use the following formula:

CPI in 1820 - CPI in 1819CPI in 1819
Cumulative inflation rate (1 years)

Plugging in the values to this equation, we get:

11.7 - 12.912.9

News headlines from 1819

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

  • Sir Stamford Raffles arrives in Singapore
  • Singapore is turned into a British trading port by Sir Stamford Raffles.
  • Introduction of the first bicycles, known as "swift walkers", in New York

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 1820 | 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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