£1 in 1819 is equivalent in purchasing power to about £0.91 in 1820.
The pound had an average **deflation** rate of -9.30% per year since 1819, producing a cumulative price change of -9.30%.
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**.

This means that prices in 1820 are 9.3% lower than average prices since 1819, according to the Office for National Statistics composite price index.

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 2.31% per year between 1820 and 2021.

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.

⌃

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% |

£1 in 1819 | £0.91 in 1820 |

Our calculations use the following inflation rate formula to calculate the change in value between 1819 and 1820:

CPI in 1820
CPI in 1819

×

1819 GBP value

=

1820 GBP value

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

11.712.9

×

£1

=

£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

×

100

=

Plugging in the values to this equation, we get:

11.7 - 12.912.9

×

100

=

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

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.” Official Inflation Data, Alioth Finance, 18 Sep. 2021, https://www.officialdata.org/UK-inflation-rate-in-1820.

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 | -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% |

£1 in 1819 | £0.91 in 1820 |