£4 in 1800 is equivalent in purchasing power to about £343.69 today, an increase of £339.69 over 221 years. The pound had an average inflation rate of 2.04% per year between 1800 and today, producing a cumulative price increase of 8,492.23%.

This means that today's prices are 85.92 times higher than average prices since 1800, according to the Office for National Statistics composite price index. A pound today only buys 1.16% of what it could buy back then.

The 1800 inflation rate was 36.36%. The current year-over-year inflation rate (2020 to 2021) is now 0.70%^{1}.
If this number holds, £4 today will be equivalent in buying power to £4.03 next year.

⌃

Cumulative price change | 8,492.23% |

Average inflation rate | 2.04% |

Converted amount (£4 base) | £343.69 |

Price difference (£4 base) | £339.69 |

CPI in 1800 | 13.500 |

CPI in 2021 | 1,159.951 |

Inflation in 1800 | 36.36% |

Inflation in 2021 | 0.70% |

£4 in 1800 | £343.69 in 2021 |

This chart shows a calculation of buying power equivalence for £4 in 1800 (price index tracking began in 1750).

For example, if you started with £4, you would need to end with £343.69 in order to "adjust" for inflation (sometimes refered to as "beating inflation").

When £4 is equivalent to £343.69 over time, that means that the "real value" of a single U.K. pound decreases over time. In other words, a pound will pay for fewer items at the store.

This effect explains how inflation erodes the value of a pound over time. By calculating the value in 1800 dollars, the chart below shows how £4 is worth less over 221 years.

According to the Office for National Statistics, each of these GBP amounts below is equal in terms of what it could buy at the time:

This conversion table shows various other 1800 amounts in today's pounds, based on the 8,492.23% change in prices:

Initial value | Equivalent value |
---|---|

£1 pound in 1800 | £85.92 pounds today |

£5 pounds in 1800 | £429.61 pounds today |

£10 pounds in 1800 | £859.22 pounds today |

£50 pounds in 1800 | £4,296.11 pounds today |

£100 pounds in 1800 | £8,592.23 pounds today |

£500 pounds in 1800 | £42,961.15 pounds today |

£1,000 pounds in 1800 | £85,922.29 pounds today |

£5,000 pounds in 1800 | £429,611.46 pounds today |

£10,000 pounds in 1800 | £859,222.92 pounds today |

£50,000 pounds in 1800 | £4,296,114.59 pounds today |

£100,000 pounds in 1800 | £8,592,229.17 pounds today |

£500,000 pounds in 1800 | £42,961,145.85 pounds today |

£1,000,000 pounds in 1800 | £85,922,291.70 pounds today |

Our calculations use the following inflation rate formula to calculate the change in value between 1800 and today:

CPI today
CPI in 1800

×

1800 GBP value

=

Today's value

Then plug in historical CPI values. The U.K. CPI was 13.5 in the year 1800 and 1159.950938 in 2021:

1159.95093813.5

×

£4

=

£4 in 1800 has the same "purchasing power" or "buying power" as £343.69 in 2021.

To get the total inflation rate for the 221 years between 1800 and 2021, we use the following formula:

CPI in 2021 - CPI in 1800CPI in 1800

×

100

=

Plugging in the values to this equation, we get:

1159.950938 - 13.513.5

×

100

=

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

- First session of Congress held at under-construction Capitol building in Washington D.C.
- First cowpox vaccination (for smallpox prevention) in the United States. The vaccine was given by Dr Benjamin Waterhouse to his son.
- The free African American community of Philadelphia submits its first petition to US Congress for the abolition of slavery.
- Barnaba Niccoclo Maria Luigi Chiaramonti elected pope, taking the name Pope Pius VII.
- A Smallpox vaccine is invented by Doctor Benjamin Waterhouse leading to the first immunization against the disease.
- Congress holds its first session in the, at the time, still incomplete Capitol building in Washington D.C.
- The French army defeats the Turks at Helipolis, after which they advanced on to Cairo.

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: “£4 in 1800 → 2021 | UK Inflation Calculator.” Official Inflation Data, Alioth Finance, 28 Sep. 2021, https://www.officialdata.org/uk/inflation/1800?amount=4.

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.

Cumulative price change | 8,492.23% |

Average inflation rate | 2.04% |

Converted amount (£4 base) | £343.69 |

Price difference (£4 base) | £339.69 |

CPI in 1800 | 13.500 |

CPI in 2021 | 1,159.951 |

Inflation in 1800 | 36.36% |

Inflation in 2021 | 0.70% |

£4 in 1800 | £343.69 in 2021 |