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UK inflation calculator

Convert a pound amount between any two years from 1800 to 2025 with official ONS data: the CPI from 1988 and the long-run price index before that. Total price change, average inflation and a year-by-year table.

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The calculation

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Index in 200072.7
Index in 2025138.4
Change in prices+90.4% over 25 years
Average inflation per year2.61%
£1,000.00 in 2000 buys the same as£1,903.71 in 2025
£1,000.00 in 2025 was worth£525.29 in 2000
Index usedCPI (ONS)

Purchasing power year by year

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Your amount year by year

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YearIndexEquivalent
200072.7£1,000.00
200578.1£1,074.28
201089.4£1,229.71
2015100.0£1,375.52
2020108.7£1,495.19
2025138.4£1,903.71

What £100 from past years is worth in 2025

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Year£100 then is, in 2025Average inflation a year
2020£127.324.9%
2010£154.813.0%
2000£190.372.6%
1990£247.582.6%
1980£602.434.1%
1970£2,173.195.8%
1960£3,235.445.5%
1950£4,813.945.3%
1940£7,864.365.3%
1930£9,182.664.9%
1920£6,279.054.0%
1910£16,547.924.5%
1900£17,267.394.2%
1890£18,052.273.9%

Annual average price index, 2025 as the latest full year.

This calculator is for the United Kingdom and the pound sterling. It uses the consumer prices index (CPI) published by the Office for National Statistics, the measure the Bank of England targets. The CPI starts in 1988; for earlier years the calculator switches to the ONS long-run composite price index, which goes back to 1800, and says so in the result.

How it is calculated

  1. Equivalent amount = amount × (index in the target year ÷ index in the starting year). Annual averages are used.
  2. Total price change = that ratio minus one.
  3. Average annual inflation = ratio1/years − 1.

Example

£1,000 in 2000 is equivalent to about £1,904 in 2025: CPI prices rose 90.4%, an average of 2.61% a year. The US inflation calculator does the same for the dollar.

CPI, CPIH and RPI

The ONS publishes three main measures. CPI is the headline rate. CPIH adds owner occupiers’ housing costs. RPI is an older index that usually runs higher and is still used in some contracts and in index-linked gilts. The long-run index used here before 1988 is based on the RPI, so very long comparisons can come out a little higher than a CPI-only figure would.

Frequently asked questions

How much is £1 from 1900 worth today?

About £173 in 2025, by the ONS long-run composite price index: prices are about 173 times higher, an average of 4.21% a year. Enter 1 and the years above to see the exact figure.

What was the UK inflation rate in 2025?

Measured by annual average CPI, prices in 2025 were 3.4% higher than in 2024. The monthly rate the news reports is the change over the same month a year earlier and moves around more.

How much is £100 from 1950 worth today?

About £4,814 in 2025 money: prices are about 48 times higher than in 1950, an average of 5.30% a year.

Which index should I use for a contract or a pay claim?

Use the one named in the contract. Many older contracts use RPI, newer ones CPI or CPIH. This calculator uses CPI from 1988, which is the official headline measure.

Sources

  1. ONS: CPI INDEX 00: ALL ITEMS 2015=100 (D7BT)
  2. ONS: Composite price index, long-run series from 1800 (CDKO)
  3. Bank of England: Inflation calculator

By Calcelate Team. Formula from the sources above.

  1. 2026-10-06 · Formula and texts checked
  2. 2026-10-06 · Reference data as of this date