£100 in 2003 → £159.15 in 2020

UK Inflation Calculator

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U.K. Inflation Rate, £100 from 2003 to 2020

According to the Office for National Statistics composite price index, today's prices in 2020 are 59.15% higher than average prices since 2003. The British pound experienced an average inflation rate of 2.77% per year during this period, meaning the real value of a pound decreased.

In other words, £100 in 2003 is equivalent in purchasing power to about £159.15 in 2020, a difference of £59.15 over 17 years.

The 2003 inflation rate was 2.89%. The current inflation rate (2019 to 2020) is now 1.50%1. If this number holds, £100 today will be equivalent in buying power to £101.50 next year.

 Cumulative price change 59.15% Average inflation rate 2.77% Converted amount (£100 base) £159.15 Price difference (£100 base) £59.15 CPI in 2003 715.200 CPI in 2020 1,138.243 Inflation in 2003 2.89% Inflation in 2020 1.50%

GBP Inflation since 1750
Annual Rate, the Office for National Statistics CPI

Buying power of £100 in 2003

This chart shows a calculation of buying power equivalence for £100 in 2003 (price index tracking began in 1750).

For example, if you started with £100, you would need to end with £159.15 in order to "adjust" for inflation (sometimes refered to as "beating inflation").

When £100 is equivalent to £159.15 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 2003 dollars, the chart below shows how £100 buys less over the past 17 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:

Year Pound Value Inflation Rate
2003 £100.00 2.89%
2004 £102.98 2.98%
2005 £105.89 2.82%
2006 £109.27 3.20%
2007 £113.95 4.29%
2008 £118.50 3.99%
2009 £117.87 -0.53%
2010 £123.31 4.61%
2011 £129.73 5.20%
2012 £133.89 3.21%
2013 £137.96 3.04%
2014 £141.22 2.36%
2015 £142.62 0.99%
2016 £145.09 1.74%
2017 £150.29 3.58%
2018 £154.03 2.48%
2019 £156.80 1.80%
2020 £159.15 1.50%*
* Compared to previous annual rate. Not final. See inflation summary for latest 12-month trailing value.
Click to show 11 more rows

How to Calculate Inflation Rate for £100 since 2003

This inflation calculator uses the following inflation rate formula:

CPI in 2020CPI in 2003
×
2003 GBP value
=
2020 GBP value

Then plug in historical CPI values. The U.K. CPI was 715.2 in the year 2003 and 1138.2433607545 in 2020:

1138.2433607545715.2
×
£100
=
£159.15

£100 in 2003 has the same "purchasing power" or "buying power" as £159.15 in 2020.

To get the total inflation rate for the 17 years between 2003 and 2020, we use the following formula:

CPI in 2020 - CPI in 2003CPI in 2003
×
100
=
Cumulative inflation rate (17 years)

Plugging in the values to this equation, we get:

1138.2433607545 - 715.2715.2
×
100
=
59%

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

• Despite a lack of support from the United Nations, a coalition lead by America and Britain invades Iraq.
• Baghdad falls, ending the invasion of Iraq.
• 10 new members are admitted to the European Union after signing the Treaty of Accession in Athens.

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: “2003 pounds in 2020 | UK Inflation Calculator.” Official Inflation Data, Alioth Finance, 21 Feb. 2020, https://www.officialdata.org/uk/inflation/2003?amount=&startYear=&future_pct=.