# £100 in 2017 is worth £105.89 today

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## Why a pound today is worth only 94% of a pound in 2017

Updated: September 11, 2020

According to the Office for National Statistics composite price index, today's prices in 2020 are 5.89% higher than average prices since 2017. This means that a pound today only buys 94.44% of what it could buy in 2017. The British pound experienced an average inflation rate of 1.93% per year during this period, causing the real value of a pound to decrease.

In other words, £100 in 2017 is equivalent in purchasing power to about £105.89 in 2020, a difference of £5.89 over 3 years.

The 2017 inflation rate was 3.58%. The current year-over-year 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 5.89% Average inflation rate 1.93% Converted amount (£100 base) £105.89 Price difference (£100 base) £5.89 CPI in 2017 1,074.900 CPI in 2020 1,138.243 Inflation in 2017 3.58% Inflation in 2020 1.50%

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

## Buying power of £100 in 2017

This chart shows a calculation of buying power equivalence for £100 in 2017 (price index tracking began in 1750).

For example, if you started with £100, you would need to end with £105.89 in order to "adjust" for inflation (sometimes refered to as "beating inflation").

When £100 is equivalent to £105.89 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 2017 dollars, the chart below shows how £100 is worth less over 3 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:

Pound inflation: 2017-2020
Year Pound Value Inflation Rate
2017 £100.00 3.58%
2018 £102.48 2.48%
2019 £104.33 1.80%
2020 £105.89 1.50%*
* Compared to previous annual rate. Not final. See inflation summary for latest 12-month trailing value.

This conversion table shows various other 2017 amounts in today's pounds, based on the 5.89% change in prices:

Conversion Table: Value of a pound today
Initial value Equivalent value
£1 pound in 2017 £1.06 pounds today
£5 pounds in 2017 £5.29 pounds today
£10 pounds in 2017 £10.59 pounds today
£50 pounds in 2017 £52.95 pounds today
£100 pounds in 2017 £105.89 pounds today
£500 pounds in 2017 £529.46 pounds today
£1,000 pounds in 2017 £1,058.93 pounds today
£5,000 pounds in 2017 £5,294.65 pounds today
£10,000 pounds in 2017 £10,589.30 pounds today
£50,000 pounds in 2017 £52,946.48 pounds today
£100,000 pounds in 2017 £105,892.95 pounds today
£500,000 pounds in 2017 £529,464.77 pounds today
£1,000,000 pounds in 2017 £1,058,929.54 pounds today

## How to Calculate Inflation Rate for £100 since 2017

Our calculations use the following inflation rate formula to calculate the change in value between 2017 and today:

CPI today CPI in 2017
×
2017 GBP value
=
Today's value

Then plug in historical CPI values. The U.K. CPI was 1074.9 in the year 2017 and 1138.2433607545 in 2020:

1138.24336075451074.9
×
£100
=
£105.89

£100 in 2017 has the same "purchasing power" or "buying power" as £105.89 in 2020.

To get the total inflation rate for the 3 years between 2017 and 2020, we use the following formula:

CPI in 2020 - CPI in 2017CPI in 2017
×
100
=
Cumulative inflation rate (3 years)

Plugging in the values to this equation, we get:

1138.2433607545 - 1074.91074.9
×
100
=
6%

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

• Donald Trump sworn in as the 45th president of the United States.
• Hurricanes Harvey and Irma strike southeast Texas and Florida, causing extensive flooding and damage.
• Gunman kills 58 people at a Las Vegas concert, making it the deadliest mass shooting in modern U.S. history.
• North Korea tests a hydrogen bomb and over a dozen ballistic missiles amidst soaring tensions with the U.S.

## 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: “Value of 2017 pounds today | UK Inflation Calculator.” Official Inflation Data, Alioth Finance, 28 Sep. 2020, https://www.officialdata.org/uk/inflation/2017?amount=&startYear=&future_pct=.

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.