# UK CPI and RPI Inflation Calculator

UK CPI and RPI Inflation Calculator

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Figures based on the Consumer Price Index (CPI) and Retail Price Index (RPI) as at . Source: Office for National Statistics.

UK CPI and RPI Inflation Calculator Results

## How the UK CPI and RPI Inflation Calculator can help you

UK CPI and RPI Inflation Calculator will help you calculate CPI and RPI inflation and how the value of the GBP has changed over the years.

* See US Inflation Calculator here.

## How to use the UK CPI and RPI Inflation Calculator

1. Select the date from;

2. Select the date to;

3. Enter an amount;

3. Click on the “Calculate” button to get the results for UK CPI and RPI Inflation.

## UK CPI and RPI Inflation Calculator Formula

To revalue a sum of money between two periods:

Sum of money (£) times (later date index divided by earlier date index)

e.g., CPI inflation from August 2015 to August 2016:

£100 x (100.9 ) / 100.3  = £100.598

e.g., RPI inflation from August 2015 to August 2016:

£100 x (264.4 ) / 259.8  = £101.770

To calculate a percentage change between any two months:

(later date index minus earlier date index divided by earlier date index) times 100

e.g., CPI Percentage change from August 2015 to August 2016:

(100.9  – 100.3 ) / 100.3  x 100 = 0.598% (CPI)

e.g., RPI Percentage change from August 2015 to August 2016:

(264.4  – 259.8 ) / 259.8  x 100 = 1.770% (RPI)