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Consumer Price Indices (CPI) and Retail Prices Index (RPI) methodology

Documents containing recent guidance on CPI and RPI statistics, published since 2010.

Older documents can be found on the linked “Methodology and articles” pages for 2005 to 2009 and 1998 to 2004.

2015 Type of release
Explaining private rental growth (446 Kb Pdf)   Article 
CPI: a brief guide (323.2 Kb Pdf) Guidance
Research indices using web scraped price data (347.3 Kb Pdf) Article
Research indices using web scraped price data appendix tables (2.44 Mb Excel sheet) Data
Re-referencing of the CPI and CPIH and Introduction of COICOP5 (24.3 Kb Pdf) Article
Trial consumer price indices using web scraped data (611.7 Kb ZIP)   Data 
Revising the weight of Owner Occupiers' Housing in CPIH (197.4 Kb Pdf) Article
Supplementary data (Revising OOH in CPIH) (120.5 Kb Excel sheet) Data

Improvements to the measurement of Owner Occupiers’ Housing Costs and Private Housing Rental Prices (2.48 Mb Pdf)

Supplementary data (Improvements to the measurement of Owner Occupiers' Costs and Private Housing Rental Prices) (1.11 Mb Excel sheet) Data
Correspondence with the Bank of England regarding planned changes to consumer price inflation statistics (124.3 Kb Pdf) Correspondence
2014 Type of release
Comparing class-level chain drift for different elementary aggregate formulae using locally collected CPI data (677.2 Kb Pdf) Paper 
Initial investigations into the prevalence of multi-buy discounts and the effect of discount prices on price indices (1.68 Mb Pdf) Paper 
Calculating a Laspeyres version of the UK CPI (166 Kb Pdf) Paper 
Calculating a retrospective superlative CPI for the UK (2.96 Mb Pdf) Paper 
Initial report on experiences with scanner data in ONS (184.6 Kb Pdf) Article
Variation in the inflation experience of UK households, 2003 to 2014 (1.21 Mb Pdf) Article
What is affecting prices in the UK in 2014? (477.2 Kb Pdf) Article
University tuition fees in the CPI (322.3 Kb Pdf) Article
CPIH announcement 14 August 2014 - explanatory note (313.9 Kb Pdf) Correspondence
Review of hedonic quality adjustment in UK consumer price statistics and internationally (130.1 Kb Pdf) Article
Correspondence with the Bank of England regarding planned changes to consumer price inflation statistics (68.3 Kb Pdf) Correspondence
2013 Type of release
Work programme for consumer price statistics (70.6 Kb Pdf) Article
Users and uses of the consumer price inflation statistics (100.5 Kb Pdf) Article
Consumer price inflation revisions policy October 2013 (49.6 Kb Pdf) Article
Explaining the contribution to change in the CPI 12 month rate (37.1 Kb Pdf) Guidance
Introducing the new CPIH measure of consumer price inflation Article
Introducing the new RPIJ measure of consumer price inflation Article
2012 Type of release
Consultation on the recommended method of reflecting owner occupiers' housing costs in a new additional measure of consumer price inflation, and the strategy for consumer price statistics Consultation
Modelling a back series for the CPI, 1950 to 2011 Article
Discussion paper: Results of ONS research into the application of the stochastic and sampling approaches to the choice of elementary aggregate formula (1.11 Mb Pdf) Article
Erwin Diewert report on consumer price statistics in the UK (1.48 Mb Pdf) Article
National Statistician's consultation on options for improving the RPI Consultation 
International comparison of the formula effect between the CPI and RPI (152.2 Kb Pdf) Article 
Report of the triennial review of the CPI and RPI central collection of prices 2012 (1.75 Mb Pdf) Review
2011 Type of release 
Perceptions of consumer price inflation (52.1 Kb Pdf) Article
Reconciliation of the differences between the CPI and the implied price deflator (344.9 Kb Pdf) Article
Consultation on improving the measurement of car prices in the CPI and RPI Consultation
Responding to the open data agenda - an ONS case study: CPI (1 Mb Pdf) Information note
Improving the timeliness of CPI and RPI publication Information note
History and differences between the CPI and RPI Article

Implications of the differences between the CPI and RPI (149.8 Kb Pdf)


How ONS consumer price statistics are used (67.2 Kb Pdf)

Impact of the VAT increase on the CPI (37.5 Kb Pdf) Information note

Measurement of UK consumer price inflation - Royal Statistical Society presentation, January 2011 (587 Kb Powerpoint presentation)

Presentation slides 
Quick guide to inflation rates (32.5 Kb Pdf) Guidance
2010 Type of release 
Consultation - measurement of seasonal items within the CPI and RPI Consultation
Consultation - the redesign of the Consumer Price Indices statistical bulletin Consultation
UK relative regional consumer price levels for goods and services for 2010 Article

CPI and RPI: increased impact of the formula effect in 2010 (61 Kb Pdf)

Information note

CPI and RPI - analysing differences (111.6 Kb Pdf)

Information note
Differences between the RPI and CPI measures of inflation (62.9 Kb Pdf) Information note
Content from the Office for National Statistics.
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