UK RPI all items index
UK RPI all items index stood at 421.6 in Aug 2026, according to Office for National Statistics (ONS). It is one of the indicators in the Consumer price inflation table (Value · Monthly), with a complete series running from Jan 1987 to Aug 2026. The complete series with an interactive chart, free to download.
This indicator in the Consumer price inflation table
| Indicator | 08-2026 | 07-2026 | 06-2026 | 05-2026 | 04-2026 | 03-2026 | 02-2026 | 01-2026 | 12-2025 | 11-2025 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Retail Prices Index (RPI) | |||||||||||
| RPI all items index (Jan 1987=100) | 421.6 | 419.1 | 416.5 | 415.3 | 414.4 | 411.4 | 408.2 | 406.4 | 408.5 | 405.6 | |
| RPIX index, excluding mortgage interest | 414.6 | 412.2 | 409.7 | 408.6 | 407.6 | 404.5 | 401.4 | 399.7 | 401.9 | 399 |
Understanding UK RPI all items index
Calculating the historical baseline of retail inflation across the United Kingdom, this index aggregates the prices of a broad basket of goods and services purchased by households. Unlike the consumer price measures, this legacy series explicitly incorporates mortgage interest payments and house depreciation costs, reflecting the actual cost of homeownership alongside routine consumer expenditures. It retains its distinctive arithmetic aggregation formula and extensive historical coverage, setting it apart from geometric-mean indices used in modern standard inflation measures.
Interpreting this series requires careful attention to its methodological divergence from contemporary consumer price metrics, particularly due to the inclusion of housing debt servicing costs which can generate sharp tactical swings during monetary policy adjustments. Analysts typically rely on the twelve-month percentage movement to smooth out predictable intra-year price rhythms, avoiding month-on-month volatility. Revisions are rare once published, but historical continuity is occasionally affected by structural changes in retail collection methods or basket weight updates.
Frequently asked questions
- Why does this series include mortgage interest payments while consumer prices indices do not?
- It treats home acquisition and financing as a direct cost of living for homeowners, whereas standard consumer price indices focus strictly on consumption expenditures.
- Is this measure still widely utilised for official indexation?
- Yes, it remains referenced in legacy long-term contracts, government gilts, and certain regulatory pricing frameworks despite being superseded as the headline macroeconomic target.
- How frequently are the underlying item weightings updated?
- The basket composition is reviewed annually to reflect shifts in household spending habits across the United Kingdom.