- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 01 Mar 2017
Cost performance index (CPI)
The cost performance index (CPI) is a measure of the financial effectiveness and efficiency of a project. It represents the amount of completed work for every unit of cost spent.
For example, if a project has a budgeted cost of £20,000 but actual costs were £12,000.
CPI = 20,000 / 12,000 = 1.66
If the ratio has a value higher than 1 then it indicates the project is performing well against the budget. A CPI of 1 means that the project is performing on budget. A CPI of less than 1 means that the project is over budget.
 Related articles on Designing Buildings Wiki
Featured articles and news
There are many ways of classifying types of building. Have a look at our range of building articles.
BSRIA have launched the 'major update' of the go-to design framework guide for building services.
How to get results with building life cycle assessment.
Government publishes a prospectus inviting proposals for new 'garden communities'.
The Morandi motorway bridge in Genoa collapses during rainstorm while undergoing maintenance works.
'Developed design' is a phrase coined by the RIBA for their 2013 Plan of Work. But what does it actually mean?
New green paper published aiming to rebalance the relationship between landlords and residents and tackle stigma.
RIBA calls for a comprehensive ban on combustible materials.
Lump sum contracts can be referred to as ‘fixed price’ contracts, although strictly this is not correct. Find out more here.
Ramboll offer guidance to civil engineers on how to make projects 'off-site ready'.
Government announces its Rough Sleeping Strategy, with further funding for social housing.