Source: https://www.quantsurv.com/library/tools/price-change-calculation Content format: Markdown version of the public page. Content reviewed: 2026-10-14 # Price change calculation Compare baseline and current input prices and calculate an adjustment using the agreed eligible proportion. by [Jack Butler-Kettle]() · About 2 min readShare ## How to use it Record the contract provision, base date, current date and comparable source. An observed price increase is not automatically recoverable. ### Price change calculation Record the contract provision, base date, current date and comparable source. An observed price increase is not automatically recoverable. [Download blank Excel workbook]() Free blank template for your own project. The completed example is shown below. No email address required. View the completed example Completed fictional example Westhaven refurbishment · 14 October 2026 · Version 1.0 #### Price change calculation Scroll across if needed to read the whole record. A dash means no value has been entered. Price change calculation: completed fictional example | Item / source | Quantity | Base unit price (£) | Current unit price (£) | Eligible proportion | Calculated adjustment (£) | Contract basis / status | | --- | --- | --- | --- | --- | --- | --- | | Steel sections / supplier Q-01 and Q-18 | 10 | £800.00 | £920.00 | 100% | £1,200.00 | Illustrative agreed price adjustment for 10 tonnes | | Board / supplier Q-02 and Q-19 | 500 | £8.00 | £9.00 | 0% | £0.00 | Fixed-price item; no adjustment basis identified | Eligible proportion is 1 for 100% and 0 for none. The £1,200 example adjustment assumes an express agreed basis; it is not a statutory escalation entitlement. ## Understanding your results Eligible proportion is 1 for 100% and 0 for none. The £1,200 example adjustment assumes an express agreed basis; it is not a statutory escalation entitlement. ## How it works The workbook provides blank working records. Grey cells calculate from the entered inputs; yellow cells are for your information. The completed example stays on this page. Read the [related guidance]() for the context and checks behind this template. If you need help preparing or reviewing the project records, our [quantity surveying services]() explain the tasks available under a separate appointment. Agree the deliverable, responsibilities and required specialist input before work starts. [Browse the Library]()