From Jan 2017 to Sep 2026 the index went from 58.3 to 117.2, a change of +101.1%.
Highest reading in that period: 117.2 in Aug 2026. Lowest: 54.1 in Sep 2019.
Largest one-month rise: +29.2% in Jun 2026. Largest one-month fall: -5.6% in Sep 2019.
For a clause that resets its base every year, a 10% cap or floor would have limited the adjustment in 9 of the last 36 months.
Use it in a contract
Draft clause citing this series
A starting point citing this series by name and code. Replace the bracketed terms with your contract's actual scope before use.
The [affected portion] of the Contract Price shall be adjusted using US PPI — Computer Storage Device Manufacturing (BLS series PCU334112334112), published by BLS.
Base Period: the index value published for September 2026 (or the month of contract signing, if different) is the Base Value.
Adjustment: at each Adjustment Date, the Current Value is the most recently published three-month average of the index (the Averaging Window). The Escalation Factor equals Current Value divided by Base Value.
Cap: the Escalation Factor applied under this clause shall not exceed 1.10 or fall below 0.90 (a 10% cap and floor) in any single Adjustment Date, regardless of the index's actual movement.
[Replace bracketed terms with your contract's actual affected-portion definition and adjustment-date schedule before use. This is a drafting starting point, not legal advice.]
Indexes storage hardware, drives and arrays, as a distinct line from servers or networking gear. Useful when a data-center build-out contract breaks storage out as its own procurement category.
Split the contract by what is being built: towers, fiber, data centers, or core network equipment. Towers, fiber and data centers have no single official price index for the finished project, so use a weighted composite of real cost inputs. Data centers have the best coverage: transformers (PCU335311335311) and switchgear (PCU335313335313) both have real, live BLS indices.
Let Escalake run this clause for you
Escalake tracks US PPI — Computer Storage Device Manufacturing, applies your formula, and gives both sides a number they can confirm, no spreadsheet required.