From Jan 2017 to Sep 2026 the index went from 214.1 to 285.1, a change of +33.2%.
Highest reading in that period: 316.1 in May 2022. Lowest: 202.6 in Jan 2020.
Largest one-month rise: +7.6% in Jan 2023. Largest one-month fall: -8.4% in Aug 2023.
The year-over-year change stayed within 10% either way in each of the last 36 months, so a 10% annual cap or floor would not have been reached.
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 — Hardwood Lumber (BLS series WPU0812), 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.]
Divide the current value of BLS series WPU0811 (Softwood Lumber) by its value at contract signing, then apply that ratio to the lumber part of the price. A usable clause also names an averaging window, a rule for revised values and missing months, and a cap.
Let Escalake run this clause for you
Escalake tracks US PPI — Hardwood Lumber, applies your formula, and gives both sides a number they can confirm, no spreadsheet required.