How We Scale Logs in CNY: Understanding the Doyle and International ¼” Rules
If you’ve ever wondered how we figure out how many board feet are in a log, you’re not alone. Log scaling is both an art and a science—and knowing which rule we use helps you understand exactly what you're getting. We primarily use the Doyle Rule for local mill transactions, because it aligns with industry standards here. For export-quality veneer logs, we use the more precise International ¼" Rule.
What Is Log Scaling?
Log scaling is the process of estimating the number of usable board feet of lumber that can be sawn from a log. Since logs vary in taper, knots, sweep, and defects, scaling rules provide standardized ways to measure volume and determine fair market value.
How We Scale a Log:
When we scale a log, our goal is to estimate the usable board-foot volume. This is how it works in the field:
Measure the Small End Diameter
We start by measuring the diameter inside the bark at the small end of the log. This is where the boards will be cut from, so it’s the true indicator of usable size.Measure the Length
We record the total log length, typically in 2-foot increments. Many logs are 8, 10, 12, 14, or 16 feet long. Length will vary based on grade, and markets. This is where we use our years of expertise to maximize the value of the log.Apply the Scaling Rule
Using a log rule, we match the small-end diameter with the log length to find the board-foot volume.Doyle Rule – Simple and familiar, but can understate small logs and overstate large logs.
International ¼” Rule – More precise, accounting for taper, often used for high-value veneer logs.
Account for Defects (If Needed)
Any deductions for rot, sweep, or other defects are made to get the net volume from the gross volume.Repeat for Every Log
We measure each log individually and total the board-foot volumes for the full load.
The Doyle Rule: Our Standard for Local Sales
The Doyle Rule is the most commonly used log scale in our region, and it’s what we rely on for nearly all of our log transactions.
Why We Use It:
Widely recognized and trusted by local mills
Best suited for larger-diameter hardwoods
Offers a consistent, conservative estimate of usable yield
Familiar to landowners, foresters, and buyers alike
Because most local mills buy based on the Doyle scale, we stick to it to keep things transparent and aligned with regional norms. That way, you always know what you're working with.
International ¼” Rule: For Export Veneer Logs
On the rare occasion that we scale a log using the International ¼” Rule, it’s specifically for export-grade veneer logsheaded to international buyers.
This rule:
Provides a more precise estimate by accounting for log taper and saw kerf
Tends to yield slightly higher board foot estimates, especially for smaller-diameter or high-quality logs
Is required or expected by certain specialty overseas markets
We reserve this method for top-tier logs where every board foot matters — and only when it's appropriate for the transaction.
Transparency Is Our Policy
No matter which rule we use, you’ll know upfront. We:
Stick to one scaling method per sale
Clearly label your scale ticket or invoice
Are happy to walk you through our process when we're measuring in the field
Whether you’re managing a long-term timber stand or clearing a few trees for space, our goal is to ensure you’re confident in the numbers.
