How We Scale Logs: Understanding the Doyle and International ¼” Rules
If you’ve ever wondered how we determine how many board feet are in a log, you’re not alone. Log scaling is both an art and a science — and knowing the method used helps you understand what you're getting when selling or buying logs. At Grabeldinger Firewood, we primarily use the Doyle Rule, the standard for most local mills. We only use the International ¼” Rule for high-value veneer logs sold to international buyers.
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.
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.
