Log Scaling (Board Foot Estimates)

When you’ve got a log on the ground, the big question is: “How much usable lumber is in here?”
Log scaling is the process of estimating a log’s potential yield in board feet before it’s milled. It’s a helpful planning tool for everything from backyard storm trees to jobsite material planning.

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What is a board foot?

A board foot is a volume measurement equal to:

$1\mathrm{“}\text{ thick}\times 12\mathrm{“}\text{ wide}\times 12\mathrm{“}\text{ long}$1″ thick×12″ wide×12″ long

That’s the standard unit used to estimate lumber volume and compare logs.

Why log scaling is an estimate (not a guarantee)

Scaling gives a solid starting point, but real yield depends on the actual log and how it’s sawn. Things that can change the final output include:

• Taper (logs get smaller toward the top)
• Sweep/crook (curves)
• Knots, rot, cracks, and other defects
• Embedded metal (nails, fence wire, etc.)
• Sawing strategy (maximizing figure/grade vs. maximizing volume)
• Target thickness and intended use

We’ll always talk through your goals so the cut plan matches what you’re trying to build.

Common log scales (Doyle, Scribner, International 1/4″)

Different log rules use different assumptions about waste and saw kerf, so the same log can show different board-foot totals depending on the scale you choose. None of them are “wrong”—they’re just different estimating methods.

Doyle Scale

A very common rule in many regions. Doyle often reads lower on smaller-diameter logs, and can be more favorable as log diameter increases. If you’re scaling smaller logs, don’t be surprised if Doyle feels conservative.

Scribner Scale

Scribner is another widely used rule based on diagramming how boards might be laid out in a log. It’s often seen in traditional lumber markets and can land between Doyle and International, depending on log size and assumptions.

International 1/4″ Scale

International 1/4″ is designed to be a more consistent estimate across a wider range of log sizes, accounting for kerf and waste in a more standardized way. Many people consider it a strong “all-around” estimating scale.

Which scale should you use?

• If you’re comparing logs with local buyers/sawmills, use the scale they reference most often.
• If you want a consistent planning estimate across sizes, International 1/4″ is a great default.
• If you’re unsure, send us your log details (species, diameter, length, and a couple photos) and we’ll help you pick the best scale for your situation.

Next step

For milling and drying costs, head over to our Pricing page. If you’d like a more exact quote, reach out with your log info and what you’re hoping to build — we’ll help you turn that tree into something worth keeping.

If you want, I can also write a short “How to measure your log” section (diameter at small end, inside bark, standard lengths, and a quick photo checklist) to reduce back-and-forth on quotes.