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Free wood-cutting planner: enter the largest log diameter you want to cut in one pass (inches) and optionally your engine’s rated displacement in cc. We apply a simple diameter + 2 in rule (snapped to common bars) and show a rough bar-length band for your power class—always confirm against your saw manual.
Last updated: April 8, 2026
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Optional. Largest single-cut round you plan to buck.
Optional. Nominal cylinder displacement from the manual.
From log (rule of thumb)
≥ 16 in
≈ 40.6 cm (snapped to common bar)
Typical range for your CC
16–18 in
Rough class band
Suggested single bar size (combined)
16 in
≈ 40.6 cm
Planning tool only—always follow your saw manufacturer’s maximum bar length, chain, and sprocket ratings for your exact model.
Single pass
Clearance
Coarse rule for planning—not a replacement for experience.
12–36 in
Next size up
Matches typical guide bar lengths on the shelf.
Rough class
Typical range
Wide variation by brand—use the manual for the final word.
Conflict
Warning
When log needs exceed typical CC bands.
Safety
Max bar
Never exceed manufacturer-approved bar and chain combos.
Stacking
Workflow
Bar size and cut length don’t replace cord volume planning.
14 in log, 50 cc engine
From log (≥)
16 in
CC band
16–18 in
We estimate a minimum bar length from log diameter using a diameter + 2 inch rule, then snap to the next common retail guide bar length. When you enter engine displacement, we also show a coarse bar-length band typical for that engine class. If you enter both, we combine the log and CC logic and warn when the suggested bar is outside the typical band for your power class.
minimum ≈ log diameter (in) + 2, then snap to common barCC bands are rough planning ranges—not model-specificStacking firewood? Try the firewood cord calculator and tent ground area.
Get a Custom Calculator for Your SiteEnter only log diameter to see the snapped minimum bar from the rule of thumb—useful when comparing bars before you know your next saw’s displacement.
Share it with your woodlot crew or arborist course
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