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Lumber Yield Calculator

Lumber Yield (Rough → Finished)

Rough Board

Thickness (in) Width (in)

Length (ft)

+ Length (in)

Allowances

Planing per face (in)

Saw kerf (in)

Edge trim each side (in)

End trim each end (in)

Finished Part

Thickness (in) Width (in) Length (in)

Rough Stock Needed (for Parts)

Finished Part

Thickness (in) Width (in) Length (in) Quantity needed

Planning

Waste / Offcuts (%)

Assumed Rough Board

Thickness (in) Width (in)

Length (ft)

+ Length (in)

Assumptions & Method

Board feet formula: Thickness(in) × Width(in) × Length(in) ÷ 144
Thickness yield requires rough ≥ finished + 2× planing allowance
Width and length yields account for kerf between cuts and trimming allowances

© 2025 - 2026 Peter Martin
Released under the MIT License

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Comment if you find the results inaccurate or have suggestions. Thanks.

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