How This Tool Works
The Lumber Grade Estimator gives a planning-grade NHLA-style estimate from the board information shown in the calculator. Enter the board length in feet, board width in inches, the number of knots, and the severity of wane, warp, and splits or checks.
The calculator estimates clear-face percentage from the entered dimensions and knot count, applies defect penalties for each severity setting, then maps the result to a hardwood grade such as FAS, Select, #1 Common, #2 Common, or #3 Common.
- Inputs: Board length, board width, knot count, wane, warp, and splits/checks.
- Output: Estimated grade, clear-face percentage, and minimum clear-face requirement.
- Use: Quick screening before purchase, sorting, or shop planning.