Wood & Woodworking calculators
Calculators for sawyers, woodworkers, and firewood cutters: lumber volume, log scaling, firewood heat, seasonal wood movement, and CNC feeds. Species data comes from the USDA Wood Handbook.
- Board Foot CalculatorBoard feet = thickness (in) × width (in) × length (ft) ÷ 12, multiplied by the number of pieces.Inputs: Thickness, Width, Length
- CNC Feeds and Speeds CalculatorFeed rate = spindle RPM × number of flutes × chip load per tooth, and surface speed = π × tool diameter × RPM.Inputs: Tool diameter, Number of flutes, Spindle speed
- Compound Miter Angle CalculatorFor n sides leaning a degrees from vertical, set the blade bevel to arcsin(cos a × sin(180° ÷ n)) and the miter to arctan(sin a × tan(180° ÷ n)).Inputs: Number of sides, Wall lean from vertical
- Epoxy Pour Volume CalculatorEpoxy volume is length × width × depth in cubic inches divided by 1.8047 to get fluid ounces; split it by your mix ratio and add extra for waste.Inputs: Length of the pour, Width of the pour, Depth of the pour
- Equilibrium Moisture Content CalculatorWood settles at a moisture content set by the air around it: about 9% at 70°F and 50% relative humidity, and about 12% at 65% humidity.Inputs: Air temperature, Relative humidity, dry season, Relative humidity, humid season
- Firewood BTU Calculator by SpeciesA cord of seasoned white oak holds roughly 28 million BTU of usable heat, about 70% more than a cord of quaking aspen; species and moisture drive the difference.Inputs: Species, Moisture content, Cords of wood
- Firewood Cord and Face Cord CalculatorA full cord is 128 cubic feet of tightly stacked wood (4 ft × 4 ft × 8 ft); a face cord is one 4 ft × 8 ft face at whatever log length you cut.Inputs: Stack length, Stack height, Log length
- Log Scale CalculatorEnter the small-end diameter inside bark and the log length to compare Doyle and International 1/4-inch board-foot estimates.Inputs: Small-end diameter, Log length, Number of logs
- Lumber Weight Calculator by SpeciesLumber weight is its volume times density; kiln-dried white oak at 12% moisture weighs about 46 lb per cubic foot, or roughly 3.9 lb per board foot.Inputs: Species, Moisture content, Thickness
- Segmented Bowl Ring CalculatorEach segment end is cut at 180° ÷ n, and the outside length of a segment is the ring diameter times tan(180° ÷ n) across the flats or sin(180° ÷ n) across the corners.Inputs: Segments in the ring, Ring outside diameter, Diameter is measured
- Shelf Sag CalculatorA shelf on two supports sags 5wL⁴ ÷ (384EI) at its middle, so doubling the span makes it sag 16 times as much, while doubling the thickness cuts it to one-eighth.Inputs: Span between supports, Shelf depth, Shelf thickness
- V-Bit Depth CalculatorFor a V-bit with a sharp tip, depth = (line width ÷ 2) ÷ tan(half the included angle); a 60° bit cuts a 0.5 in line at 0.433 in deep.Inputs: Find, Included angle of the bit, Flat tip width
- Wood Moisture Content and Drying Weight CalculatorWood moisture content (dry basis) is (wet weight − oven-dry weight) ÷ oven-dry weight × 100; weight at a target moisture is oven-dry weight × (1 + target ÷ 100).Inputs: I know, Current weight, Current moisture content
- Wood Movement CalculatorA 12-inch flatsawn white oak board changes about 0.17 inch in width for every 4 percentage points of moisture change.Inputs: Species, Grain, Board width