Woodworking Calculators
Precision is everything in woodworking. Our calculators help you get the math right before you make a cut. Calculate miter angles for frames and polygon shapes, lay out dovetail joints with even spacing, estimate wood shrinkage across seasons, figure out how many plywood sheets you need, estimate lumber quantities, and convert board foot measurements for purchasing hardwood. These tools save time, reduce waste, and help you build with confidence.
Miter Angle Calculator
Calculate miter and bevel angles for frames and polygon shapes.
Dovetail Calculator
Compute dovetail joint spacing, pin and tail layout dimensions.
Wood Shrinkage Calculator
Estimate dimensional change from moisture content variation.
Plywood Calculator
Calculate how many plywood sheets you need for your project.
Lumber Calculator
Estimate lumber quantities and costs for building projects.
Board Foot Calculator
Convert lumber dimensions to board feet for pricing hardwood.
Frequently Asked Questions
How do I calculate miter angles for polygon shapes?
For a regular polygon with N sides, each miter angle is 180/N degrees. For example, a hexagon (6 sides) needs 30-degree miter cuts, and an octagon (8 sides) needs 22.5-degree cuts. Our miter angle calculator handles regular polygons and also lets you enter custom angles for non-standard joints.
What is a board foot and how is it calculated?
A board foot is a unit of lumber volume equal to 144 cubic inches — equivalent to a board 1 inch thick, 12 inches wide, and 12 inches long. The formula is: (thickness in inches x width in inches x length in feet) / 12. Hardwood lumber is typically sold by the board foot, so this calculation is essential for estimating costs.
How does wood shrinkage affect my projects?
Wood shrinks and expands as its moisture content changes. Shrinkage varies by species and grain direction — tangential shrinkage (across the rings) is typically twice radial shrinkage. Our wood shrinkage calculator estimates dimensional change based on species, initial and final moisture content, and grain orientation, helping you plan for seasonal movement.
How do I calculate dovetail joint spacing?
Dovetail spacing depends on the board width, number of tails, and the desired tail-to-pin ratio. Traditional hand-cut dovetails often use a 1:6 to 1:8 angle ratio. Our dovetail calculator computes even spacing for your board width and preferred number of tails, giving you precise layout measurements for clean, tight-fitting joints.