Woodworking Calculators
Board Foot Calculator
Calculate board feet per board and total board feet for an order from thickness, width, length, and quantity.
Lumber Cost Calculator
Calculate total lumber cost from known board feet, or from raw thickness, width, length, and quantity dimensions.
Miter Angle Calculator
Calculate the miter saw angle setting and full corner angle for any regular polygon frame from its number of sides.
Plywood Sheet Calculator
Calculate how many standard 4x8 or 1.22x2.44m plywood sheets a project needs from its area and a waste allowance.
Sanding Grit Progression Calculator
Get the recommended step-by-step sandpaper grit progression between a starting and ending grit for smooth results.
Table Leg Angle Calculator
Calculate the splay angle and actual slanted leg length for angled table or chair legs from offset and leg length.
Wood Cutting Calculator
Calculate how many pieces a board yields at a target cut length, accounting for saw blade kerf width and leftover material.
Wood Joint Strength Calculator
Compare relative strength estimates for wood joint types like mortise and tenon, dovetail, and biscuit across different wood species.
Wood Moisture Content Calculator
Calculate wood moisture content percentage from a sample's wet weight and oven-dry weight using the standard formula.
Wood Shrinkage Calculator
Calculate dimensional shrinkage and final size for common wood species using published tangential and radial shrinkage percentages.
The Math Behind an Accurate Cut List
Woodworking projects live or die on getting quantities and angles right before the saw ever starts — board footage determines how much lumber to actually buy, miter angles need to be precise for joints to close cleanly, and wood movement from humidity changes can warp a project built without accounting for it. Ten calculators here cover the shop math that turns a project plan into an accurate material order and cut list.
Popular Woodworking Calculators
Ten tools span material estimation, joinery, and wood movement:
- Board Foot Calculator — calculates board footage from lumber dimensions, the standard unit hardwood is priced by.
- Lumber Cost Calculator — estimates total material cost from board footage and price per board foot.
- Miter Angle Calculator — calculates correct miter and bevel angles for multi-sided frames and boxes.
- Wood Moisture Content Calculator — estimates moisture content to check whether lumber is dry enough to use safely.
- Wood Shrinkage Calculator — estimates dimensional change as wood dries or adjusts to seasonal humidity.
Why Wood Keeps Moving Long After It's "Dry"
Wood is hygroscopic, meaning it continually absorbs and releases moisture in response to ambient humidity even after initial kiln or air drying, and it shrinks and swells mostly across its width (tangential and radial directions) rather than along its length. This is exactly why woodworkers account for wood movement in joinery design — a panel glued rigidly on all four sides with no room to expand and contract seasonally can crack or the joint can fail entirely once humidity shifts between summer and winter, which is a common and avoidable failure mode addressed by movement allowance in good furniture design.
Frequently Asked Questions
Why is lumber priced by board foot instead of just length?
Board foot accounts for thickness and width in addition to length, which matters because hardwood boards vary in thickness and width even within the same order, unlike dimensional softwood lumber sold in standardized sizes.
Does a compound miter need two separate angle calculations?
Yes — a compound miter cut combines both a miter angle (rotation) and a bevel angle (tilt), and getting a clean joint on angled projects like picture frames or crown molding requires calculating both correctly together, not just one.
Explore More
Working with metal instead of wood? See the Metalworking Calculators, or check broader construction material takeoffs in the Construction Calculators.