Wood Calc: Shop Calculator

Wood Calc puts woodworking math in your pocket. No laptop in the shop, no sawdust on your keyboard. Pull out your phone and get the answer.

10 calculators covering shelf design, lumber math, lathe turning, segmented bowls, cut list optimization, and wood moisture and movement. All in one app, built for the workbench.

SHELF SAG CALCULATOR
Will your shelf hold up? Enter dimensions, pick a material, set your load, and see deflection before you build.

• 28 materials, hardwoods, softwoods, and sheet goods
• Fixed and cantilever support types
• Edge banding for composite shelves
• Visual sag diagram
• Quick presets for common builds

BOARD FEET CALCULATOR
Tally up lumber for your project. Enter dimensions and quantity, keep a running total as you add pieces.

• Automatic quarter thickness rounding
• Running total across entries

CUT LIST OPTIMIZER
Plan your parts, optimize cuts from stock, and export a PDF cut sheet.

• 1D boards and 2D sheet goods
• Accounts for kerf width
• Optional part rotation for sheets
• Visual layout diagrams with waste percentage
• Export and share PDF cut sheets

LATHE SPEED CALCULATOR
Enter your workpiece diameter, get safe RPM instantly.

• Roughing and finishing speeds
• Warns when speed exceeds typical lathe limits

SEGMENTED BOWL CALCULATOR
Enter segment count and dimensions to get precise miter angles and cut sizes for ring-based bowls.

SPHERE TURNING CALCULATOR
Octagon layout marks, tenon sizing, and blank dimensions for turning spheres.

BOWL BLANK SIZING
Size your blank from a log, flat rim or natural edge. Includes green wood allowance for rough turning.

MOISTURE (EMC) CALCULATOR
Equilibrium moisture content from temperature and relative humidity.

WOOD MOVEMENT CALCULATOR
Predict seasonal expansion and contraction. 14 species, flat sawn and quarter sawn.

WOOD CALC PRO
Unlock the multi-ring segmented bowl designer and unlimited cut list parts. Design full bowls ring by ring with custom diameters, wall thickness, wood colors, profile preview, and a detailed cut list. Plan cuts with more than 5 parts in the Cut List Optimizer.

WORKS YOUR WAY
• Imperial and metric units
• iPhone and iPad
• No account required
• No ads
• No internet connection needed