Woodworking calculators
Calculate board feet, size joints, pick drill bits, and plan glue-ups, all in the fractional inches woodworkers rely on.
Popular woodworking calculators
Core tools for the shop, from lumber purchasing to final joinery.
Board Feet Calculator
Calculate lumber board feet from thickness, width, and length in inches.
Drill Bit Size Calculator
Match drill bit fractions to screw gauges and pilot holes.
Shelf Sag Calculator
Max span before deflection by material and thickness.
Pocket Hole Depth
Kreg jig depth and screw length from workpiece thickness.
Lumber & materials
Joinery & layout
Dado Width Calculator
Calculate dado and rabbet widths for router bits
Mortise & Tenon Calculator
Calculate mortise and tenon joint dimensions in inches
Dovetail Angle Calculator
Calculate dovetail joint angles and pin sizes in inches
Wood Glue Clamp Spacing
Calculate optimal clamp spacing for glue-ups in inches
Fasteners & tools
Quick reference: board feet formula
Board feet formula
BF = (T × W × L) ÷ 144
T = thickness (in), W = width (in), L = length (in)
| Nominal | BF per lin. ft |
|---|---|
| 1×4 | 0.33 |
| 1×6 | 0.50 |
| 1×8 | 0.67 |
| 2×4 | 0.67 |
| 2×6 | 1.00 |
Drill bit fractions
| Fraction | Decimal (in) |
|---|---|
| 1/16" | 0.0625 |
| 1/8" | 0.125 |
| 3/16" | 0.1875 |
| 1/4" | 0.250 |
| 5/16" | 0.3125 |
Explore more categories
Construction for framing, fractions for precise inch measurements.