Woodworking calculators — shop maths for every project

Add or subtract two measurements written the way a tape shows them, read to the nearest sixteenth, thirty-second or sixty-fourth.

A pocket construction calculator on screen: feet, inches and fractions on a keypad, square and cubic footage, metric, and pitch, rise, run and diagonal from any two.

How many pieces of one length come out of a board of another, with the kerf charged between cuts and the leftover shown.

How many same-size panels fit on a sheet of plywood in a plain grid, turned 90° if that fits more.

The right drill bit for a wood screw, by gauge number and by softwood or hardwood.

Screw length and thread by material thickness, and how far apart to space the holes along an edge joint.

How many boards it takes to glue up a target panel width, and how much wider to glue up so the rip lands clean.

Linear footage of flat trim for a room from its perimeter and its doorways, with a waste allowance.

The miter for baseboard, casing or chair rail at any corner angle — flat trim, so there's no bevel to set.

A trammel arm's length for a full circle, or the radius of a shallow arc from its chord and rise.

Where the two nails go and how long the string is for the string-and-pencil method, or a table of offsets to plot the curve with a tape.

Scale a small pattern up to full size using the classic square-by-square grid method.