Workshop helpers
Woodworking calculators for the job in front of you
Practical answers for real workshop tasks, with the assumptions, kerf and geometry left visible so you can check the result before making a cut.
Choose a workshop task
Each calculator is deliberately focused. Enter the measurements you can verify, get the dimension you need, then use the diagram and worked explanation to confirm the setup on your own machine.
French cleat cut calculator
Find the table-saw fence setting for two matching cleats from one board, including the wider kerf made by a 45° blade.
Calculate the cutEqual spacing calculator
Space slats, hooks, holes or dowels across a span and get every centre position without chasing awkward fractions.
Space the itemsCabinet door size calculator
Size one door or a matching pair from the real opening, using your chosen inset gaps or overlay.
Size the doorsArc radius and layout calculator
Turn an arc's span and centre rise into a radius, trammel pivot position and arc length.
Lay out the arcPicture frame cut calculator
Calculate long and short mitre points, sight opening and outside size from the artwork and moulding.
Size the framePolygon frame calculator
Find mitres and rail lengths for a regular triangle, hexagon, octagon or other flat frame.
Size the railsPractical questions that keep coming up
These calculators cover focused workshop jobs where the maths is manageable but the right formula, measurement reference or saw convention is easy to forget.
They also answer recurring questions from woodworking communities: how long to cut frame rails, which way to adjust a sled fence, or what compound angles a tapered box needs. Each one stays focused on a specific task rather than becoming another general geometry app.
They are still numbers on a screen, not a safety check. Measure the real stock, follow your machine manufacturer's instructions and verify the setup with a test piece before cutting valuable material.