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Measure twice.
Calculate once.
Free, practical calculators for planning carpentry work before you order material or mark the first cut. Built around the measurements that matter on a real job.
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Imperial · Metric · PrintableStair & Stringer Calculator
Calculate equal risers, tread count, first-rise correction, total run, stair angle, stringer length, throat and stock sizing.
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Boards · Joists · FastenersDeck Material Calculator
Estimate deck-board courses, stock-board quantity, lineal footage, joist lines and fasteners with a configurable waste allowance.
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Equal gaps · Layout marksBaluster Spacing Calculator
Find an equal clear gap, exact baluster count, on-centre spacing and repeatable layout marks between two posts.
Open calculatorBuilt for planning
Useful numbers without pretending the site can see the job.
Every calculator shows its assumptions and limits. Verify field dimensions, material specifications, structural requirements and the building rules that apply to your project.