LayoutMath

Construction calculators for the whole job

Ten free construction calculators, grouped by the part of the job you are on: the deck and its stairs, the roof, the patio and drainage, and the layout in between. Each one shows its formula, a worked example you can load, and the code section it relies on.

Decks, stairs and railings

01

Deck material

Boards, joists, beams, posts and a cost you can edit.

Try it →02

Stair & stringer

Total rise in; risers, treads, stringers and an IRC check out.

Try it →03

Baluster

Count, equal gap and on-centre spacing, checked against the 4 in ball.

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Roofs and framing

04

Roof pitch

Rise and run in; x:12 pitch, degrees, slope and multiplier out.

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Roof area

Building size and pitch in; roof area, squares and bundles out.

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Rafter

Span and pitch in; rafter length, birdsmouth and hip length out.

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Patios and drainage

07

Paver

Pavers, base, sand and cost for patios, circles and fire pit rings.

Try it →08

French drain

Gravel, pipe, fabric, slope and a cost you can edit.

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Measuring and layout

09

Squaring

Two sides in; the diagonal that squares a layout out.

Try it →10

Feet & inches

Add, subtract, multiply and divide tape-measure lengths. Decimals and mm too.

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