Carpentry calculators, drawn to scale

Stairs, roofs, decks, fences and lumber — type your measurements, see the numbers and a drawing. Free, no sign-up.

Stairs & decks

Stair CalculatorRisers, treads and stringer length from the total rise, with a layout.Deck CalculatorDeck boards, joists, posts and screws for your deck size.Fence CalculatorPosts, rails, pickets and bags of concrete.Baluster Spacing CalculatorEven baluster spacing under the 4" rule, with marks.

Roofs

Roof Pitch CalculatorPitch, angle, slope % and rafter factor from rise and run.Rafter CalculatorRafter length, cut angles and count for a gable roof.

Lumber & framing

Board Foot CalculatorBoard feet and cost of a lumber list, or board feet in a log.Plywood CalculatorSheets of plywood or OSB for floors, walls and roofs.Stud CalculatorStuds and plates for a wall, with corners and openings.

Guides and charts