Tools
Fast, source-cited tools for the dimensions and code numbers you reach for on the job. Search, or browse by task.
Dimensions & scale
Stairs, ramps & clearances
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ADA Ramp Slope Calculator
Ramp length, landings, and 1:12 compliance — cited to 2010 ADA §405.
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ADA Clearances & Dimensions
Turning space, doors, toilets, counters, reach ranges & more — diagrams cited to the 2010 ADA Standards.
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Stair Calculator
Risers, riser height, tread run, and pitch from a rise — cited to IRC R311.7.
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Stair Stringer Calculator
Stringer length, plumb/level cut angles, and the framing-square rise & run — plus the cut-stringer throat check.
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Guardrail & Baluster Calculator
Even baluster spacing under the 4″ sphere rule, plus cited guard heights — IRC (residential) & IBC (commercial).
Framing & roofs
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Stud Spacing Reference
Stud-count takeoff and on-center layout for a wall (16"/24" o.c.).
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Roof Pitch Converter
Convert roof slope between rise-in-12 (6:12), degrees, and percent grade.
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Rafter Length Calculator
Common-rafter run, rise, line length, plumb/seat cut angles, and per-foot factors from a span and pitch.
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Roofing Calculator
Roof area, squares, and shingle bundles from a building footprint and roof pitch.
Areas & materials
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Drywall & Paint Takeoff
Estimate drywall sheets and paint gallons for a wall or ceiling area.
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Square Footage Calculator
Area in sq ft, sq yd, m² and acres from length × width — with an optional material-cost estimate.
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Tile & Flooring Calculator
Tiles and boxes to cover a floor or wall area, with a waste allowance.
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Concrete Takeoff
Cubic yards, cubic metres, and bag counts for slabs, footings, walls, columns, and round piers — with a waste allowance.