Construction calculators
that match the jobsite
Free tools for rebar, stairs, drywall, concrete, square footage and 12 more construction tasks. Full formulas published, ACI 318 + IRC 2024 sourced, worked examples included.
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ACI 318 + IRC 2024 sourced
16Construction Tools
5Reference Guides
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Top Construction Calculators
View all 16 →Rebar Calculator
Bar count, linear footage and weight for concrete slabs, footings and walls.
Stair Calculator
Rise, run, stringer length and IRC R311 code check for any staircase.
Drywall Calculator
Sheet count for walls and ceiling — plus mud, tape and screw quantities.
Concrete Calculator
Cubic yards, cubic feet and bag counts (60-lb, 80-lb) for any pour.
Square Footage
Area for rectangle, circle, triangle and L-shape with unit conversion.
Roofing Calculator
Shingles, squares and material cost estimate by roof dimensions.
Construction Guides & References
Methodology & sources →Rebar Spacing Guide
When to use 12 vs 18 inch on center, with chart by project type.
Stair Rise & Run Guide
IRC R311 code, ideal riser height and layouts for 8/9/10 ft ceilings.
How Much Drywall Do I Need?
Sheet count lookup by room size for 4×8 and 4×12 panels.
Material Conversion Chart
Cubic yards to bags, rebar weight, lumber nominal/actual, more.
Calculation Methodology
Every formula and source. ACI 318, IRC 2024, ASTM A615 cited.