Construction calculators
Area, volume, materials, stairs, and bulk landscaping takeoffs.
Construction calculators on pancalc estimate materials, dimensions, loads, and electrical runs for DIY and professional planning. Each tool documents the formula and reminds you to confirm code requirements locally.
Use them to compare quotes, order supplies with a waste allowance, or teach how rise, run, span, and gauge interact. Outputs are mathematical estimates — field verification still matters before cutting or pouring.
When a contractor’s number differs from yours, compare which inputs they assumed for waste, packaging, and code minimums.
13 calculators
Beam Deflection & Bending Stress Calculator
Calculate center-load beam deflection and bending stress for a simply supported beam using span, material stiffness, and section properties.
Board and Batten Layout Calculator
Plan board-and-batten siding layout from wall width, batten size, and target spacing — get batten count, actual board width, and linear feet.
Concrete & Mortar Calculator
Estimate slab concrete volume in cubic yards, feet, or meters and calculate the approximate number of 80-pound premix bags to buy.
Cubic Feet Calculator
Calculate cubic feet, cubic yards, or cubic meters from three dimensions, or solve a missing length, width, height, or volume for project planning.
Drywall, Stud & Sheetrock Calculator
Estimate 4-by-8 drywall sheets and 16-inch-on-center wall studs from total wall length and height, then plan a practical waste allowance.
Heat Load (Simplified Manual J) Calculator
Estimate a preliminary heating or cooling load in BTU per hour from floor area and a selected BTU-per-square-foot planning factor.
Mulch, Soil & Gravel Calculator
Calculate mulch, topsoil, or gravel volume from coverage area and depth, with output in cubic yards, cubic feet, or cubic meters for ordering.
Retaining Wall Stability Estimator
Estimate Rankine active earth pressure and resultant force on a vertical retaining wall with level, dry, cohesionless backfill. Free browser tool.
Roofing Shingle & Pitch Calculator
Calculate pitched roof surface area and roofing squares from horizontal footprint area and rise-over-12 pitch for a fast material estimate.
Square Footage Calculator
Calculate rectangular floor, wall, roof, or landscape area from length and width, with fast conversion between square feet, yards, and meters.
Stair Calculator
Calculate stair riser count, riser height, tread depth, and stringer angle from total rise and horizontal run for early layout planning.
Voltage Drop & Wire Size Calculator
Estimate copper conductor voltage drop or required circular-mil area from current, one-way length, and an allowable voltage-drop target.
Water-Cement Ratio & Strength Estimator
Calculate water-cement ratio from mix masses and estimate an illustrative 28-day compressive strength using a simplified Abrams-style relationship.