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Reading the spec sheet
Fifteen construction calculators a working builder actually uses — on a phone, on a slab, with no signal. Concrete (slab / footing / column / pier), rebar, beam span, joist, wall framing, roof + shingles, insulation, rafter, IRC stairs, drywall, paint, deck materials, pressure loss, reference. Free on the App Store and Google Play.
Captured from production build · v1.5.3
Concrete — slab, footing, column, pier
The product solves something specific and gets out of your way.
One calculator, four pours. Slab volume + bag count, continuous + spread footings with rebar callouts, round/square columns, and round piers. Cubic yards or cubic meters. Bag count for 80 / 60 / 40 lb premix at typical manufacturer yields.
Slab grid (#3–#8 at 6"–24" OC), sticks needed with lap accounting, total linear feet and weight per ASTM A615 unit weights. Stop guessing how many bundles to load on the truck.
Wall length × stud spacing → stud + plate count, sheathing sheets (4×8 / 4×9 / 4×10 OSB or plywood), and header lookups. Subtract openings cleanly.
Plan area + pitch → actual roof area, ridge / hip / valley feet, and bundle count for 3-tab and architectural shingles plus underlayment + drip edge. Order in squares, not in surprises.
R-value × cavity → batts/rolls needed for walls, ceilings, floors, plus blown-in coverage in bags by R-value. R-13, R-19, R-21, R-30, R-38, R-49.
Pick a section and span, enter your line load (lb/ft). Live readout of predicted deflection against the L/360 service limit so you can catch under-spec headers before the framer does.
Span × spacing × overhang → joist count and total board feet. Works for floor, ceiling, deck. 12", 16", 19.2", 24" OC.
Roof pitch and run → rafter length, rise, plumb-cut angle, and bird's-mouth heel cut for a 3.5" seat. The math you used to do on a framing square, now in your pocket.
Total rise → riser/tread pair that meets IRC R311.7 (max 7.75" riser, min 10" tread). Stringer length and run angle. Headroom minimum is reminded — verify in the field.
Wall area minus openings → sheets (4×8, 4×10, 4×12), screws, mud, tape. Paint gallons + primer with coverage by paint type. Prevents the second trip to Home Depot.
Quick deck-materials estimator (joists, decking, fasteners). Plus Hazen-Williams pressure-loss for water lines (PEX, PVC, copper Type L, galvanized steel, cast iron).
Pick the fit. $3.99/mo to try, $28.99/yr for the best value (saves ~40% over monthly), or $64.99 once — pay once, every future Pro calculator included automatically. Original Pro buyers from earlier versions automatically own Lifetime. No ads, no accounts, no tracking. Less than what Construction Master Pro charges, and we still keep a Lifetime door open.
Everything you’d want to know about BuilderCalc on a single sheet. No marketing math.
Same DNA — offline, no ads, no accounts, no tracking. Pro Unlock optional, three tiers.
Want a walkthrough of BuilderCalc? We do live demos, off-the-record. No salesperson on the call — the people who built it.
