BuilderCalc: Construction Calc
iOS Universel / Utilitaires
BuilderCalc is the no-nonsense construction calculator for your phone — built on the job site, for the job site.
Stop juggling a soggy notepad, three sticky-note conversion factors, and a calculator that drops the trailing zero. BuilderCalc opens in a second, works completely offline, and gives you concrete yardage, beam deflection, joist spacing, and material counts before the truck even backs up.
■ CONCRETE VOLUME
• Slabs, footings, columns, and pier holes
• Cubic yards AND cubic feet, side by side
• Bag counts for both 60 lb and 80 lb mixes
• 10% waste factor built in (toggle on/off)
• Imperial and Metric (toggle anywhere, instantly)
■ BEAM SPAN
• Solid sawn 2×6, 2×8, 2×10, and 2×12
• Section properties (b·h³/12) computed from ACTUAL dressed dimensions, not nominal
• Deflection at L/360 (live load) and L/240 (combined)
• Allowable bending stress and shear checks
• Clear "verify with engineer" warnings when inputs are out of range
■ JOIST SPACING
• Recommended on-center spacing for floor and deck joists
• Live-load + dead-load aware (psf inputs, with sensible presets)
• Species and depth dropdowns
• Computes max safe spacing per the L/360 deflection limit
• Cross-references the Beam Span panel automatically
■ MATERIALS ESTIMATOR
• Boards, joists, fasteners, and concrete totals for any deck, floor, or stud wall
• Closing-joist math is included so you don't come up one short on the truck
• Linear feet, board count, and rough cost-of-materials placeholder
• Output is a clean copy-paste list you can text the lumberyard
■ PRESSURE LOSS
• Water flow through copper, PEX, and PVC pipe runs
• Hazen-Williams equation (the right one for water in pipes)
• Useful for irrigation laterals, hose bibs, and mechanical-room rough-ins
• Output in PSI and kPa
• WHAT MAKES BUILDERCALC DIFFERENT •
• 100% OFFLINE. No signal, no Wi-Fi, no problem. Never makes a network request.
• NO ACCOUNTS. NO ADS. NO TRACKING. Privacy label: Data Not Collected.
• Tables sourced from published references — NDS section properties, Hazen-Williams coefficients, common fastener data sheets.
• Built by trades and engineers.
• FREE FOREVER •
Concrete Volume (slab + footing + column + pier), Beam Span, Joist Spacing, Wall Framing, Roof + Shingles, Insulation, Materials Estimator, Pressure Loss, Reference.
• PRO UNLOCK — THREE WAYS •
The free calculator stays free forever. Pro Unlock now comes three ways so you can pick the fit:
• Monthly subscription — try Pro for a month, cancel anytime in your Apple ID Subscription Settings
• Yearly subscription — best value, around 40% less than monthly billed across the year
• Lifetime — pay once, every future Pro feature included automatically, no recurring charge
Pro adds:
• Rebar — slab grids, sticks, weight per ASTM A615, lap accounting
• Footing schedules with rebar callouts (continuous + spread + pier)
• Pier / Column volume (round and square)
• Rafter — pitch, length, plumb-cut, bird's-mouth heel cut
• Stairs — IRC R311.7 rise/run + stringer length
• Drywall — sheets, screws, mud, tape estimator
• Paint — gallons + primer with coverage by paint type
• Family Sharing on Lifetime — covers your whole Apple Family
• All future Pro features included automatically
Subscriptions auto-renew until cancelled. Manage or cancel any time in your Apple ID Subscription Settings.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://doublevision.company/privacy
• BUILT BY DOUBLE VISION •
Built by a working trades team and a working software engineer.
Bugs, feature requests: support@doublevision.company
Measure twice, swing once.
DISCLAIMER
Calculation aid only — not a substitute for structural drawings, building codes, or engineering judgment. Verify critical loads with a code official or licensed engineer.