BuildSmith puts the numbers you need on a job site in one offline toolbox. Thirty-seven calculators across eleven trades, ten quick-reference sheets, and converters built for the way tradespeople actually measure — feet, inches and fractions.
No login. No setup. Every calculator works with the phone in airplane mode.
TRADE CALCULATORS
• Carpentry & framing — wall stud count, board feet, deck boards, trim and molding, common rafter length, stair rise/run and stringer layout
• Concrete & masonry — slab volume, footings and trenches, columns and sonotubes, CMU block walls, brick walls, rebar grids
• Electrical — Ohm's law and Watt's law, voltage drop, resistor and load networks, EMT conduit fill, box fill
• Low voltage — DC voltage drop, battery backup runtime, parallel speaker loads
• Drywall — sheets, mud, tape and fasteners
• Paint — gallons for walls and ceilings with coats and waste
• Flooring — boxes needed, tile counts, underlayment
• Ceilings — lay-in tile counts and suspended grid layout
• Roofing — roof area, squares, shingle bundles
• Site & layout — 3-4-5 squaring, right triangles, slope and grade, area and volume
• Converters — unit converter and inch/decimal/fraction conversion
REFERENCE SHEETS
Copper wire ampacity, lumber sizes, nail and screw gauges, concrete bag yields, roof pitch and slope factors, fraction/decimal/millimetre equivalents, drill and tap sizes, and more — the tables you would otherwise be searching for with dirty hands.
BUILT FOR THE FIELD
• Works completely offline — no signal needed in a basement or on a new pour
• Results update as you type, with the working shown
• Feet-and-inches and fractional input, not just decimals
• Star your most-used tools so they sit at the top of the home screen
• Save any calculation and pull it back up later
• Share a result as text — send the takeoff straight to your foreman or supplier
• Dark, high-contrast interface that stays readable in a truck or a lit-up attic
• No account, no cloud, no data leaving your phone
BUILDSMITH PRO
BuildSmith is free and fully usable. Pro is a single one-time purchase — never a subscription — and it unlocks:
• No banner or full-screen ads, anywhere in the app
• Every Pro reference sheet
• Unlimited saved-calculation history
Prefer not to pay? You can watch a short video to unlock everything for 24 hours whenever you need it.
WHO IT IS FOR
Carpenters, framers, concrete finishers, masons, electricians, low-voltage and fire-alarm technicians, drywall hangers, painters, flooring and ceiling installers, roofers, remodelers, general contractors, estimators, building inspectors, apprentices studying for a licence, and anyone who has ever done math on the back of a stud.
A NOTE ON ACCURACY
BuildSmith gives estimates and reference information for planning. Always verify quantities and code requirements against the governing code, engineered plans and manufacturer data for your specific job.
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