Construction Expert A1 PRO

Replace your $100+ hardware calculator with a smarter one. Construction Expert A1 Pro puts 150+ professional construction calculators in your pocket — feet-inch-fraction math, roofing, rafters, stairs, framing, concrete, material take-offs and more. Works fully offline.

Built for general contractors, framers, carpenters, builders, estimators, electricians, plumbers, HVAC pros and serious DIY builders.

WHY CONTRACTORS SWITCH
- Enter 12' 7-3/16" the way you read it on the tape — no decimal conversion
- Live drawings highlight each dimension as you enter it, so you know what every number means
- One consistent keypad across every calculator, with a Next key that guides you through each form
- Save calculations by project, attach photos, export branded PDF reports for your bid
- No signal needed — works on the roof, in the basement or at the back of the lot

PROFESSIONAL CONSTRUCTION CALCULATOR
- Full feet, inches & fraction math, 1/16 to 1/64 with automatic simplification
- Feet, inches, yards, meters, centimeters & millimeters
- Percentage, square, cube, square root & reciprocal
- Degrees-minutes-seconds and trigonometry (sin, cos, tan)
- Expression mode with 12 construction formula templates
- Running tape with save, share & print
- 3 memory registers plus cumulative memory with count & average

ROOFING & RAFTER CALCULATORS
- Pitch, rise, run & diagonal — solve right triangles instantly
- Common rafter length with plumb and level cut angles
- Hip, valley & jack rafters with cheek cuts and on-center increments
- Irregular and dual-pitch roofs
- Rake wall stud lengths, ascending or descending
- Roof area, squares, bundles & 4x8 sheet count
- Interactive rafter diagrams

STAIR & STRINGER CALCULATOR
- Total rise to risers, treads & total run
- Riser adjustment
- Stringer length and angle, open or closed stringers
- Interactive stair diagram with labeled dimensions

TRADE CALCULATORS
- Electrical: wire sizing (NEC), voltage drop, conduit fill, box fill & service sizing
- Plumbing: pipe sizing, DFU, water heater, fitting offsets & drain slope
- HVAC: BTU load, duct sizing, CFM & refrigerant charge
- Landscaping: mulch, gravel, sod, irrigation, retaining walls & pavers

MATERIAL ESTIMATION & TAKE-OFFS
- Concrete volume for slabs, footings & columns, plus bag counts and rebar
- Board feet, stud spacing & stud counts
- Roofing squares, bundles, felt & ridge vent
- Drywall, siding, flooring & insulation
- Fence, deck, baluster & spindle spacing

57+ AREA & VOLUME SHAPES
- Rectangles to L-shaped rooms, gable walls, pipes & toruses
- Concrete steps, retaining walls & trenches
- Perimeter, area, surface area & volume with labeled interactive diagrams

50+ CONSTRUCTION UNIT CONVERTERS
- Length, area, volume, weight, temperature & pressure
- Concrete bags, rebar, CMU blocks, board feet & aggregates
- Lumber, drywall, roofing, siding, flooring & insulation
- Wire gauge, conduit & breakers; PVC, copper & PEX pipe; HVAC tonnage

PROJECTS, NOTES & EXPORT
- Organize calculations by project and folder, with rich-text notes and photos
- Favorites and searchable history
- Professional PDF reports with your company branding
- 7 PDF generators: rafters, stairs, fences, balusters, miters, materials & estimates
- CSV, PNG & plain-text export

MADE TO FIT YOUR WORK
- Imperial or metric default units; fraction resolution from 1/2 to 1/64
- Dark, light or system theme; home screen widgets; haptic feedback
- English, Spanish, French, German & Arabic

PRICING
Choose a monthly or yearly subscription, or a one-time Lifetime purchase with no recurring charges.

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