Construction Expert A1 PRO

Expert dimensional math for rafters, stairs, and materials. Instantly estimate concrete, drywall, and studs—built for professionals on site.

The ultimate construction calculator trusted by contractors, builders, carpenters, and engineers. Construction Expert A1 Pro replaces your $100+ hardware calculator with a smarter, more powerful app.

PROFESSIONAL CALCULATOR

• Full feet-inch-fraction math — enter dimensions the way you think
• Supports feet, inches, yards, meters, centimeters, millimeters
• Fractional entry (1/16 to 1/64 resolution) with auto-simplification
• Percentage, square, cube, square root, reciprocal
• D:M:S (degrees-minutes-seconds) and trigonometry (sin, cos, tan)
• Expression mode with 12 construction formula templates
• Running tape with save, share, and print
• 3 memory registers + cumulative memory with count/average

RIGHT ANGLE & ROOF FRAMING

• Pitch, rise, run, diagonal — solve any right triangle instantly
• Common rafter length, plumb cut, and level cut angles
• Hip/valley rafter with cheek cut angles
• Jack rafter lengths with on-center increment
• Irregular roof support (dual-pitch hip/valley)
• Rake wall stud lengths (ascending or descending)
• Roof area, squares, bundles, and 4x8 sheet count
• Interactive rafter diagrams

STAIR LAYOUT

• Total rise to finished risers and treads
• Riser adjustment (+/-) for code compliance
• Stringer length and inclination angle
• Open/closed stringer support
• Interactive stair diagram with all dimensions

7 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 wall, pavers

57 AREA & VOLUME SHAPES

• Simple squares to L-shaped rooms, gable walls, pipe volumes, toruses
• Interactive diagrams with labeled dimensions
• Perimeter, surface area, and volume calculations
• Construction shapes: concrete steps, retaining walls, trenches

50+ UNIT CONVERTERS

• Length, area, volume, weight, temperature, pressure
• Concrete bags, rebar, CMU blocks, board feet
• Lumber, drywall, roofing, siding, flooring, insulation
• Electrical wire gauge, conduit, circuit breakers
• Plumbing pipes (PVC, copper, PEX), HVAC tonnage
• Aggregates, fasteners, and more

MATERIAL ESTIMATION

• Board feet, stud spacing and count
• Concrete volume (slabs, footings, columns)
• Roofing (squares, bundles, felt, ridge vent)
• Drywall, baluster/spindle spacing, fence materials

PROJECT MANAGEMENT

• Organize calculations by project
• Rich text notes with folder organization
• Photo attachments for calculations
• Star/favorite frequently used calculators
• Calculation history with search and filter

EXPORT & SHARE

• Professional PDF reports with company branding
• CSV spreadsheet, PNG image, and plain text export
• 7 PDF generators (rafter, stair, fence, baluster, miter, materials, estimate)

CUSTOMIZATION

• Dark mode / Light mode / System theme
• 5 languages: English, Spanish, French, German, Arabic
• Fractional resolution (1/2 to 1/64)
• Imperial or Metric default units
• Home screen widgets, haptic feedback, and sound effects
• Company branding for all PDF exports

BUILT FOR PROFESSIONALS Whether you're a general contractor estimating a bid, a framer cutting rafters, an electrician sizing wire, or a DIY homeowner planning a deck — Construction Expert A1 Pro has every calculation you need.

SUBSCRIPTION INFORMATION Subscription required for full access. Choose the plan that works for you:

• Monthly subscription
• Yearly subscription
• Lifetime access (one-time purchase, no recurring charges) Free trial available for new subscribers. Payment charged to Apple ID at confirmation of purchase. Subscriptions auto-renew unless cancelled at least 24 hours before the current period ends. Manage subscriptions in Settings > Apple ID > Subscriptions.

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