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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