Construction Expert A1 PRO

150+ construction calculators for stairs, rafters, concrete, framing & take-offs. Feet, inches & fractions. Live drawings. Offline. Pay once. Lifetime plan available.

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.

Payment is charged to your Apple ID at confirmation of purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in Settings > Apple ID > Subscriptions.

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