Construction Expert A1 PRO

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/