Trusted by 1M+ contractors, builders and engineers worldwide.
Construction Calculator A1 Pro is a complete civil engineering toolkit for engineers, contractors, architects, site supervisors, quantity surveyors (QS) and real estate professionals. 500+ calculators take you from material estimation and RCC design all the way to a client-ready Bill of Quantities - on your iPhone, iPad and Apple Watch.
EVERYTHING UNLOCKED, NO ADS
- No advertising anywhere in the app
- Unlimited calculations - no daily cap
- Every calculator unlocked, including Draw Shape, GPS Area and the specialist trade tools
- Unlimited favourites, recents and custom formulas
- Cloud sync across your devices, included
- One purchase. No subscriptions, no in-app purchases.
IDEAL FOR
- Civil Engineers & Contractors - RCC, beam, column, footing & reinforcement
- Quantity Surveyors & Estimators - Fast, accurate material take-offs
- Site Supervisors & Project Managers - On-site calculations and costing
- Architects & Builders - Area, volume and design measurements
- DIY Home Builders & Real Estate Professionals - Land and plot area
NEW - BILL OF QUANTITIES (BOQ)
- Add any calculation result straight to a BOQ
- Organise work by project, track total value and % priced
- Professional BOQ report with your company header and signature
- Export as PDF or Excel and send to clients
NEW - AUTOMATIC DRAWINGS
- Calculators generate a dimensioned drawing of what you entered
- Brickwork, steel/BBS shapes, concrete sections, excavation, stairs and more
- Drawings and a DIMENSIONS/QUANTITIES panel in every PDF report
NEW - MATERIAL PRICE LIBRARY
- Store your own material rates in your own currency
- Rates auto-fill into cost fields across the app
- Six regional presets with local materials and units
NEW - APPLE WATCH APP
- Converter, material weight, volume, diagonal and rebar on your wrist
- Prices synced from your iPhone, with full calculation history
NEW - LEARN: STUDY & QUIZ
- Civil engineering articles, checklists and reference charts
- Topic quizzes with instant explanations
- Daily streaks, XP, stars and achievement badges
QUANTITY CALCULATORS
- Concrete - slab, beam, column, footing, staircase, retaining wall, culvert
- Steel & BBS - reinforcement weight, cutting length, bar bending schedules
- Brick, Block & Plaster - walls, bonds, arches, AAC/CLC blocks
- Flooring, Tile & Plywood
- Paint - litres/gallons with coats and coverage
- Water Tank - rectangular, cylindrical, spherical, capsule and more
- Excavation & Backfill, Anti-Termite, Shuttering, Plum Concrete
- Roofing - area, pitch, rafter length, gable and flat roofs
- Infrastructure - road, rail, dam, sewage, water supply
- Specialist trade tools - drywall, deck stain, vinyl fence, ladder angle and length, man-hours, arch
- Construction Cost Estimator with breakdown charts and client quotations
AREA & VOLUME
- Plot area, rectangle, square, triangle, circle, trapezoid, polygons
- Cube, cone, cylinder, sphere, prism, pyramid, frustum and more
- Draw Shape and GPS Area for irregular plots
UNIT CONVERTER
- Length, area, volume, weight, pressure, power, speed, time, fuel, angle, density
- Feet-inch-fraction construction calculator with a running tape
SAVE, SHARE & SYNC
- Save calculations, add notes and photos, organise in folders
- Export PDF and Excel reports with your company logo and signature
- iCloud and Google Drive backup
- Cloud sync across all your devices
WHY CHOOSE CONSTRUCTION CALCULATOR A1 PRO
- Metric & Imperial - switch instantly in any calculator
- Works offline - calculations need no internet
- 16 languages
- Light and dark themes
- Home Screen widgets and Quick Actions
- Clean interface built for the jobsite
NEED HELP OR HAVE SUGGESTIONS?
We value your feedback. Contact constructioncalculatorallinone@gmail.com for support or feature requests.
