Construction Calculator A1 Pro2026.08.04 - App Store

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.

Version History Our biggest update yet!

ADVANCED RCC CALCULATORS (NEW)
• Column, Footing, Beam & Slab with real geometries and regional bar standards for India, USA, Canada, UK, Australia & Gulf
• Live engineering drawings that follow your inputs — tie styles, curtailment, mats and zones
• Export straight to a Bar Bending Schedule, or share a professional PDF report with the drawing included

TILE QUANTITY (NEW)
• Floor tiles, wall tiles & skirting as three focused calculators
• Generated layout plans and wall elevations, custom tile sizes, dado bands and openings

PAINT & FINISHES (NEW)
• Putty, primer, texture & paint with coverage-based quantities and smart pack sizes
• Wood & metal finishes measured with standard coefficients

MATERIALS & RATES
• Your one steel rate now prices every rebar size, metal section and alloy
• Brick sizes show units and cost per m²; ready-mix grades price per m³
• Set your own labour rates per trade, and price concrete the way you buy it — ready-mix or site-mix

BAR BENDING SCHEDULE, REDESIGNED
• Clean, mobile-friendly editor with add-row cards and automatic weight-by-diameter totals
• Sign by hand and export a professional PDF or Excel sheet

Plus dozens of fixes and UI polish across the app. 2026.08.04 Sep 7 Electrical Calculations — a complete new section, 69 calculators.

LOAD CALCULATION
Size a whole structure's electrical load in one place: connected load, maximum demand, design current, phase balance and the sanctioned load figure your utility asks for. Export the sheet as Excel or PDF with your company details on it.

CABLES & CONDUIT
Cable sizing, voltage drop, maximum run length, cable weight and drum counts, conduit fill, cable tray sizing and support quantities.

PROTECTION & MOTORS
Breaker and MCB sizing, RCD/RCCB selection, fault level, motor full-load current, starter and contactor selection, power factor correction.

LIGHTING
Lumen method fixture counts, illuminance checks, fixture spacing, lighting power density and street lighting layouts.

EARTHING & LIGHTNING
Earth conductor sizing, electrode resistance, multiple electrodes, earth pit materials and lightning protection.

POWER SOURCES
Transformer sizing and loading, DG set sizing and fuel cost, UPS and battery banks, solar PV capacity, panel counts and off-grid storage.

QUANTITY & BOQ
Wiring point, wire, conduit, termination and distribution board estimators that feed straight into your BOQ.

CONVERTERS
Electrical units, conductor size (mm² / AWG / kcmil / SWG) and illuminance (lux / foot-candle).

Everything follows your region — India, USA, Canada, Australia, Europe and the Gulf each get their own voltages, demand factors and standard breaker ratings.

ALSO NEW
• Metal Library — alloy and section reference data
• Material Library with specification lookup
• New BOQ sheet flow and house-cost standards
• Region-accurate concrete grade data
• The Quantity tab now orders itself by your role and region
• Calculator inputs sit two per row, so there's less scrolling
• A What's New screen, so you can see each update at a glance

FIXES
• Concrete quantities showed NaN after changing the grade
• The keyboard's Next could skip a field in the metal calculators
• PDF export could hang on the web
• Grid and layout fixes on wide screens

Electrical sizing results are indicative and should be verified by a licensed electrical engineer against your local code. 2026.08.03 Aug 24 NEW — Formwork Sheet
Plan a whole project's shuttering in one place. Build an element
schedule and the app derives your ply sheets, battens, walers, ties,
props, back-props and a complete scaffold list from it — then tells
you the PEAK quantity you actually need to buy, not the cumulative
area you bill. Includes cycle planning, de-shuttering sets and eight
validation checks that flag a take-off before you issue it.
Export a branded PDF, push quantities to a BOQ, or send a row
straight in from any shuttering calculator.

NEW — Brick Size Library
Your own brick and block sizes, saved once and used everywhere.
Region-aware seed catalogue, a default per brick/block type, and
auto-fill across all 24 brickwork calculators. Backed up and synced
with the rest of your data. Open it from Settings or the Brick Work
page.

NEW — False ceiling calculators
Gypsum Ceiling, POP Ceiling and Grid Ceiling, with section and plan
drawings, regional advisories, and material rates stocked for all
six regions.

IMPROVED — Shuttering, redrawn
17 element calculators, each with a new two-view drawing that shows
WHICH FACES GET FORMWORK

IMPROVED — Quantity tab
Calculators are now ordered by how relevant they are to your role
and region. Nothing is hidden; your favourites still come first. 2026.08.02 Aug 17 This is our biggest update yet.

DRAWINGS
• Calculators now generate a dimensioned drawing of exactly what you entered
• The diagram highlights the dimension you're typing, so you always know
which side is which
• Drawings, a DIMENSIONS panel and your company branding are included in
PDF exports

WORK ANYWHERE
• Apple Watch app — converter, material weight, volume, diagonal and rebar
• Use the app in any browser
• Cloud sync across your devices, plus Google Drive and iCloud backup
• Sign in with Google or Apple

BUILT FOR YOUR REGION
• Six regions with local materials, units and bar sizes
• City selector applies a local cost multiplier
• Region-aware mix design, rebar standards and reference data

CONSTRUCTION COST CALCULATOR
• Rebuilt with Standard / Premium / Luxury comparison and a phase timeline
• Cost breakdown charts, professional quotation PDF, Excel and image export

NEW CALCULATORS & TOOLS
• Rebar Tools — six new calculators, lap length with splice cases, and a
cover block analyzer
• Volume calculators now give material weight and density
• Unit converter now converts prices between units
• Concrete Strength, plus 28 more concrete calculators with their own diagrams

LEARN
• Study articles, checklists and reference charts
• Topic quizzes with instant explanations
• Daily streaks, XP, stars and achievement badges

FASTER TO USE
• Redesigned home with Continue Working, pinned tiles and collapsible
categories
• Calculator keypad merges concrete, steel and roof functions, with
Area/Volume/Perimeter power-ups, slope and centre-to-centre spacing
• Two-column inputs, pinned diagrams and auto-calculate on calculator pages
• Built-in help with worked examples, in all 16 languages
• Quick actions — long-press the app icon for your most-used tools

Questions or ideas? constructioncalculatorallinone@gmail.com 2026.08.01 Aug 14 What’s New

Tired of searching for the right construction formula? We’ve got you covered.

• Added new calculators for Water Tanks, Walls, Staircases, Footings, Gutters, and Tubes to handle daily site calculations easily
• Enhanced House Cost Calculator to generate professional quotations and branded PDFs for clients
• Can’t find a formula? Use Custom Calculators to create and save your own calculations
• Keep all project details organized with Rich Notes, project-wise folders, and support for images, videos, and file attachments
• Faster and smoother construction calculations with quick-action buttons designed for site use
• Access essential material details instantly with the new Material Library

This update focuses on saving time, reducing manual work, and making construction calculations simpler and more organized. 2026.04.06 Apr 6 What’s New

Tired of searching for the right construction formula? We’ve got you covered.

• Added new calculators for Water Tanks, Walls, Staircases, Footings, Gutters, and Tubes to handle daily site calculations easily
• Enhanced House Cost Calculator to generate professional quotations and branded PDFs for clients
• Can’t find a formula? Use Custom Calculators to create and save your own calculations
• Keep all project details organized with Rich Notes, project-wise folders, and support for images, videos, and file attachments
• Faster and smoother construction calculations with quick-action buttons designed for site use
• Access essential material details instantly with the new Material Library

This update focuses on saving time, reducing manual work, and making construction calculations simpler and more organized. 2026.01.04 Jan 23 All new calculators (water tanks, walls, staircases, footings, gutters, tubes)
New features (house cost, custom calcs, rich notes, material library) 2026.01.03 Jan 21 New Formula Generator
Can’t find a specific calculation? Create your own custom formulas, save them, and reuse anytime. Built for real-world construction flexibility.

Enhanced Construction Calculator
Perform fast and accurate calculations like feet-inch + feet-inch, diagonal measurements, and area & volume using dedicated calculator keys.

Faster & Smarter Experience
Optimized performance for quicker results and smoother usage on site.

This update makes Construction Calculator A1 more powerful, customizable, and efficient for engineers, contractors, and construction professionals. 2026.01.02 Jan 12 What’s New in This Update

• New Formula Generator
Can’t find a specific calculation? Now create your own custom formulas, save them, and reuse them anytime. Designed for real-world construction needs with complete flexibility.

• Enhanced Construction Calculator
Quick and accurate construction calculations are now easier than ever. Perform common operations like feet–inch + feet–inch, diagonal calculations, and area & volume calculations directly using dedicated calculator keys.

This update makes calculations faster, smarter, and more customizable for site engineers, contractors, and construction professionals. 2026.01.01 Jan 6 * Multiple language support added
* Dam & Sewage Calculations: Added capacity, flow, and tank design.
* Water Supply & Rail: New tools for demand, pump power, gradient, and braking.
* Road & Brickwork: Pavement, slope, bond types, and paver block updates.
* Excavation: One trip volume and trip count.
* Other Enhancements: BOQ sharing, quiz, and location-based units. 2024.09.01 10/02/2024 *Precast Boundary wall quantity added
*Shoe size converter added
*minor bug fixes 10.2023.01 07/10/2023 Following quantities added
* Arc calculator
* Slope backfilling
* Helix Bar
* Plum Concrete By Volume
* Partly Fill Rectangular Tank
* Partly Fill Circular Tank
* Super Elevation 10.2022.01 10/24/2022 New quantity added
- Baluster
New areas added
- Kite
- Heptagon
- Decagon
New volumes added
- Pipe Culvert
- Step Wall
- Triangular Slice 09.2022.01 09/30/2022 * Minor bug fixes 2.5.5 07/27/2022 (1) Concrete quantities added -
- Box Footing
- Trapezoidal Footing
- Dog legged Staircase
- Various wall shapes
- various curb stone shapes
- Square tube
- Various gutter shapes
- Configure your own mix designs in new mix design section
- Detailed calculation added with pie chart
(2) Brick work quantities added -
- Stretcher bond
- Header bond
- English bond
- Flemish bond
- Cube
- Wall
- L Wall
- C Wall
- Rectangular Chamber
- Wall with door
- Wall with arch door
(3) Added in Area Section-
- Semi circle
- Ring Area calculator
- Diamond Area Calculator
- 3 different shapes
(4) In volume section-
- Hexagonal Prism
- Cylindrical Tube
- Rectangular Tube
- L Shape
- Slope Wall
- Sector Of sphere
(5) In Converter section-
- Conductivity
- Acceleration
- Magnetic field strength
- Heat Flux
- Specific volume
- Specific Heat
- Luminus Intensity
- Heat Transfer
(6) Informative home page icons
(5) small bug fixes 2.5.3 06/15/2022 Update :
1. Search option added
2. UI enhancements for increasing user experience
3. Following converters added
- Fuel Converter
- Illumination Converter
- Heat Converter
- Viscosity Converter
- Magnet Field Converter
- Inertia Converter
- Permeability Converter
- Resolution Converter
- Surface tension Converter
- Torque Converter
- Flow Converter
- Radiation Converter
- Luminance Converter
4. Perimeter added in area calculators 2.5.2 06/06/2022 Update :
1. Search option added
2. UI enhancements for increasing user experience
3. Following converters added
- Fuel Converter
- Illumination Converter
- Heat Converter
- Viscosity Converter
- Magnet Field Converter
- Inertia Converter
- Permeability Converter
- Resolution Converter
- Surface tension Converter
- Torque Converter
- Flow Converter
- Radiation Converter
- Luminance Converter 2.5.1 06/05/2022 **Update
1. Following quantities added
AC Capacity
Swimming Pool
Solar(Electric)
Solar Water heater
Plywood Sheet
Paver Calculator
Plum Concrete
Rain Water Harvesting
Waterproofing
Shuttering
Tile Grout
2. New areas added
Sector
Pentagon
Hexagon
Octagon
Trapezoid
More Shapes
3. New volumes added
Parallelepiped
Sliced Cylinder
Barrel
4. Converters added
Resistance
Current
Voltage
*New study sections added
Construction material
Structural Analysis
Construction Management
Surveying
& many more 2.5.0 05/04/2022 * bug fixes 2.0.2 01/29/2022 * Metal calculator added
* Bill of quantity added(BOQ)
* minor bug fixes 2.0.1 12/23/2021 Metal calculator added, Bill of quantity (BOQ) added, currency selection option in quantity, quiz, etc. 2.0.0 12/03/2021 1.0 10/02/2021