Construction Calculator

Construction Calculator estimates materials for concrete, rebar, brick, tile, paint, drywall, flooring, roofing, gravel and wall framing, and shows the formula behind every result, so you can trust the number before you order. No login, and it works with no signal on site.

ESTIMATE ANY MATERIAL

✓ Concrete — slabs, footings, columns, stairs, walls, circular slabs and post holes → m³, yd³, premix bags in 5 sizes and the ready-mix order with truck loads
✓ Pour list — add up several parts of one pour into one order
✓ Mix design — nominal mixes 1:1:2 to 1:4:8 → cement bags, sand, aggregate and water
✓ Brick & block — 5 sizes, single or double walls, openings subtracted → bricks and mortar
✓ Tile — tile count, grout, adhesive and spares
✓ Paint — walls minus doors and windows, coats, coverage → liters and gallons
✓ Drywall — sheets, screws and joint compound
✓ Flooring — boxes from area and coverage per box
✓ Roofing — pitch factor → real roof area, squares and shingle bundles
✓ Rebar — two-way mesh with lap splices, stock bars and weight, Ø6–Ø25 mm and #3–#8
✓ Slope & grade — rise/run, percent, 1:n, degrees and true length
✓ Plaster & screed — walls, ceilings and floors → mortar, cement and sand
✓ Plot area — rectangle, triangle, trapezoid or any 4-sided plot → m², hectares, acres
✓ Room takeoff — floor area, net wall area, perimeter, skirting and volume
✓ Gravel, sand & soil — gravel, stone, sand, topsoil, fill and mulch → m³, yd³, tonnes and bags
✓ Wall framing — studs, plates, headers, sills and sheathing sheets

BUILT FOR TRUST

• "Show formula" on every calculator, with all source values
• Adjustable waste % — you decide the margin
• Mix metric and imperial — every length field has its own unit
• Cost mode — add unit prices, get money totals in your currency
• Calculator keypad on every number field: + − × ÷ right where you type
• Search, pin favourites and a Recent row; each calculator remembers your last inputs
• 12 languages: English, Vietnamese, Spanish, French, Hindi, Indonesian, Japanese, Korean, Thai, Arabic and Chinese
• No login — your numbers, projects and prices stay on the phone

PROJECTS & QUOTES — FREE

• Add results from any calculator into one project with a grand total (free: 3 projects, one line each)
• PDF and CSV export with project and client name
• Share any result as text

PRO — NO ADS + PRO TOOLS

The 15 calculators, 3 projects, export and sharing are free, with ads. Pro is a subscription (3-day free trial on yearly) or a one-time purchase. Or watch a short video for 30 minutes of the Pro tools.

★ No ads
★ Price book — save material prices once, reuse them anywhere
★ Formwork — plywood sheets with reuse count and release oil
★ Structural steel weight — round, square, flat, pipe, RHS/SHS, angle and plate
★ Fence & deck layout, concrete stairs with code warnings, cut & fill earthwork
★ Markup & tax on projects, in the total, PDF and CSV
★ Unlimited projects and line items
★ Longer pour lists (free: 3 parts), saved bulk materials, and a framing cut list
★ Excel export of one project or all projects (items, totals, workings); all projects to CSV too

ADS & PRIVACY

The free version shows ads from Google AdMob and Unity Ads, which may use your device's advertising ID; you are asked for consent where the law requires it. Anonymous usage data (screens, features, error codes) helps improve the app — never your numbers, project names, prices or results. Turn it off in Settings.

Results are estimates; check structural work against your local code. Plot areas are guidance, not a land survey.

Made for builders, painters, DIY renovators and estimators.

Recent changes:
New in 1.10.0:
- Stairs: new stair type picker; solid steps on grade now get the full concrete volume
- Brick mortar now includes the waste allowance
- Floor rebar counts the edge bar; US #4 weight follows ASTM A615
- Imperial drywall uses real 4×8 ft sheets, and more fields work in ft, ft² and yd³
- Large prices in the price book no longer change when edited
- Saved inputs stay correct after changing language or units
- New app icon