Construction Calculator

Construction Calculator estimates materials for concrete, mix design, rebar, formwork, structural steel, brick, tile, paint, drywall, flooring and roofing — and shows the formula behind every result, so you can trust the number before you order a single bag. No login, and the calculators keep working with no signal on the job site. ESTIMATE ANY MATERIAL ✓ Concrete — slabs, footings, round and square columns → m³, yd³ and premix bags in all 5 sizes at once (40/60/80 lb and 25/40 kg) ✓ Mix design — nominal mixes 1:1:2 to 1:4:8 → cement bags, sand, aggregate and mixing water ✓ Brick & block — 5 standard sizes including concrete blocks, single or double wythe walls, openings subtracted, adjustable mortar joint → brick count, mortar volume and dry-mix weight ✓ Tile — tile count by size and grout gap, grout in kg, adhesive, spare tiles ✓ Paint — walls minus doors and windows, coats, adjustable coverage → liters and gallons ✓ Drywall — sheets, screws and joint compound for 4×8, 4×10 and 4×12 panels ✓ Flooring — boxes needed from area and coverage per box ✓ Roofing — pitch factor from flat to 12/12 → real roof area, squares and shingle bundles ✓ Rebar — two-way mesh with LAP SPLICES: bar count, splices, ordered length, stock bars and weight for Ø6–Ø25 mm and US #3–#8 ✓ Slope & grade — rise/run, percent, 1:n and degrees, plus the true slope length to order ✓ Plaster & screed — walls (openings deducted), ceilings and floor screeds → mortar, cement and sand ✓ Plot & land area — rectangle, triangle, trapezoid or any 4-sided plot (4 sides + 1 diagonal) → m², hectares, acres, perimeter ✓ Room takeoff — length × width × height plus doors and windows → floor area, net wall area, perimeter, skirting and volume in one go BUILT FOR TRUST • "Show formula" on every calculator — see exactly how your number was computed, with all source values • Adjustable waste % — you decide the safety margin, not the app • Mix metric and imperial in one calculation — every length field has its own unit selector • Cost mode — add unit prices, get money totals • Metric or imperial default units, numbers formatted for your locale, your own currency symbol (₫, $, €…) • No login — your numbers, projects and prices stay on the phone HOW IT WORKS Pick a calculator, type dimensions in any unit, set waste % and prices, check the formula, then save the line to a project and export PDF or CSV. PROJECTS & QUOTES — FREE • Project estimates — 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 — send a clean quote in minutes • Share any result as text from every calculator PRO — NO ADS + PRO TOOLS The 13 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 in any calculator ★ Formwork — contact area for slabs, beams, columns, walls and footings → plywood sheets with reuse count and release oil ★ Structural steel weight — round, square, flat, pipe, RHS/SHS, angle and plate → kg/m, total kg and tonnes ★ Fence & deck layout, concrete stairs with code warnings, cut & fill earthwork with swell and shrinkage factors ★ Markup & tax — add profit and VAT to a project; both show in the total, PDF and CSV ★ Unlimited projects, each with as many line items as you need 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.