Squared: Contractor Calculator

Every number you need to build it, from the footing to the final circuit, in one offline toolbox.

Squared brings 230+ construction, electrical and engineering calculators together in one app. Work in feet, inches and fractions down to 1/16" or in metric. Results update live as you type, show the working behind every answer, and check against code where a code applies.

🏗️ BUILD • Concrete & masonry: slabs, footings, columns, stairs, rebar, block, brick, mortar, post holes • Framing & carpentry: stud walls, joists, rafters, hip & valley, stair stringers, decks, beams, board feet, plywood, miter angles • Roofing: area, pitch, shingles, metal roofing, gutters, trusses, soffit & fascia, ventilation • Interior & finishing: paint & primer, drywall, tile & grout with layout patterns, flooring, carpet, wallpaper, crown molding, insulation, cabinets • Earthwork & site: cut & fill, trenches, compaction, excavation, gravel, topsoil, mulch, sod, pavers, retaining walls, fences, drainage, irrigation • Electrical (NEC): wire size, voltage drop, breakers, load calculation, conduit fill, box fill, lighting, job cost • Plumbing and HVAC: pipe size, drain slope, water heaters, gas lines, septic, heat load, duct size, AC size and more • Estimating: material cost & markup, labor, bids, overhead, profit margin, change orders

⚙️ ENGINEER • Electrical & electronics: Ohm's law, AC power, power factor, filters, transformers, motors, batteries, op-amps, 555 timers, PCB traces, logic gates, number systems — with charts • Structural & civil: beams, frames, trusses, reinforced concrete, steel members and connections • Geotechnical, hydraulics, mechanical, chemical, aerospace, industrial, environmental, materials, surveying, petroleum and renewable energy

📏 JOB-SITE READY • Tape-measure entry like 12' 6-1/2" with a fraction keypad • Any unit on any field — the app converts for you • Code checks shown as pass/fail cards (IRC stairs, NEC voltage drop and conductor rules, ACI) • Step-by-step working, diagrams and a guide with formula, worked example and code references • Sunlight mode for bright days, keep-screen-on, big touch targets, dark theme • Works offline, no account needed

📁 FROM NUMBER TO PAPERWORK • Save results and reopen them with every input restored • Projects collect calculations, cut plans and photos, with a material list roll-up • Branded PDF reports and estimates with your logo, letterhead, colours and diagrams (Pro) • Share as text, PDF, CSV or image

🧰 HANDY TOOLS Unit converter, feet-inch & fraction calculator, area and volume, bubble level, scan measurements from a photo of a plan, and a cut list optimizer that lays out parts on sheets to waste less plywood.

💎 FREE AND FAIR Most tools are free. Every Pro tool can be tried 3 times for free. Squared Pro is a one-time purchase — no subscription — and unlocks every tool, removes ads, and adds unlimited projects, branded estimates, CSV/DXF export, the Smart cut optimizer, unlimited history and scans, and saved prices.

Available in English, Español, Português, Français, Deutsch, Italiano and हिन्दी.

Squared is a calculation aid. Always verify results against the codes adopted where you build and consult a licensed professional for structural, electrical and gas work.