Free Construction Calculators & Estimating Tools
39 professional calculators for contractors, builders, estimators, and homeowners concrete, framing, roofing, MEP, and bid math that runs right in your browser. No sign-up, no fees.
Tool directory
Explore construction tools
Seven trade categories, every calculator free. Pick a category to see exactly what each tool calculates.
- Concrete, Masonry & EarthworkCubic-yard quantities, sack math, rebar and block counts priced with waste before you pour.5 toolsView Tools
- Framing, Carpentry & RoofingStud walls, stair stringers, rafter lengths, board feet and roofing squares for the whole envelope.5 toolsView Tools
- Drywall, Tile & FinishesSheet goods, paint gallons, flooring and tile box counts with layout waste built in.7 toolsView Tools
- Site Work, Decks & FencingCut/fill dirt, aggregate tonnage, deck boards, fence runs and paver quantities for the site.8 toolsView Tools
- MEP Quick-Check EstimatorsWire and conduit runs, light layouts, and BTU sizing sanity-checks for the trades.4 toolsView Tools
- Bidding, Markup & FinancialsTurn job costs into bid prices: markup vs margin, overhead recovery, and break-even math.6 toolsView Tools
- Field Converters & Master ProposalFeet-inches-fractions converters, unit conversions, and right-triangle helpers that live on every job.4 toolsView Tools
How it works
Tape measure to bid in minutes
A simple workflow that takes you from a jobsite measurement to a priced proposal.
1Find your tool
Browse the seven trade categories or hit ⌘K to search all 31 calculators by name, tag, or trade.
2Run the math
Enter dimensions with fraction-friendly inputs. Every result shows net quantity, waste, and a bill of materials.
3Price the bid
Add any result to the Master Bid Cart, apply markup and tax, and export a client-ready proposal PDF.
Built on trust
Free tools, honest math
No subscriptions, no data collection, no fine print just calculators that respect your time and your privacy.
Free forever
Every calculator is free no trials, no paywalls, no feature gates.
No account
No sign-up or login. Open a tool and start calculating immediately.
Private by design
All math runs on your device. Your numbers are never uploaded anywhere.
Works offline
After your first visit the app keeps working on the jobsite, no signal needed.
FAQ
Questions contractors ask
Is BuildCalc Pro really free?
Yes every calculator is free with no account, no trial, and no feature gates. Your estimates are stored in your own browser, not on our servers.
Do I need an internet connection on the job site?
Only for the first visit. After that the app is installable and works offline all math runs 100% in your browser.
How is this different from a phone calculator app?
BuildCalc Pro speaks construction: feet-inches-fractions, waste factors, 16-inch on-center spacing, NEC and IRC code checks, and one-tap bill-of-materials lines that flow straight into a bid proposal.
Will my estimate data be sold or uploaded?
No. There is no database, no login, and no analytics beacon. Your numbers never leave your device unless you explicitly export them.
Can I print a material list for the supplier?
Yes every calculator has a Print / Export slip button that produces a clean, ink-friendly material list with net quantities, waste, and order totals.
Which calculators are available?
All 31 are live: concrete (slabs, rebar), CMU block and mortar, framing and drywall, roof pitch and shingles, rafter cut lengths, stairs with IRC code checks, tile and grout, paint, flooring, drywall texture and mud, insulation, trim and molding, siding and housewrap, decks, fences, pavers, excavation and dirt haul, retaining walls, aggregate tonnage, asphalt paving, HVAC sizing, PEX plumbing, electrical conduit and voltage drop, true labor burden rates, subcontractor piece-work, daily overhead breakeven, markup-vs-margin bid math, a feet-inches-fraction keypad, a unit converter plus the Master Proposal Builder that compiles everything into a client-ready PDF.
Your next bid starts here.
Free construction calculators for every trade no account, no fees, works offline on the jobsite.