Frequently Asked Questions

No. All calculators work instantly in your browser — no sign-up, no email, no account needed. Just open the page, enter your measurements, and get results.

Every calculator uses industry-standard formulas:

• Concrete: ASTM C94 / ACI 318 standards — bag counts verified against manufacturer specs
• Paint: ~350 sqft/gallon coverage, standard deductions for doors and windows
• Flooring & Tile: 10–15% waste factor, professional spacing standards
• Roof Pitch: Rise-over-run trig conversion per NAHB guidelines

All estimates include a waste factor. Always order 5–10% extra for waste, cuts, and errors.

Absolutely. FixitCalc works on any device — phone, tablet, laptop, or desktop. No app download needed. All calculators are mobile-responsive and easy to use on a job site.

Yes. All 18 calculators are 100% free, no catches. We support the site through advertising so you can estimate your projects without paying a dime.

We research professional construction standards for every calculator:

• Concrete: ACI 318 (American Concrete Institute)
• Flooring: NWFA (National Wood Flooring Association)
• Paint: Manufacturer coverage specs
• Roofing: NAHB (National Association of Home Builders)
• All calculators include conservative waste factors and round up where appropriate

We add new calculators regularly based on user requests. If you need something specific — a stair calculator, a roofing material estimator, or anything else — reach out through our contact page and let us know.

Our calculators give material estimates — they don't include labor, permits, or site-specific conditions. Use them for material budgeting and to verify contractor quotes make sense, but always get 2–3 professional bids for the full project scope.