ConstructionCalculations.net

Construction Calculators

Free construction and home-improvement material estimators that run entirely in your browser: no account, and nothing you enter is transmitted or stored. Each tool turns measurements into material quantities, applies a waste factor you control, rounds up to whole packages, and prices the result only with costs you supply. Every calculator has its own page with the formula, a worked example, and a FAQ.

Measurement

Get the base numbers right before pricing anything.

Concrete & Masonry

Pours and bag counts, from manufacturer yield data.

Concrete Slab Calculator

Slab length × width × thickness to cubic yards, with waste and a quarter-yard ready-mix ordering figure.

Aggregate & Landscaping

Bulk material by the yard, bags where they make sense.

Gravel Calculator

Area × depth to cubic yards, with optional tons at the density your supplier quotes.

Mulch Calculator

Bed area × depth to cubic yards and standard 2 cu ft bag counts, with a bulk comparison.

Interior

Walls, floors, and finishes — waste applied before the round-up.

Paint Calculator

Perimeter × height minus openings, times coats, over adjustable coverage — gallons to buy.

Drywall Calculator

Walls plus optional ceiling minus openings, with waste, over your sheet size — sheets to buy.

Flooring Calculator

Floor area plus waste to a purchase area, then whole boxes at your box coverage.

Tile Calculator

Your tile size and grout gap give the real per-tile footprint, then tiles and boxes.

Exterior

The building envelope, measured on the slope where it lives.

How every estimate here works

The same five-step pipeline sits behind every tool: geometry turns measurements into an area or volume, coverage data converts that into material units, a waste percentage pads the quantity before rounding, the round-up goes to whole bags, boxes, sheets, or bundles, and a cost appears only when you enter a price. Coverage constants come from manufacturer documentation and are cited in the code; anything that varies by product — flooring box coverage, tile size, gravel density — is always your input, never a built-in guess.

These calculators estimate quantities only. They do not judge structural adequacy, code compliance, or permits — confirm those with a licensed professional. Details on conventions, sources, and testing are on the methodology page.