Square Footage Calculator
Add rooms and rectangles, get per-room areas and the combined total in sq ft, sq yd, and sq m.
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.
Volume Calculator
Box, cylinder, sphere, and cone volumes in cu ft, cu yd, US gallons, m³, and liters — every conversion exact.
Linear Feet Calculator
Total a cut list of pieces entered as feet and inches (or inches only), with counts and a cost at your price per foot.
Construction Unit Converter
Length, area, volume, and weight between imperial and metric — exact factors, feet + inches entry, printable chart.
Trade Geometry
Feet & Inches Calculator
Add, subtract, multiply, and divide tape-measure fractions exactly — a running tape in ft-in-1/16, decimal, and metric.
Stair Calculator
Total rise to riser count, exact riser height snapped to 1/16 in, total run, stringer length, angle, and common-IRC checks.
Roof Pitch Calculator
Pitch or measured rise/run to slope factor, common and hip/valley rafter lengths, roof angle, area, and squares.
Board Foot Calculator
Length × width × thickness ÷ 12 per piece, whole-order board feet, and cost at your price per board foot.
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.
Concrete Bag Calculator
One volume compared across 40, 50, 60, and 80 lb bags using manufacturer yield data.
Brick Calculator
Wall area minus openings, times BIA per-size coverage (joint included) — bricks to buy, with cited mortar bags for standard brick.
Concrete Block Calculator
Wall area over the nominal 16×8 in CMU face (exactly 0.889 sq ft, joint included), plus waste and cited mortar bag counts.
Concrete Footing Calculator
Footing length × width × depth × count to cubic feet, yards, and bags — volume for dimensions your plans already set.
Concrete Column Calculator
Round tube forms (π r² h) or rectangular piers, times the count — exact volume and bag counts, never sizing advice.
Post Hole Concrete Calculator
Hole cylinder minus the post below grade, times the hole count — bags to set posts, with the 3× guidance labeled.
Rebar Calculator
Grid bars each way from your spacing, linear feet with lap-splice allowance, and ASTM nominal weight.
Paver Calculator
Patio area over your paver’s face size, with cutting waste and the sand bedding volume at a depth you control.
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.
Topsoil Calculator
Footprint × depth to cubic yards of dirt, 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.
Sand Calculator
Area × depth to cubic yards of sand, with optional tons at the density your supplier quotes.
Sod Calculator
Lawn area over your farm’s roll size, with trimming waste — rolls to buy and pallets at your supplier’s count.
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.
Wallpaper Calculator
Honest strip-based roll counts: strips cut to whole pattern repeats, whole strips per roll — from your roll’s label dimensions.
Insulation Calculator
Area to insulate over the coverage printed on your package label, plus cutting waste — batts and rolls to buy.
Exterior
The building envelope, measured on the slope where it lives.
Roofing Shingle Calculator
Footprint × a computed pitch factor to true roof area, then squares and shingle bundles.
Siding Calculator
Walls + gable triangles − openings to siding squares (100 sq ft each) and pieces from your profile’s own spec.
Fence Calculator
Run ÷ spacing to sections, posts, and rails; pickets from your width + gap; setting concrete via the post-hole math.
Deck Material Calculator
Joists at your plan’s spacing plus rim, deck boards from width + gap and stock length — quantities, never spans.
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.