Construction Tools
Civil engineering and construction material calculators for concrete volume, mix ratios, bricks, CMU blocks, plaster, foundations, beams, columns, and waste.
Free online Concrete & Masonry tools.
Aggregate Calculator
Uses a dry volume factor of 1.54 and an average coarse aggregate density of ~1500 kg/m³ (~100 lb/cu ft), consistent with the mix ratios used across the Concrete Material Calculator.
Block Quantity Calculator
Calculate concrete masonry unit (CMU) cinder blocks, mortar bags, and core grout fill volume for foundation and retaining walls.
Brick Quantity Calculator
Estimate brick units and mortar bags for single and double wythe walls with window/door opening deductions and waste allowances.
Concrete Material Calculator
Calculate exact dry raw materials (cement bags, sand tons, gravel stone, and water) for M15, M20, and M25 concrete design mixes.
Concrete Volume Calculator
Calculate concrete volume in cubic yards, cubic feet, and cubic meters for rectangular slabs and circular sonotube columns.
Concrete Weight Calculator
Uses the standard concrete density reference of ~150 lb/cu ft (2400 kg/m³), equal to approximately 4050 lb per cubic yard.
Mortar Calculator
Coverage factor default of 0.15 cu ft of mortar per sq ft of coursed masonry is a standard field estimating rule; each 80-lb bag of mortar mix yields approximately 0.45 cu ft.
Screed Calculator
Screed cement content is derived using the standard 1440 kg/m³ cement density and a 1.33 dry volume shrinkage factor for sand-cement screed mixes.
Free online Structural Elements tools.
Beam Concrete Calculator
Determine concrete volume and contact shuttering surface area for reinforced concrete beams based on cross-section and span.
Column Concrete Calculator
Calculate concrete volume and shuttering formwork surface area for square, rectangular, and round architectural columns.
Footing Concrete Calculator
Isolated footing volume = length x width x depth per footing x quantity, matching the same rectangular-volume approach as the Concrete Volume Calculator.
Foundation Concrete Calculator
Concrete density reference: ~150 lb/cu ft (2400 kg/m³), or ~4050 lb per cubic yard.
Foundation Cost Calculator
Estimate complete home foundation expenses covering excavation, monolithic concrete slabs, crawl spaces, basements, and pier foundations.
Slab Concrete Calculator
Calculate ready-mix concrete volume, crushed gravel sub-base tonnage, and steel rebar linear footage for patios, driveways, and garage slabs.
Stair Concrete Calculator
Each triangular step volume = 0.5 x rise x run x stair width, summed across all steps plus any landing slab volume.
Wall Concrete Calculator
Poured concrete wall volume = wall length x height x thickness, the same rectangular solid method used throughout these structural calculators.
Free online Framing & Lumber tools.
Board Foot Calculator
Standard board-foot formula: board_feet = (nominal thickness in x nominal width in x length ft) / 12.
Lumber Volume Calculator
Volume = (thickness in x width in x length in) / 1728 cu in per cu ft, the standard rectangular solid conversion for dimensional lumber.
Stud Spacing Calculator
Stud count = ceil(wall length in / spacing in) + 1, following standard 16 in or 24 in on-center residential framing spacing.
Timber Quantity Calculator
Base piece count = ceil(wall length ft x 12 / spacing in) + 1, at standard 16 in or 24 in on-center (OC) spacing, plus extra pieces for corners (+1 each) and openings (+2 each).
Wood Weight Calculator
Kiln-dried average densities: Southern Yellow Pine ≈36 lb/cu ft, Douglas Fir ≈34, SPF ≈28, Red Oak ≈44, White Oak ≈47, Cedar ≈23.
Free online Flooring & Tiling tools.
Carpet Quantity Calculator
Carpet is sold by the square yard (sq ft / 9), with waste added for seams and pattern matching. Note the 12 ft standard carpet roll width when planning seam placement.
Countertop Area Calculator
Countertop area = sum(segment length ft x standard depth ft) - cutout deductions (sink/cooktop), plus optional backsplash area (linear ft x height in / 12). Standard depth default is 25 in (≈2.08 ft).
Flooring Quantity Calculator
Boxes = ceil(area x 1.10 waste / sq ft per box), the standard flooring takeoff approach used for tile, laminate, vinyl, and engineered wood.
Hardwood Flooring Calculator
Order quantity = area x waste factor (10% standard layout, 15% diagonal layout), the standard hardwood flooring takeoff approach.
Laminate Flooring Calculator
Laminate flooring waste: 10% standard straight layout, 15% for diagonal layout, per standard flooring installation guidance.
Patio Paver Calculator
Paver count = ceil(patio area x 1.10 waste / single paver area), where single paver area = (length in x width in) / 144.
Paver Sand Calculator
Standard paver bedding sand layer is a 1-inch compacted depth: sand volume = patio area x (bedding depth in / 12) x 1.10 waste.
Tile Adhesive Calculator
One 50-lb bag of thinset/tile adhesive typically covers 40-50 sq ft with a 1/4 in notch trowel; this calculator defaults to the 45 sq ft/bag midpoint, adjustable.
Tile Grout Calculator
Uses the industry-standard trade formula: grout lbs = ((tile length in + tile width in) / (tile length in x tile width in)) x joint width in x joint depth in x 0.121 x area sq ft. Joint depth defaults to tile thickness.
Free online Finishes & Coatings tools.
Ceiling Area Calculator
Simple ceiling area = room length x room width, reported in square feet, square yards, and square meters for material ordering.
Plaster Material Calculator
Compute cement and sand quantities for interior and exterior wall rendering across 12mm, 15mm, and 20mm plaster thicknesses.
Wall Area Calculator
General-purpose wall area utility: gross area (length x height) minus door/window opening deductions, feeding into paint, drywall, or siding takeoffs.
Free online Site Management tools.
Free online Fencing & Decking tools.
Deck Beam Calculator
Typical residential deck beam span guide (reference table): doubled 2x8 → max 6 ft span, doubled 2x10 → max 8 ft span, doubled 2x12 → max 10 ft span. Always verify against local code span tables and actual joist span/spacing.
Deck Board Calculator
Board count = ceil(deck area x 1.10 waste / (board width ft x board length ft)); assumes standard 1/8-1/4 in gap spacing between boards, included in the nominal board width.
Deck Joist Calculator
Joist count = ceil(deck width ft x 12 / spacing in) + 1. Standard deck joist spacing is 16 in OC (or 12 in OC for some decking materials).
Deck Post Calculator
Post count = ceil(beam length ft / post spacing ft) + 1. Deck support posts are typically spaced every 6-8 ft along a beam.
Fence Material Calculator
Combines post count (ceil(length/spacing)+1), rail count (2-3 rails per section x section count), and picket count (fence length in / picket spacing in).
Fence Panel Calculator
Panel count = ceil(fence length ft / panel width ft), using standard 6 ft or 8 ft pre-built fence panels.
Fence Post Calculator
Post count = ceil(fence length ft / post spacing ft) + 1, using standard 8 ft OC (or 6 ft OC) post spacing.
Free online Doors & Windows tools.
Door Size Calculator
Standard door rough opening = door slab width + 2 in and door slab height + 2.5 in, the typical framing allowance for interior doors. Common interior door sizes: 24/28/30/32/36 in wide x 80 in tall; standard exterior doors: 36 in x 80 in.
Glass Area Calculator
Net glazed area deducts frame width from each side of the window opening: glazed area = window area - frame area, distinct from overall window frame area — used for glass pane ordering and cost.
Window Area Calculator
Area per window = (width in x height in) / 144; window-to-wall ratio % = total window area / total wall area x 100.
Free online Insulation & Drywall tools.
Drywall Joint Compound Calculator
Standard 3-coat joint compound coverage is 100-150 sq ft per gallon; this calculator defaults to the 125 sq ft/gal midpoint, adjustable to match your product.
Drywall Screw Calculator
Screws per 4x8 sheet ≈32 at 12 in OC fastening pattern on 16 in OC studs, per standard drywall installation practice.
Drywall Sheet Calculator
Sheets = ceil(total area x 1.10 waste / sheet area), using standard 4x8 ft (32 sq ft) or 4x12 ft (48 sq ft) drywall sheets.
Insulation Calculator
Batt coverage = (width in x length in) / 144 sq in per sq ft, computed exactly from your stated batt dimensions rather than a rounded constant. R-value per inch: fiberglass R-3.2, cellulose R-3.7, XPS R-5.0, closed-cell spray foam R-6.5, open-cell spray foam R-3.7 (DOE/ASHRAE reference values).
R-Value Calculator
Total R-value = sum of (material R-value per inch x thickness in inches) across each layer, using DOE/ASHRAE reference R/in values.
Thermal Resistance Calculator
Total R = insulation R + other layer R + interior air film (ASHRAE typical R-0.68) + exterior air film (R-0.17). U-value = 1 / total R.
Free online Roofing tools.
Gutter Length Calculator
Adds a 10% waste allowance to the raw eave perimeter length to account for corner miters, end caps, and overlap joints.
Roof Area Calculator
Roof area pitch multiplier = sqrt(1 + (rise/run)²), applied to the flat building footprint to find the true sloped roof surface area.
Roof Pitch Calculator
Pitch is expressed as "X/12" (rise per 12 in of run); angle in degrees = atan(rise/run).
Roof Rafter Calculator
Rafter length = run / cos(pitch angle); rafter count = ceil(building length ft x 12 / spacing in) + 1, at standard 16 in or 24 in OC.
Roof Shingle Calculator
Standard asphalt shingles: 1 roofing square = 100 sq ft = 3 bundles (33.3 sq ft/bundle); 10-15% waste is added for cuts, hips, valleys, and ridges.
Roof Slope Calculator
Slope % = (rise/run) x 100; angle in degrees = atan(rise/run) — the same rise-run geometry as pitch, framed as a percentage grade rather than X-in-12 notation.
Roof Truss Calculator
Truss count = ceil(building length ft x 12 / spacing in) + 1, using standard 24 in OC (or 16 in OC) truss spacing.
Roofing Material Calculator
Combines shingle bundles (3/square, 33.3 sq ft/bundle, +10-15% waste), underlayment rolls (standard felt #15 ≈400 sq ft/roll, synthetic/ice-and-water ≈200 sq ft/roll — adjustable), and roofing nails (~320 per square).
Free online Stairs & Safety tools.
Handrail Height Calculator
Handrail height per US residential code (IRC): 34 in - 38 in above the nosing, measured vertically.
Ramp Slope Calculator
ADA maximum ramp slope is 1:12 (8.33%), meaning at least 12 in of run for every 1 in of rise.
Stair Riser Calculator
IRC-standard comfortable riser height is 7 in - 7.75 in (7.75 in is the US residential code maximum). Number of risers = round(total rise / target riser).
Stair Stringer Calculator
Stringer (diagonal) length = sqrt(total rise² + total run²) — the Pythagorean theorem. Stringer count follows 1 per ≤36 in of stair width, minimum 2.
Stair Tread Calculator
Number of treads = number of risers - 1. Code minimum tread depth is 10 in; the comfort rule of thumb targets 2 x riser + tread ≈ 24-25 in.
Wheelchair Ramp Calculator
Per ADA 1:12 maximum slope, minimum ramp run = rise x 12. A 5 ft flat landing is required at least every 30 ft of ramp run.
Free online Painting & Finishing tools.
Paint Cost Calculator
Paint/primer coverage: 350-400 sq ft per gallon per coat (default 375), consistent with the app's existing paint quantity convention. Gallons = ceil(area x coats / coverage).
Primer Calculator
Primer coverage: 350-400 sq ft per gallon per coat, defaulting to the 375 sq ft/gal midpoint used consistently with the app's paint quantity calculator.
Wallpaper Roll Calculator
Standard US double roll covers ≈56 sq ft gross, but usable coverage after pattern-repeat waste is typically only 25-30 sq ft — this calculator defaults to the 30 sq ft/roll usable estimate, adjustable for your pattern repeat.