Browse 23 free calculators in the Construction category.
House Building Cost Calculator - Estimate the total cost of building a house from the ground up. Three construction types, three finish levels, regional price adjustments and a materials-vs-labor split.
Paint Calculator - How many gallons do you actually need? Enter the wall area, pick the paint type and number of coats. The calculator adds a safety margin and shows cost per square foot.
Tile Calculator - How many tiles, how much adhesive, how much grout? Enter the room size, pick a tile format and joint width. The calculator covers cement, flexible and deformable adhesives with automatic large-format correction.
Paving Stone Calculator - Driveway, patio or walkway - enter the area and stone size, get the exact count plus aggregate and sand tonnage. Three thickness options for pedestrian, car and heavy vehicle loads.
Plaster Calculator - Three plaster types, three consumption rates. Cement render at 1.75 lb per mm per sq ft, gypsum at 1.1, acrylic at 2.75. Pick the type, set the thickness and number of coats - the calculator returns total weight and bag count.
Concrete Calculator - How much concrete for a slab, footing or sidewalk? Enter length, width and thickness, pick the mix ratio, and get the volume in cubic yards with cement bags, sand and gravel quantities plus a cost estimate.
Insulation Calculator - Pick fiberglass, mineral wool, rigid foam or spray foam. Enter wall or attic dimensions, subtract windows, set a waste margin, and get the coverage area, package count, R-value and a cost estimate for any thickness from 2 to 12 inches.
Roof Calculator - Four roofing materials, three roof shapes, one materials list. Enter the slope length and width of each roof plane, pick asphalt shingles, metal panels, clay tiles or roll roofing, and get the total area in roofing squares with piece counts, underlayment rolls and a cost breakdown.
Flooring Calculator - Measure the room, pick laminate, vinyl or hardwood, and get the total area with package count, underlayment and a full cost breakdown. Covers waste allowance for rectangular and irregular rooms.
Brick & Mortar Calculator - Same wall, two unknowns - how many bricks and how much mortar. Enter the wall dimensions, pick brick type and bond thickness, subtract windows and doors, and get a materials list with bag count.
AAC Block Calculator - Autoclaved aerated concrete weighs roughly five times less than standard concrete block and insulates three times better per inch. This calculator turns your wall dimensions into an exact block count with adhesive bags and pallet estimates for seven common AAC sizes.
Roof Pitch Calculator - Calculate roof pitch in degrees and percentage from ridge height and span. The tool checks which roofing materials fit your angle and computes rafter length and ridge height for any building width.
Rebar Calculator - Enter the dimensions of any concrete element - slab, footing, beam or column - and get the total reinforcement steel weight in kg, bar count and total length. Covers bar diameter, spacing, concrete cover and lap splices.
Self-Leveling Screed Calculator - How many bags of self-leveling compound does your floor actually need? Enter the room area, layer thickness and product consumption rate to get the exact bag count, total weight and cost with a built-in reserve for uneven substrates.
Decking Calculator - How many deck boards does a 20 x 12 ft patio actually need? Enter the deck dimensions, board size and gap width - get the exact board count, total linear footage and material cost.
Wood Stain Calculator - One gallon covers the label - but your deck soaked up half of it. Enter the surface area, wood type, coat count and container size to get the exact number of cans, total volume and cost.
Rafter Calculator - Four numbers decide your rafter size: span, spacing, snow load and roofing weight. Enter them here and the calculator returns the minimum lumber dimension, rafter count, total board feet and estimated cost.
Roof Batten Spacing Calculator - Roofing material, roof slope dimensions and number of planes - the calculator returns batten spacing, piece count and total linear feet. For shingles and rolled roofing it switches to full sheathing with OSB board count.
Slab Formwork Calculator - How many shores, beams and panels does your concrete slab need? Enter slab dimensions, story height and concrete thickness to get a full material list with cost estimate for system or traditional formwork.
Plumbing Pipe Calculator - Cold water, hot water, drain, radiant floor, radiator heating or gas - pick the system type and get pipe footage, fitting count, diameter recommendation and material cost estimate for any residential project.
Drywall Anchor Calculator - How many disc anchors for your wall, ceiling or attic? Provide surface dimensions and spacing - get the fastener count, package quantity and screw total. Works with adjustable disc anchors such as Atlas M-System 3G.
Electrical Cable Length Calculator - Every rewiring job starts with the same question: how many meters of cable? Split the answer by cross-section - 1.5, 2.5, 4 and 10 mm2 - add a waste allowance and get a material list with optional cost estimate.
Distribution Board Calculator - Size a consumer unit from your circuit count. The calculator adds up breaker modules, RCDs, the main switch and any extras, applies a spare-capacity margin, and recommends the smallest standard enclosure that fits.