🏠Construction & Home
Free construction calculators and building material estimators for square footage, concrete, flooring, drywall, paint, roofing, and more.
A construction calculator helps you turn measurements into material estimates before you buy, haul, cut, or pour. This category brings together square footage, concrete, gravel, mulch, drywall, paint, roofing, flooring, tile, framing, insulation, rebar, and related home project calculators so you can size a job, estimate waste, and order with fewer surprises.
What You'll Find Here
You will find tools for both early planning and material-specific estimating. Area and layout tools help you measure rooms, surfaces, decks, roofs, ramps, stairs, and other spaces correctly. Material estimators help you calculate concrete volume, drywall sheets, paint coverage, tile counts, flooring boxes, gravel depth, brick quantities, insulation needs, studs, pavers, shingles, and more. Some tools also help with support calculations such as board feet, roof pitch, pipe volume, airflow, slope, and grade.
All Construction & Home Tools
Square Footage Calculator
Calculate square footage instantly for any room or surface. Supports rectangles, circles, and triangles. Free, fast, and accurate area calculator in square feet.
Open toolConcrete Calculator
Work out how many cubic yards of concrete a slab needs, and how many 40, 60, or 80 lb bags that equals. Includes the bags-per-yard rule.
Open toolMulch Calculator
Work out exactly how many bags or cubic yards of mulch you need from bed size and depth. Includes waste allowance and the bags-per-yard rule.
Open toolGravel Calculator
Work out how many tons or cubic yards of gravel you need from length, width, and depth. Includes the tons-per-yard rule and coverage per ton.
Open toolFuel Cost Calculator
Estimate trip fuel use and total driving cost from distance, fuel efficiency, fuel price, and trip count for commutes, job runs, and road trips.
Open toolPaint Calculator
Estimate paint needed for a rectangular room from wall size, coats, coverage rate, doors, windows, and waste allowance. Returns gallons, liters, and net wall area.
Open toolTile Calculator
Estimate tile count, coverage, and waste for floors, showers, backsplashes, and other tile layouts using room size and tile dimensions.
Open toolFlooring Calculator
Estimate room area, waste-adjusted flooring coverage, and full boxes to order for laminate, hardwood, vinyl plank, or tile flooring projects.
Open toolDeck Mud Calculator
Find how much deck mud you need from square feet and thickness. Returns mud volume plus sand and Portland cement bags using the 5-to-1 floor mud recipe.
Open toolBoard Foot Calculator
Calculate board feet from thickness, width, and length, plus total cost per board foot. Includes a chart of board feet for common lumber sizes like 2x6x8.
Open toolStair Calculator
Calculate how many steps you need, adjusted riser height, total run, stair angle, and stringer length. Enter your floor-to-floor height and target riser dimensions.
Open toolDrywall Calculator
Calculate how many drywall sheets you need for any room. Enter wall length, height, and openings to get an accurate sheet count with waste allowance.
Open toolFence Calculator
Calculate how many posts, rails, and pickets you need for a wood fence. Enter fence length, height, and spacing to get a full materials list.
Open toolGrass Seed Calculator
Calculate how many pounds and bags of grass seed your lawn needs. Covers new seeding and overseeding rates with a built-in waste allowance.
Open toolStud Calculator
Calculate how many wall studs you need for any wall length at 16 or 24 inch on-center spacing. Includes extras for corners and openings, plus plate lumber totals.
Open toolRoofing Calculator
Estimate roof area, roofing squares, and shingle bundles for any roof size and pitch. Adds a waste factor and an optional shingle cost so you can order the right amount.
Open toolBrick Calculator
Estimate how many bricks you need for a wall from its length, height, and brick size. Adds a waste factor and an optional cost per brick so you can order with confidence.
Open toolSubfloor Calculator
Calculate how many sheets of plywood or OSB subfloor you need for any room. Enter the room size and sheet size to get a sheet count with waste included.
Open toolInsulation Calculator
Calculate how many bags or rolls of insulation you need for an attic, wall, or floor. Enter the area and the coverage per bag to get a bag count with waste.
Open toolPaver Calculator
Calculate how many pavers you need for a patio or walkway from your area and paver size, with a waste allowance for cuts and breakage.
Open toolRoof Pitch Calculator
Convert roof rise and run into pitch per 12, slope percent, and roof angle in degrees. Use it for quick framing and roofing layout checks.
Open toolFraming Calculator
Estimate studs, plates, and total linear feet for a wall or simple rectangular room. Enter wall size, height, spacing, and openings for a fast framing takeoff.
Open toolPipe Volume Calculator
Calculate pipe volume from inside diameter and pipe length. Get internal volume in cubic feet, US gallons, and liters for plumbing, irrigation, and water storage runs.
Open toolRiver Rock Calculator
Estimate cubic yards, tons, and bag count for river rock from area, depth, density, and waste. Useful for planting beds, borders, dry creek beds, and drainage areas.
Open toolSand Calculator
Estimate cubic feet, cubic yards, tons, and bag count for sand from area and depth. Includes dry-sand density assumptions for patios, pavers, and sandbox fills.
Open toolRebar Calculator
Estimate rebar count and total linear feet for a simple slab grid. Enter slab length, width, spacing, and optional waste to get bars each way.
Open toolSonotube Concrete Calculator
Estimate sonotube concrete volume and bag counts from tube diameter, hole depth, and number of holes. Includes 40, 50, 60, and 80 lb bag options for deck footing pours.
Open toolSquare Meter Calculator
Calculate square meters from room length and width in meters, then see the same area in square feet for flooring, paint, and material planning.
Open toolPipe Weight Calculator
Estimate pipe weight from outside diameter, wall thickness, length, and material density. Get total pipe weight in pounds and kilograms plus linear weight for steel and other materials.
Open toolRamp Slope Calculator
Convert ramp rise and run into slope ratio, percent grade, and angle. Includes a clear 1:12 ADA-style planning reference note for early layout checks.
Open toolRoof Shingle Calculator
Estimate roofing squares and shingle bundles from measured roof area or simple roof dimensions. Add optional waste to plan a more realistic asphalt shingle order.
Open toolCFM Calculator
Estimate room airflow in CFM from length, width, ceiling height, and air changes per hour. Works in feet or meters and shows room volume in ft3 and m3.
Open toolElevation Grade Calculator
Convert rise and run into percent grade, slope ratio, and angle for site work and driveways. A 2-foot rise over 40 feet is a 5% grade.
Open toolSquare Yards Calculator
Calculate square yards from length and width in yards, then see the same area in square feet for turf, flooring, and material planning.
Open toolAsphalt Calculator
Estimate tons of asphalt from square footage, thickness, and asphalt density. Uses 145 lb/ft3 as a common planning default for driveway and paving jobs.
Open toolBeam Deflection Calculator
Calculate beam deflection for a simply supported beam under a center point load. Enter load, span length, modulus of elasticity, and moment of inertia.
Open toolRafter Length Calculator
Calculate common rafter length from horizontal run and roof pitch per 12. Add an eave overhang and get the result in inches, feet, and feet and inches.
Open toolRetaining Wall Calculator
Estimate how many retaining wall blocks you need from wall length, height, and block size. Includes a buried base course, cap row, and waste factor for accurate ordering.
Open toolConcrete Block Calculator
Estimate how many standard 8x8x16 concrete blocks you need for a wall from its length and height. Adds a waste factor and an optional cost per block so you can order with confidence.
Open toolFuel Consumption Calculator
Convert MPG to L/100km and L/100km to MPG instantly. A trip of 650 km on 45 liters is 6.92 L/100 km, about 34 MPG. Handles US and UK MPG plus km/L.
Open toolAquarium Volume Calculator
Calculate aquarium volume from tank dimensions. A 36 x 18 x 16 inch tank holds about 44.9 US gallons and its water alone weighs about 374 lb.
Open toolDilution Ratio Calculator
Work out how much concentrate and water a dilution ratio needs. A 1:10 ratio in a 32 oz bottle takes 2.9 oz of concentrate and 29.1 oz of water.
Open toolGear Ratio Calculator
Calculate gear ratio from tooth counts. A 20-tooth gear driving a 60-tooth gear gives a 3:1 ratio, cutting speed to a third and tripling torque.
Open toolTV Mounting Height Calculator
Find the right TV mounting height for your wall using screen size and seated eye level. Get the bracket bottom, center, and top height in inches.
Open toolEngine Displacement Calculator
Calculate total engine displacement from bore, stroke, and cylinder count. Get results in cc, liters, and cubic inches with per-cylinder swept volume.
Open toolPool Salt Calculator
Find out how much salt to add to a saltwater pool. Enter your pool volume in gallons, your current salinity, and your target ppm to get pounds of salt, 40-lb bags, and kilograms.
Open toolSolar Panel Calculator
Find out how many solar panels you need from your monthly electricity use. This solar panel calculator estimates system size in kilowatts, panel count, and yearly production.
Open toolTaper Calculator
Enter a large diameter, small diameter, and length to get taper per foot, taper ratio, and included and half angle in degrees.
Open toolSquare Feet to Cubic Yards Calculator
Convert square footage and fill depth into cubic yards for concrete, gravel, soil, sand, or mulch. Enter depth in inches or feet and get an instant volume.
Open toolWater Tank Volume Calculator
Calculate water tank volume for rectangular, vertical cylindrical, and horizontal cylindrical tanks. Get total capacity in US gallons, liters, and cubic feet.
Open toolPlate Weight Calculator
Calculate the weight of a steel, stainless, aluminum, or copper plate. A 48 in x 96 in steel plate 0.25 in thick weighs about 326.7 lb. Supports inches and millimeters.
Open toolFurnace Size Calculator
Estimate the furnace size you need in BTU per hour from home square footage and climate zone. A 2000 sq ft home in a cold climate needs about 90000 to 100000 BTU.
Open toolFeatured Tools
Plate Weight Calculator
Calculate the weight of a steel, stainless, aluminum, or copper plate. A 48 in x 96 in steel plate 0.25 in thick weighs about 326.7 lb. Supports inches and millimeters.
FeaturedFurnace Size Calculator
Estimate the furnace size you need in BTU per hour from home square footage and climate zone. A 2000 sq ft home in a cold climate needs about 90000 to 100000 BTU.
FeaturedWater Tank Volume Calculator
Calculate water tank volume for rectangular, vertical cylindrical, and horizontal cylindrical tanks. Get total capacity in US gallons, liters, and cubic feet.
Grouped by Topic
Construction math needs practical guardrails because real materials are sold in bags, boards, boxes, sheets, rolls, bundles, and truckloads rather than perfect decimals. Coverage rates vary by product. Thickness changes volume. Waste factors depend on layout, cuts, breakage, and installation method. Nominal lumber sizes differ from actual dimensions. Concrete yield can vary by mix and site conditions. Use these calculators to get a strong estimate fast, then compare the output with product packaging, supplier minimums, local code requirements, and a sensible waste allowance before you place the order.
Planned Next Tools
Frequently Asked Questions
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Related Guides
Bags of Concrete by Project: From Fence Posts to 20x20 Slabs
Reference chart of concrete bag counts for common home projects. Fence posts, mailbox bases, pads, slabs, and footings at 40, 60, and 80 lb bag sizes, plus when to switch to ready-mix.
How to Calculate Square Footage Correctly
Step-by-step square footage method for rooms, mixed shapes, and material-planning estimates.