Construction Calculators
Whether you are a professional contractor pricing a bid or a homeowner planning a weekend project, construction math can make or break your budget. Order too much concrete and you pay for material that gets dumped. Order too little and you risk a cold joint that weakens the entire pour. Our construction calculators take the guesswork out of material estimation for concrete, gravel, lumber, roofing, drywall, and more. Each tool uses industry-standard formulas with waste factors built in, so your estimates reflect real-world conditions — not textbook perfection. From slab pours and rebar layouts to roofing squares and brick counts, these calculators help you order the right amount the first time and keep your project on budget.
115 calculators available
Fence Material Estimator — Posts, Pickets & Rails
Calculate exact fence material quantities: posts, rails, pickets, and concrete bags based on your fence dimensions and spacing.
Fence Perimeter Calculator — Measure Your Property Line
Calculate the total fence perimeter for any property shape. Enter your side lengths, gate widths, and post spacing to get linear feet and post count instantly.
Fence Post Depth Calculator — Proper Hole Depth
Calculate the right fence post depth based on fence height and frost line. Get concrete volume, post length, and hole diameter estimates.
Fire Flow Calculator — Required Water Flow (GPM)
Estimate required fire flow in GPM using building dimensions and construction type. Based on the National Fire Academy formula for firefighting planning.
Floor Area Ratio Calculator — Determine Building Density
Calculate floor area ratio (FAR) from gross floor area and lot size. See if your project meets zoning limits.
Floor Joist Calculator — Span & Load Capacity
Calculate maximum floor joist span based on lumber size, spacing, live load, dead load, and wood species. Get code-based results in feet.
Flooring Calculator — Boxes, Sq Ft & Cost Estimate
Calculate how much flooring you need. Estimate boxes, square feet, and total cost based on room dimensions and waste factor.
French Drain Calculator — Gravel, Pipe & Trench Size
Calculate gravel volume, pipe length, and excavation needs for your French drain. Get accurate material estimates in cubic yards fast.
Square Feet to Cubic Yards Calculator — Ft² to Yd³
Convert square feet to cubic yards instantly. Enter area and depth to calculate volume for concrete, gravel, mulch, and landscaping projects.
Furnace Size Calculator — BTU Output for Your Home
Calculate the right furnace BTU output for your home based on square footage, climate zone, insulation quality, and ceiling height.
Gallons per Square Foot — Area & Volume
Calculate gallons per square foot for area and volume planning. Convert area and depth into gallons for irrigation, ponds, and concrete projects.
Gambrel Roof Calculator — Rafters & Dimensions
Calculate gambrel roof dimensions including rafter lengths, total height, and roof area for barns, sheds, and buildings.
Glass Weight Calculator — Estimate Glass Panel Weight
Calculate the weight of glass panels based on dimensions and thickness. Essential for construction, window installation, and DIY projects.
Gravel Calculator — Cubic Yards, Tons & Cost
Calculate how much gravel you need for driveways, pathways, drainage, and landscaping. Estimate cubic yards, tons, and cost for any gravel project.
Gravel Driveway Calculator — Tons & Coverage
Estimate how many tons of gravel you need for a driveway. Enter length, width, depth, and price per ton to calculate coverage and total material cost.
Grout Calculator — Tile Grout Volume & Coverage
Calculate grout needed for tile installation. Determine coverage area and bags required for floors, walls, and countertops.
Heat Loss Calculator — Estimate HVAC BTU Requirements
Calculate the heat loss in BTUs for your building to properly size heating systems. Free online HVAC heat loss estimator.
Hole Volume Calculator — Cubic Yards & Liters
Calculate hole volume for post holes, footings, and excavation projects. Determine cubic yards, liters, or gallons needed.