- Construction Calculator
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Plywood CalculatorCalculate how many plywood sheets you need for a wall, floor or roof. Enter surface size, sheet size and waste % for an instant material and cost estimate.
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Paver Sand CalculatorCalculate how much bedding sand you need for a paver patio or walkway. Enter area and sand depth to get cubic yards, cubic feet, and weight.
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Paint CalculatorFree paint calculator: enter wall area, doors/windows, coats and coverage to find how many gallons of paint you need for any room.
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Ladder Angle CalculatorCalculate the angle of a ladder against a wall from its height and base distance. Check the safe 75-degree (4-to-1) setup and required ladder length.
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Hoop House CalculatorCalculate the arc length of a semicircular hoop and the total cover material (sq ft) needed for your hoop house or high tunnel by width and length.
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Heat Loss CalculatorCalculate heat loss through walls, roofs and windows from surface area, U-value and the inside–outside temperature difference. Get watts and daily kWh.
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Furnace Size CalculatorEstimate the BTU furnace size you need by home square footage and climate zone. Quick heating capacity calculator for US/Canada homes.
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Floor Area Ratio (FAR) CalculatorCalculate Floor Area Ratio (FAR) instantly. Divide total building floor area by lot area to check zoning density limits for any project.
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Flooring CalculatorCalculate how many boxes of flooring you need. Enter room dimensions, coverage per box, and waste allowance to get area and box count instantly.
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Fence Post Depth CalculatorCalculate how deep to bury a fence post using the 1/3 rule of thumb. Enter total post height and get the recommended hole depth in feet.
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Epoxy CalculatorCalculate how much epoxy resin you need for a surface by length, width, thickness and number of coats. Get gallons, fluid ounces and liters instantly.
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Fence CalculatorFree fence calculator: enter your fence length and post spacing to estimate the number of posts, sections (panels), and rails needed for your project.
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Deck Stain CalculatorCalculate how many gallons of deck stain you need. Enter deck length, width, coats, and coverage to get exact and rounded-up gallons to buy.
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Rectangle Fence Perimeter CalculatorCalculate the perimeter of a rectangular fence from its length and width. Find total fencing footage and enclosed area instantly.
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Clearance Hole CalculatorCalculate the clearance hole diameter for any bolt size by adding a fit-class allowance to the nominal diameter. Close, normal and loose fits supported.
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Carpet CalculatorCalculate how much carpet you need in square feet and square yards, add a waste allowance, and estimate total carpet cost by room size.
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Arch CalculatorFree Arch Calculator: enter span and rise to find the radius, diameter, arc length and central angle of a circular (segmental) arch.
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Boiler Size CalculatorCalculate the right boiler size for your home in BTU and kW based on floor area and climate zone. Free, fast heating output estimator.
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Air Conditioner BTU CalculatorFind the right air conditioner BTU size for any room. Enter area, occupants, and sun exposure to get a cooling capacity estimate in BTU and tons.
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AC Tonnage CalculatorCalculate the air conditioner tonnage you need from room area and BTU per sq ft. Find the right AC size and cooling capacity in BTU/hr instantly.
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Air Changes per Hour CalculatorCalculate air changes per hour (ACH) from airflow in CFM and room dimensions. Free ventilation calculator for HVAC, IAQ, and clean-room design.
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Thinset CalculatorCalculate how many bags of thinset mortar you need for tiling. Enter tile area and trowel size to get bag count with waste overage included.
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Mortar CalculatorEstimate how many bags of mortar you need for a brick or block wall. Enter block count, mortar per block, bag yield and waste allowance.
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Grout CalculatorEstimate how much grout you need for a tiling project from tile size, joint width, thickness and total area. Get volume in cubic inches, cubic feet and pounds.
