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Wallpaper Rolls CalculatorCalculate how many wallpaper rolls you need for a room from perimeter, wall height, roll size and pattern repeat. Free, accurate, with rounding for waste.
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Wallpaper Rolls for a Rectangular Wall CalculatorCalculate how many wallpaper rolls you need for a rectangular wall. Enter wall and roll dimensions to get the number of rolls, rounded up.
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Rectangular Plate Weight CalculatorCalculate the weight of a rectangular metal plate or sheet from its length, width, thickness, and material density. Get kg, grams, and pounds instantly.
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R-Value & U-Value Insulation CalculatorCalculate the R-value (thermal resistance) and U-value of insulation from material thickness and thermal conductivity. Add extra layers for total R.
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Construction Loan CalculatorEstimate interest paid during construction on a draw-based loan. Enter loan amount, rate, and term to see total interest-only cost over the build.
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Yards of Concrete for a Slab CalculatorCalculate how many cubic yards of concrete you need for a slab from length, width, and thickness, plus an optional waste allowance.
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Duct Velocity CalculatorCalculate air velocity (fpm) in round or rectangular HVAC ducts from CFM and duct size. Free duct velocity calculator with area and m/s output.
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CFM Airflow CalculatorCalculate the CFM airflow needed to ventilate a room from its dimensions and air changes per hour (ACH). Free room ventilation sizing tool.
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HVAC Tonnage CalculatorEstimate the AC tonnage you need from room size and climate. Enter square feet and BTU factor to get tons and total cooling load (BTU/hr).
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Fence Posts for a Rectangular Yard CalculatorEstimate how many fence posts you need for a rectangular yard. Enter length, width, and post spacing to get the total posts, corners included.
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Rectangular Roof Area CalculatorCalculate the actual sloped surface area of a rectangular roof from its footprint length, width, and pitch angle. Get square feet and roofing squares.
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Flooring CalculatorCalculate how many boxes of flooring you need and the total cost. Enter room size, waste allowance, coverage per box, and price per box.
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Rebar Weight CalculatorCalculate steel rebar weight from bar diameter, length and quantity using the d²/162 formula. Get unit weight (kg/m), weight per bar, total kg and tonnes.
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Gravel & Aggregate CalculatorEstimate how many tons and cubic yards of gravel, sand, or crushed stone you need. Enter length, width, depth, and material density.
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Paint Coverage CalculatorEstimate how many gallons of paint you need. Enter wall length, height, openings, coats, and coverage per gallon to get gallons rounded up.
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Drywall Sheet CalculatorCalculate how many drywall sheets you need for your walls and ceilings. Enter total area, sheet size, and waste allowance for an instant estimate.
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Concrete Bag Yield CalculatorCalculate how many bags of concrete you need for a slab or footing from length, width, thickness, bag yield and a waste allowance.
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Quikrete Bags for Fence Post CalculatorCalculate how many Quikrete or concrete bags you need to set fence posts. Enter hole size, post size, and bag size for total bags and volume.
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Paint Area Calculator with Door & Window DeductionsCalculate the true paintable wall area by subtracting door and window openings from the gross wall area. Free, metric, and easy to use.
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Paint Calculator with Multiple CoatsCalculate how much paint you need for a wall with multiple coats. Enter width, height, coats, and coverage to get gallons or liters required.
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Cost per Square Foot EstimatorEstimate total project cost from area and price per square foot. Enter square footage and cost per ft² to get an instant total cost estimate.
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Bricks Needed for a Rectangular Wall CalculatorCalculate how many bricks you need for a rectangular wall from its length, height, brick face size and a waste allowance. Fast and free.
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Pavers Needed for a Rectangular Patio CalculatorCalculate how many pavers you need for a rectangular patio. Enter patio and paver dimensions plus waste to get the exact count, area, and overage.
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Decking Boards for a Rectangular Deck CalculatorCalculate how many decking boards you need for a rectangular deck based on deck size, board width, board length and the gap between boards.
