Engineering & construction
517 engineering and construction calculators: electrical circuits, mechanics, materials, structures and building quantities. Results with the formula and units in view, so you can check a design before you build it, free in your browser.
Fire flow calculator
A 10,000 square foot wood-frame building needs about 2750 gallons per minute of fire flow. Enter the floor area and how the building is built to get the…
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Wall framing calculator
A 10 foot wall, 8 feet high, with studs 16 inches on center and one door takes 11 studs and 3 plates, 14 pieces in all.
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French drain calculator
A 50 foot French drain trench 1 foot wide and 2 feet deep takes about 3.7037 cubic yards of gravel and 50 feet of pipe.
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Square feet to cubic yards
1000 square feet covered 3 inches deep is 250 cubic feet, a little over 9 cubic yards. Enter the area you measured and the depth on the spec to order bulk…
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Glass pane weight calculator
A 36 by 24 inch pane, a quarter inch thick at 0.090 pounds per cubic inch, weighs 19.44 pounds. Enter the size and the density of your glass to plan freight…
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Gravel driveway calculator
A 50 by 12 foot driveway with 4 inches of gravel takes 7.4074 cubic yards, about 10.3704 tons at 1.4 tons per yard.
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Grout calculator
Ten square metres of 300 × 300 mm tiles with 3 mm joints filled 8 mm deep take about 1.6 litres of grout, a little over 2 kg.
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Hoop house calculator
A 48 by 12 foot hoop house with hoops every 4 feet needs 13 hoops and just over 1000 square feet of film for the tunnel and both end walls.
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Sprinkler K-factor calculator
A sprinkler flowing 22.4 gallons per minute at 16 psi has a K-factor of 5.6, the standard half-inch head.
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Limestone calculator
A 20 by 10 foot pad with a 6 inch base of crushed limestone at 95 pounds per cubic foot is 100 cubic feet and 4.75 short tons.
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Log weight calculator
A 12 inch log 8 feet long at 40 pounds per cubic foot weighs well over 100 kg, and the result gives the exact pounds and kilograms.
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Lumber calculator
Covering 16 by 10 feet with 8 foot boards 0.5 feet wide, a 0.01 foot gap and 10 % waste takes 44 boards.
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Miter angle calculator
A square 90 degree corner takes a 45 degree cut on each piece, a hexagon planter 30 degrees and an octagon frame 22.5.
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Paver sand calculator
A 200 square foot patio on a 1 inch bed of sand needs a little more than half a cubic yard of bedding sand.
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Pipe weight calculator
A steel pipe with a 100 mm outer diameter, a 5 mm wall and 6 m of length weighs about 70.3 kg. Enter the four measurements and get the mass of the wall itself…
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Plywood calculator
A 16 by 8 floor covered with 8 by 4 sheets takes exactly 4 boards. Enter the surface and your sheet size, and the count is rounded up so a leftover strip still…
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Pond volume calculator
A pond 20 ft long, 10 ft wide and 3 ft deep on average holds 600 cubic feet of water, shown in US gallons and liters too.
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Post hole concrete calculator
Eight 12-inch holes, 36 inches deep, around 4 by 4 posts need a little under six tenths of a cubic yard, because each post displaces 576 cubic inches of mix.
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Retaining wall calculator
A wall 10 m long and 1.2 m high built from 0.4 by 0.2 m blocks takes 150 wall blocks plus 20 cap units of 0.5 m: two separate order lines, each rounded up to…
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Rip-rap calculator
A 120 m² slope armored 0.45 m thick with stone at 1.65 t/m³ needs 54 m³ of layer, or 89.1 tonnes to order from the quarry.
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Road base calculator
A road section 100 ft long and 12 ft wide with 6 inches of compacted base needs 600 cubic feet, which weigh 40 tons at 1.8 tons per cubic yard.
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Roof truss calculator
A gable roof 24 wide at a 6 in 12 pitch, with trusses every 2 along a 40 ridge, needs rafters of about 13.4 from plate to ridge and 21 trusses.
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Round pen calculator
A round pen 50 across built from 12-long panels needs 14 panels, which cover 168 of length around the circle.
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Sealant calculator
A 50-foot joint a quarter inch wide and a quarter inch deep holds 37.5 cubic inches of sealant, so you buy 3 standard 10.1-ounce tubes.
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Siding calculator
A 1400 sq ft elevation with 200 sq ft of windows and doors leaves 1200 to clad: 12 squares, or 60 panels that cover 20 sq ft each.
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Snow load calculator
A 40 psf ground snow load with all three factors at 1.0 gives a 28 psf roof design load, because the roof carries 0.7 of the ground pack and 28 is above the 20…
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Sonotube calculator
Four 12-inch tubes filled 4 feet high take 21 bags of 80-pound concrete, at 0.60 cubic feet per bag.
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Spiral staircase calculator
A 3000 mm rise in a 900 mm radius with 250 mm treads gives 23 treads and a stair that turns slightly more than 360 degrees.
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Square yards calculator
A room 27 ft by 12 ft is 324 square feet, which is exactly 36 square yards, because one square yard holds 9 square feet.
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Steel weight calculator
A steel plate 2 m long, 1000 mm wide and 10 mm thick weighs 157 kg, about 346 lb, at the standard 7850 kg/m³.
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Taper calculator
A part that goes from 1 inch to 0.5 inch over 4 inches has a taper of 0.125 per inch and a half-angle of a little over three and a half degrees.
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Thread calculator
An M8 thread has a 1.25 mm pitch and needs a tap drill of about 6.8 mm for a 75 percent thread. Enter a metric or Unified size, pick the standard, and get the…
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Cooling tonnage calculator
A 400 sq ft room with an 8 ft ceiling in a temperate climate needs about 8000 BTU per hour, two thirds of a ton, so the next equipment step is a 1-ton unit.
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True position calculator
A hole measured 0.012 off in X and 0.008 off in Y has a true position of twice the hypotenuse of those two misses, the diametral value the drawing tolerance…
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Vinyl siding calculator
Four ranch walls of 40 and 30 ft at 8 ft high, minus 45 sq ft of openings and plus 10% waste, need 12 squares or 119 panels of 12.5 by 0.8 ft.
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Welding electrode calculator
A 3000 mm run of 6 mm fillet in E7018 deposits 0.4239 kg of weld metal, so you buy 0.7065 kg of rod: 23 sticks of 3.2 by 350 mm.
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Wood beam span calculator
A Douglas Fir-Larch No.2 two-by-ten at 16 inches on center under 40 psf spans a little over 16 feet, limited by deflection.
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