Home, food & hobbies
729 everyday calculators for home, cooking and free time: recipes and servings, tips and shared bills, paint and flooring, pets, games and hobbies. Quick answers to the small questions of daily life, free in your browser.
Chair rail calculator
46.2 feet of chair rail, waste included, runs around a room with a 48-foot perimeter and 6 feet of doorways; in 8-foot sticks that is 6 pieces with 1.8 feet to…
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CMU grout fill calculator
40 filled cells with 0.03 m² cores in a 2.4 m wall take 2.88 m³ of grout, or 3.024 m³ with the default 5% waste.
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Concrete countertop calculator
A 2.5 m kitchen run, 0.65 m deep and 4 cm thick, needs 0.065 m³ of mix, which rounds up to 5 bags at the default yield.
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Concrete mix ratio calculator
For 1 m³ of concrete at the classic 1:2:3 mix, batch a sixth of a cubic metre of cement, a third of sand and half of gravel.
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Concrete patio calculator
A 12 m² patio poured 10 cm thick is 1.2 m³ of concrete, 1.32 m³ with the default 10% waste, or 88 bags at the default yield.
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Concrete wall calculator
A 5 m wall, 2.4 m high and 20 cm thick, takes 2.4 m³ of concrete, or 160 bags at the default bag size.
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Concrete control joint calculator
A 40 × 30 ft slab about 4 inches thick gets joints no more than 7.992 ft apart: 8 joint lines totalling 270 linear feet.
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Deck beam span calculator
A double 2×10 Douglas Fir-Larch beam carrying 10 ft joists can span 7.515 ft between posts under 40 psf live and 10 psf dead load, with bending as the limit.
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Deck stain calculator
320 ft² of deck plus 48 ft of 3 ft railing, two coats and 10% waste at 200 ft² per gallon need 6.688 gallons, so you buy 7.
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Diagonal tile layout calculator
A 5 × 4 m room with 0.6 m square tiles and 5% breakage takes 67 tiles laid straight and 70 laid on the diagonal: 3 extra tiles.
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Downspout count calculator
120 ft of gutter draining 1800 ft² of roof needs 3 downspouts: 3 for the length at 40 ft per outlet and 3 for the area at 600 ft² each.
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Drywall tape calculator
20 sheets of 4×8 drywall with every joint finished need 264 feet of tape including 10% waste, which is 2 rolls of 250 feet.
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Drywall texture calculator
400 square feet sprayed in one coat with 10% overspray take 1.76 gallons of mixed texture, so you buy 2 gallons of ready-mix or 1 bag of dry powder.
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Duct size calculator
400 CFM at 700 FPM calls for a 12-inch round duct, the next stock size above the exact diameter, plus a rectangular equivalent at a 1.5 width-to-height ratio.
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Fascia board calculator
80 feet of eaves plus 40 feet of rakes, with 10% waste for mitres and joints, come to 132 feet of fascia, or 11 boards of 12 feet.
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Floor joist calculator
A 144-inch-wide room framed at 16 inches on center needs 10 floor joists: 9 full bays plus the one at the starting end.
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Garage floor tile calculator
A 36 m² garage floor in 0.4 m interlocking tiles with 5% waste needs 237 tiles, or 20 packs of 12.
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Hardwood flooring calculator
Solid hardwood for a 250-square-foot room comes to 14 boxes when each carton covers 20 square feet and you keep the default 10% for cuts and culls.
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Header length calculator
A 36-inch rough opening with 1.5-inch seats on both jack studs needs a 39-inch header. The calculator adds the opening and the bearing at each end into one…
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HVAC tonnage calculator
A 2,000 square foot home in climate zone 4 has a cooling load of 44,000 BTU per hour, which rounds up to a 4-ton air conditioner.
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LVL beam ply calculator
A 16-foot span carrying 400 pounds per linear foot gets a 14-inch LVL depth by rule of thumb and needs a single 1.75-inch ply under the default stresses.
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Metal roof screw calculator
A 1,200 square foot metal roof with screws every foot along battens set 2 feet apart needs 600 screws, or 660 with the default 10% extra.
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Mortar joint volume calculator
500 bricks measuring 0.19 by 0.057 by 0.09 m laid with 10 mm joints need 0.11565 cubic metres of mortar in their bed and head joints.
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Nominal to actual lumber size
A 2x4 is really 1.5 by 3.5 inches, and a 2x8 is 1.5 by 7.25. Type a board label such as 2x4, 2-by-4 or two-by-four and get the dressed thickness and width of…
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Electrical panel load calculator
A 2,000 sq ft home with the default kitchen and laundry circuits comes to 5,625 VA after demand factors, which at 240 V points to a 60 A main panel.
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Paver gravel base calculator
Square feet times inches of compacted depth, divided by 324, gives the cubic yards of crushed stone to order: a 200 sq ft patio on a 4-inch base needs just…
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Pergola lumber calculator
A 12 by 10 ft pergola with rafters every 2 ft needs 4 posts, 2 beams of 12 ft and 7 rafters of 10 ft, 13 pieces in all.
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Picture rail calculator
A room with a 48 ft perimeter and 6 ft of door openings needs 42 linear feet of picture rail. Subtract the doorways, add an allowance for miters if you want…
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Popcorn ceiling area calculator
A 20 by 12 ft ceiling needs 5.52 gallons of soak water for two passes with a 15% margin, so you have 6 ready.
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Rafter count calculator
A 40 ft ridge with rafters every 2 ft needs 42 common rafters, because there are 21 stations including both gable ends and each one takes a pair.
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Rafter overhang length calculator
A 24 in eave projection at a 6/12 pitch needs about 26.8 in of rafter tail, because the board is cut along the slope, not along the plan.
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Rebar weight calculator
120 ft of #5 bar at 1.043 lb per foot weighs 125.16 lb. Enter the bar size label, the total length from your schedule and the unit weight from your table to get…
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Roof batten calculator
A 2,000 sq ft roof plane with a 40 ft eave and battens at 16-inch centres takes 38 rows, 1,520 linear feet before waste.
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Roof dead load calculator
Architectural asphalt shingles on 7/16 OSB over 2x6 rafters at 16 inches, plus felt, come to a dead load of 5.9 psf.
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Roof pitch multiplier calculator
A 6/12 pitch has a slope multiplier of about 1.118, the factor that turns a floor plan area into the roof surface for shingles, underlayment and panels.
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Roofing felt underlayment calculator
A 2,000 sq ft roof with 10% waste needs 2,200 sq ft of underlayment, which is 5.5 rolls at 400 sq ft each, so you buy 6 and have 200 sq ft to spare.
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Spray foam insulation calculator
Reaching R-21 over 1,200 sq ft with open-cell foam rated R-3.7 per inch takes just under six inches of foam; with 10% waste that is 38 kits of 200 board feet.
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Stair headroom calculator
A 2800 mm storey climbed at 32° under a 3600 mm stairwell opening clears the 2032 mm minimum. Enter height, pitch and opening length to check the clearance at…
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Stair stringer length calculator
A flight that climbs 2800 mm over a 3500 mm run needs a stringer longer than either side: the calculator gives that exact diagonal length and the pitch angle…
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Starter strip shingle calculator
80 ft of eaves and 40 ft of rakes with 3 ft pieces and 5% waste take exactly 42 starter strips. The calculator adds both edges, applies the waste and rounds up…
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Tile spacer calculator
100 tiles laid with cross spacers need about 100 spacers, or 110 with the default 10% spare margin, because each cross serves four corners.
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TPO membrane roll calculator
A 2,500 sq ft flat roof covered with 10 by 100 ft rolls and a half-foot seam lap needs 3 whole rolls, because each roll really covers 950 sq ft.
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Trim paint calculator
120 linear feet of 3.5-inch trim with 2 coats at 400 sq ft per gallon needs 0.175 gallons, so one quart covers it.
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Vinyl plank flooring calculator
A 25 m² room with cartons covering 2 m² each and the default 10% waste needs 14 boxes of vinyl plank: 27.5 m² to cover, rounded up to whole cartons.
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Wall plate lumber calculator
48 ft of wall framed with one bottom and two top plates needs 144 linear feet of plate, 151.2 with 5% waste, which is 13 boards of 12 ft.
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Wall sheathing calculator
1,280 sq ft of exterior wall with 120 sq ft of doors and windows leaves 1,160 sq ft to cover: with 4×8 sheets and 10% waste you need 40 sheets, rounded up so…
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Wallpaper paste calculator
6 rolls at 0.5 litres of paste each, plus the usual 10% for mixing losses, need 3.3 litres, so you buy 4 packs of 1 litre.
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Water heater sizing calculator
A household of four with a 70-gallon morning peak on an electric heater needs a 50-gallon tank. Enter how many people live at home, the busiest-hour demand if…
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Wire ampacity calculator
Copper wire of 12 AWG with 75 °C insulation is rated for 25 amps. Pick the gauge, the temperature class and copper or aluminum to read the reference table value…
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Wire resistance run calculator
30 meters of 12 AWG copper wire add 0.152322331834 ohms one way, and twice that for the go-and-return loop of a single-phase circuit.
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Fixture unit demand calculator
24 FU on the flush-tank curve give a probable peak demand of 16.615167 gallons per minute, or 62.895248 litres.
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Lawn mowing area calculator
A 100 by 50 foot lawn is 5,000 square feet: with a 21-inch push mower it takes 32 passes, 3,200 feet of walking and about 12 minutes at 3 mph.
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Overseeding calculator
A 5,000 sq ft lawn overseeded at 3 lb per 1,000 sq ft needs 15 lb of seed. Enter your lawn area and the overseeding rate from the bag or an extension guide, and…
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PEX tubing calculator
Eight points of use with an average 25 ft run, each fed by a hot and a cold line, need 400 ft of PEX plus 10% waste: 440 ft in all.
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Pipe water weight calculator
A 10 m run of 50 mm pipe filled with water carries almost 20 kg, close to 2 kg on every metre. Enter the inside diameter and length to size hangers, check…
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Play sand calculator
An 8 by 8 ft sandbox filled 6 inches deep takes 32 cubic feet of play sand: 3200 lb, or 64 bags of 50 lb.
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Raised bed soil calculator
An 8 by 4 ft raised bed filled 1 ft deep takes 32 cubic feet of soil, about 0.906 cubic metres. Enter the inside length, width and fill height in feet, inches…
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Septic tank sizing calculator
A 3-bedroom home with 4 occupants needs a 1,250-gallon septic tank: the bedroom table says 1,000 gallons, but 4 people at 150 gallons a day for 2 days need…
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Solar panel count calculator
A home using 900 kWh a month with 400 W panels and 4.5 peak sun hours needs 21 panels, about an 8.4 kW system, at the default 80% efficiency.
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Sprinkler head count calculator
A 5,000 sq ft lawn with heads that each cover 300 sq ft needs 17 sprinkler heads, with 100 sq ft of spray to spare.
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