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.
Corner stud count calculator
A plan with 4 outside corners and 2 interior tees needs 16 extra studs: 12 in three-stud corners and 4 in two-stud tees.
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Deck footing count calculator
A 24 × 12 ft deck on a ledger, with posts at most 8 ft apart and beams at most 6 ft apart, needs 8 footings: 2 beam rows of 4 posts.
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Drip Edge Calculator
84 ft of eaves and 56 ft of rakes with 10% waste need 154 ft of drip edge, which means buying 16 ten-foot pieces.
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Footing concrete volume calculator
A strip footing 12 m long, 0.6 m wide and 0.3 m deep holds 2.16 m³ of concrete, or 144 premix bags at the default yield.
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Gutter Flow Capacity Calculator
A 180 m² roof under 75 mm/h of design rainfall sends 4.097 L/s to the gutter with the safety factor, so a half-round profile needs 127.2 mm and the next…
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Gutter hanger calculator
A 40-foot gutter run with hangers every 2 feet needs 21 hangers: 20 spaces plus one, so both ends are held.
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Joist hanger count calculator
12 joists hung at both ends need 24 joist hangers, while 10 joists hung only at a ledger need 10. Enter how many joists the bay has and how many ends of each…
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Lumber Weight Calculator
120 board feet of lumber is 10 cubic feet of wood, and at 35 pounds per cubic foot it weighs an estimated 350 pounds.
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Rebar Grid Calculator
A 6 by 4 m slab with bars at 200 mm centres and 50 mm edge cover needs 52 bars, 244.8 m of steel for one layer.
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Roof rainwater runoff calculator
A 120 m² asphalt-shingle roof sheds 5,100 litres, or 5.1 m³, in a 50 mm design storm once the 0.85 runoff coefficient is applied.
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Roof sheathing calculator
A 1,600 sq ft roof footprint at a 6-in-12 pitch (factor 1.118) with 10% waste needs 62 sheets of 4x8 plywood or OSB.
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Roofing Squares Calculator
1,800 sq ft of roof plan at a 1.118 pitch factor is 2,012.4 sq ft of sloped surface; with 10% waste it comes to 2,213.64 sq ft, or 23 whole squares to order.
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Shingle bundle calculator
22 squares at 3 bundles per square is 66 bundles; add 10% waste for starters, ridge, hips and cuts and you order 73 whole bundles.
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Stair stringer notch layout
Enter 180 mm of rise and 250 mm of run per step and get the notch marks for every step, the spacing between them along the stringer and the pitch angle, plus…
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Stone Veneer Calculator
A 240 sq ft wall with 18 ft of outside corners and 10% waste needs 254.1 sq ft of flat stone and 30 corner pieces of 8 in.
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Valley rafter length calculator
A 12-unit common run at a 6/12 pitch gives an 18-unit valley rafter from ridge to plate, because the valley travels on the plan diagonal, √2 times the run.
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Aggregate tonnage calculator
10 cubic metres of gravel weigh 16,800 kg, or 16.8 metric tonnes. Enter the volume in cubic metres, yards or feet, pick the material or your supplier's density…
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Concrete cost estimator
An 8 cubic yard pour under a 10-yard truck minimum gets the short-load fee added; at 10 yards or more that fee drops to zero.
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Corner bead calculator
8 outside corners at 8 ft plus 4 window returns at 5 ft come to 84 linear feet of corner bead, or 92.4 with 10% waste, which means 12 sticks of 8 ft.
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Door paint calculator
Six doors of 0.9 × 2.1 m painted on both sides with two coats cover 45.36 m², which at 10 m² per litre takes 4.54 litres.
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Polymeric sand calculator
A 40 m² patio of 200 × 100 mm pavers with 5 mm joints needs 7 bags of 20 kg polymeric sand. The joint share is worked out from the paver size, so small pavers…
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Primer calculator
Priming 1,200 sq ft at a label coverage of 300 sq ft per gallon with one coat takes exactly 4 gallons.
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Tile edge trim calculator
A backsplash whose three exposed edges add up to 11 linear feet needs 12.1 ft of trim with 10% waste, or 7 stock pieces of 2 ft.
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Tile backer board calculator
100 square feet of shower wall with 3 by 5 foot sheets and 10 percent waste takes 8 cement boards.
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Dehumidifier sizing calculator
An 850 sq ft space that is very damp calls for 18 pints per day, so look for a unit rated at 20 or more.
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Epoxy floor coating calculator
A 400 square foot slab with kits covering 250 square feet each needs 2 kits once 10% waste is added, with 60 square feet of coverage to spare.
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Flooring underlayment calculator
A 25 m² room with 10 m² rolls and the default 5% waste needs 3 rolls of underlayment, leaving 3.75 m² on the last one.
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Furnace sizing calculator
A 2,000-square-foot home at 45 BTU per square foot needs a 90,000 BTU-per-hour furnace. Enter the heated floor area and a climate factor, or pick your climate…
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Insulation batt calculator
Covering 1,200 square feet with R-38 batts that fill 64 square feet per bag takes 18.75 bags, so you buy 19 bundles and have 16 square feet to spare.
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Insulation cost estimator
Insulating 1,000 square feet to R-30 with R-15 batts takes two layers, and a 10% waste allowance brings the purchase to 2,200 square feet.
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Peel-and-stick wallpaper calculator
Covering 240 sq ft of wall with rolls of 28 sq ft each, plus 10% for pattern matching, takes 10 rolls.
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Recommended R-value calculator
In IECC climate zone 5 the recommended targets are R-49 for the attic, R-15 for walls and R-30 for floors.
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Room CFM calculator
A 2,400 cubic foot bedroom at 6 air changes per hour needs 240 CFM of supply air: volume times ACH, divided by 60.
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Window casing calculator
Four windows of 36 by 60 inches need 64 linear feet of casing, 16 feet each. Enter the opening size where the trim will run and how many identical windows you…
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Conductor ampacity derating calculator
With eight current-carrying conductors in one raceway, a 75-ampere wire falls in the 70 percent band and is derated to 52.5 amperes.
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Thermal Expansion Tank Calculator for Water Heaters
A 50-gallon water heater on 60 psi cold pressure has to absorb 0.948 gallons of expanded water, so the calculator recommends a 2-gallon tank after a 10% margin.
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Generator sizing calculator
A fridge, sump pump, LED lights and router draw 1,180 running watts; add the fridge's 1,000-watt start and the peak is 2,180 W, so with headroom you need 2,725…
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Outlet spacing calculator
A 40-foot wall line under the common 6-foot rule needs at least 4 receptacles. Enter the wall length that counts and the greatest distance allowed to an outlet…
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Pipe water velocity calculator
Two litres per second through a 25 mm bore moves water at just over 4 m/s, past the 2.5 m/s mark where home pipes turn loud and wear fast.
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Pipe water volume calculator
A 20 m run of 50 mm pipe holds about thirty-nine litres, roughly 10 US gallons. Enter the inside diameter and the length in one unit to know how much water you…
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Water pressure head calculator
A water pressure of 50 psi equals 115.332936 feet of head. Enter a gauge reading or a vertical height and get both figures, ready for pump curves, wells and…
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Fertilizer NPK Calculator
To supply 5 pounds of actual nitrogen from a 20-5-10 bag you need 25 pounds of product. Type the target and the analysis from the label, add the bag size if you…
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Landscape gravel calculator
A 200 square foot bed covered 2 inches deep takes 1.2346 cubic yards of decorative gravel, or 1.7284 short tons at the default density of 1.4 tons per cubic…
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Sod roll calculator
With 10 sq ft printed on a 2 by 5 ft roll, a 1,000 sq ft lawn plus 10% waste takes exactly 110 rolls, or 3 pallets of 50.
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Bark mulch calculator
A 240 sq ft bed covered 3 inches deep needs 60 cubic feet of bark mulch: 2.2222 cubic yards in bulk or 30 bags of 2 cubic feet.
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Fence rail calculator
12 fence sections with 3 rails each need 36 rail pieces; over a 96-foot run that is an average section of 8 feet and 288 feet of rail in all.
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Patio paver count calculator
A 25 m² patio laid with 0.2 × 0.1 m pavers and 10% cutting waste needs 1,375 pavers. Enter the area, the face size of one paver and the waste your installer…
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Plant spacing calculator
A 100 sq ft bed planted 1 ft apart on a square grid holds 100 plants, each in its own cell. Enter the usable area and the on-center spacing to get a whole-plant…
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Deck cost estimator
48 decking boards, 32 framing pieces, 5 fastener packs and 12 footings become one material total: each quantity is multiplied by its unit price and the four…
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Drywall cost estimator
24 sheets, 4 buckets of compound, 2 boxes of screws and 3 rolls of tape each get their own line cost, then add up to one material total.
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Renovation budget calculator
With the default 10% contingency, an itemized renovation subtotal grows by a tenth to cover surprises found once work begins.
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Baking powder cups to grams converter
One level US cup of baking powder weighs 230 grams. Enter any number of cups, fractions included, and get the weight in grams so biscuits, cakes and quick…
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Baking soda teaspoons to grams converter
One level US teaspoon of baking soda weighs 4.6 grams, and half a teaspoon 2.3. Enter teaspoons, fractions included, and weigh the soda for cookies, cakes or…
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Butter sticks to cups converter
Two US sticks of butter fill one cup, and half a stick is a quarter cup. Type the number of sticks your recipe uses and get the cups, based on the half-cup mark…
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Shredded cheese cups to grams converter
One US cup of shredded cheese weighs 113 grams, the same as 4 ounces. Enter whole cups, halves or any decimal and get the gram weight for your casserole, pizza…
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Recipe scale by factor calculator
250 grams of flour times 2 is 500 grams, which means adding 250 grams more. Enter one ingredient amount and your multiplier to get the scaled amount, the extra…
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Batch recipe multiplier calculator
Paste 2 cups flour, 1 cup sugar, 3 eggs, choose a multiplier of 2, and get 4 cups flour, 2 cup sugar, 6 eggs.
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Pancake batter ratio calculator
Say how many pancakes you want and get the batter: 8 medium pancakes need 120 g of flour, 240 mL of milk and 1 egg, from a classic per-pancake ratio.
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Simple syrup ratio calculator
A 200-gram batch of 1:1 simple syrup is 100 grams of sugar and 100 grams of water. Enter any sugar-to-water parts and the batch weight you want, and get both…
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Pork roast time by weight
A 4-pound pork roast needs 100 minutes, which is 1 hour 40 minutes, at 25 minutes per pound in a 350 °F oven.
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