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.
Cat age calculator
A 1-year-old cat is about 15 in human years and a 2-year-old about 24; after that, each cat year adds 4.
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Dog age calculator
Turn your dog's age into human years on a curve set by its size, where a one-year-old medium dog is 15 and each year after the second adds 4 for small dogs and…
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Metronome subdivision calculator
At 120 BPM a beat lasts 500 ms and each sixteenth note 125 ms, which means 8 clicks every second. Enter a tempo and a subdivision such as eighths, triplets or…
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Home circuit count calculator
A 2,000 sq ft home works out to 5 general lighting and outlet circuits at 15 A and 120 V: floor area times 3 volt-amperes per square foot, divided by what each…
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Metal roofing panel calculator
A 1,200 square foot roof with 3 by 12 foot panels and a 0.5-foot side lap gets 30 square feet of cover per sheet, so you need 40 panels.
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Sod calculator
A 1,000 sq ft lawn with 10% waste needs 1,100 sq ft of turf: 110 rolls of 10 sq ft, which is 3 pallets at 50 rolls each.
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Butter measurement converter
One US stick of butter is 8 tablespoons, half a cup, 4 ounces or 113.3980925 grams. Enter an amount in any of those five units and read all the others at once…
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Cake tin size converter
An 8-inch round tin covers the same area as a square tin with sides of about 7.09 inches. Enter a diameter or a side in inches or centimeters and get the…
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Honey cups to grams converter
One US cup of honey weighs about 336 g and holds 16 tablespoons, because honey is set at 1.42 g per milliliter.
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Pints to liters converter
One US pint is 0.473176473 L and one UK pint is 0.56826125 L, about 20% more: choose the pint your recipe or menu means and convert to liters or back.
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Teaspoons to ml converter
One US teaspoon is 4.92892159375 ml, about 4.93, while a metric teaspoon is exactly 5 ml, so 3 metric teaspoons make 15 ml.
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Guitar capo key calculator
Chord shapes G, Em, C and D with a capo on fret 2 sound as A, F#m, D and E, in the key of A. Enter your shapes and the fret to get the real chords for piano…
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Crochet yarn estimator
A 40 by 50 piece at 4 stitches and 3.5 rows per unit, using 0.02 of yarn per stitch, needs 28000 stitches and 560 units of yarn.
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Dice probability calculator
Two six-sided dice add up to 7 in 6 of 36 outcomes, a chance of exactly 1/6. Enter how many dice, how many sides and the sum you need, and get the exact odds…
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Flash guide number calculator
A guide number of 36 at ISO 100 and a subject 4.5 metres away calls for f/8. Choose whether to solve for aperture or distance, set your ISO and get the…
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Frequency to note calculator
440 Hz is A4 with 0 cents, while 445 Hz is still A4 but a few cents sharp. Enter a measured tone and see the closest named pitch, its MIDI number and how far…
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Hyperfocal distance calculator
A 50 mm lens at f/8 with a 0.03 mm circle of confusion has a hyperfocal distance of roughly ten and a half metres: focus there and everything from half that…
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Line height calculator
Body text at 16 px with a 1.5 ratio needs a 24 px line height. Enter any font size and ratio and get the pixel value to write into a fixed layout, a design spec…
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500 rule calculator
With a 24 mm lens on full frame, the 500 rule allows about 20.8 seconds before stars trail, and a 50 mm lens on a 1.5 crop body about 6.7: enter focal length…
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Baseboard trim calculator
A 40-foot room perimeter with 6 feet of doorways and 8-foot sticks needs 5 pieces of baseboard. Enter the perimeter, the openings and the stock length, and…
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Brick calculator
623 bricks is the order for a 10 m² wall in 215 by 65 mm bricks with 10 mm joints and the default 5 percent waste.
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Drywall sheet calculator
40 m² of wall and 20 m² of ceiling in 2.4 × 1.2 m sheets, with 10% waste, need 23 sheets and 736 screws at 32 per sheet.
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Fence picket calculator
A 100-inch run with 3.5-inch pickets and 3.5-inch gaps takes 15 pickets, laid out picket, gap, picket and ending on a board, so you never under-order.
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Grass seed calculator
A 5,000-square-foot lawn seeded at 5 pounds per 1,000 square feet needs 25 pounds of seed. Turn the rate on the bag into seed per square foot, multiply by your…
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Mulch calculator
A 200 square foot bed mulched 3 inches deep takes 50 cubic feet, or 1.8519 cubic yards for a bulk order, which is 25 bags of the common 2 cubic foot size.
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Paint quantity calculator
Painting 48 m² of wall with 2 coats at 10 m² per litre takes 9.6 litres, so you buy 10. Enter the wall area or the room's length, width and height, subtract…
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Rafter length calculator
A 24 ft span at a 6/12 pitch with a 1.5 ft overhang needs a common rafter about 14.9 ft long, 13.4164 from ridge to plate plus the tail.
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Retaining wall block calculator
A 10 m wall 1.2 m high, built with 0.4 by 0.2 m blocks, takes 6 courses of 25 blocks, 150 in all. Enter the run, the finished height and the block face in one…
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Tile grout calculator
300 mm square tiles with 3 mm joints, 8 mm deep, over 10 m² take 2.5221 kg of grout, or 3 kg rounded up for buying.
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Room wall area calculator
A 5 by 4 m room with 2.4 m walls has 43.2 m² of wall; take away 4.5 m² of doors and windows and 38.7 m² is left to paint or paper.
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Cost per day calculator
A yearly price of 365 works out to 1 a day, and 1,200 a year to 100 a month. Enter any annual cost, from insurance to a membership, and see it as a daily…
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Cost per use calculator
A coat that cost 120 and gets worn 40 times costs 3 per wear. Divide any price by its expected uses to compare items with different price tags and lifespans on…
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Emergency fund calculator
Essential bills of 3000 a month covered for 6 months make an emergency fund target of 18000. Enter what you must still pay each month if income stops and how…
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Hourly to salary converter
At 25 an hour, 40 hours a week for 52 weeks, you earn 52,000 a year and 1,000 a week. Enter your wage, weekly hours and weeks worked to compare an hourly job…
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Reverse sales tax calculator
A receipt total of 108 at an 8% rate splits into 100 before tax and 8 of tax. Enter any tax-inclusive total and the rate in percent to back out the net amount…
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Rule of 72 calculator
At 8% a year your money doubles in about 9 years, because 72 divided by 8 is 9. Enter an annual growth rate in percent for a quick doubling estimate before you…
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Round-robin matches calculator
Plan a league where everyone meets once: 8 teams need 28 games over 7 rounds with 4 games per round, while 5 teams need 10 games over 5 rounds.
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Cups to grams converter
Two cups of all-purpose flour weigh 240 g, because flour is listed at 120 g per cup. Choose the ingredient, enter the cups, even as a fraction, and get the…
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Fluid ounces to ml converter
Eight US fluid ounces are 236.5882365 ml, while one imperial fluid ounce is 28.4130625 ml, about 4% smaller than the US one.
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Flour cups to grams converter
Two cups of all-purpose flour weigh 240 g, but bread and cake flour do not: each type has its own density of 120, 127 or 114 g per cup.
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Gas mark converter
Gas Mark 4 is 180 °C or 350 °F on the standard British oven table. Enter any mark from a quarter to nine, or a listed temperature with its scale, and get the…
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Grams to cups converter
250 g of all-purpose flour is 2 US cups, because flour is set at 125 g per cup. Enter the grams and pick the ingredient, from sugar and butter to honey or oats…
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mL to cups converter
A cup is 236.588 mL in the US, 250 mL in metric recipes and 284.131 mL in older British cookbooks: pick the one your recipe means and convert millilitres to…
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Oven temperature converter
180 °C is 356 °F, a moderate oven and gas mark 4: enter a Celsius or Fahrenheit number, or a phrase such as hot oven, and see every form at once.
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Cooking ounces to grams converter
One weight ounce is exactly 28.349523125 g, so 8 oz of chocolate is 226.796185 g: convert ounces to grams or back for recipes, prep sheets and dual-unit cards.
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Quarts to liters converter
A US quart is 0.946352946 L and an imperial quart 1.1365225 L, nearly a fifth more: choose the quart your recipe uses and convert to liters or back without…
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Recipe scaler
Multiply every line of an ingredient list by the same number: doubling 250 g of flour, 100 g of sugar, 2 eggs and 1 teaspoon of salt gives 500, 200, 4 and 2…
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Rice cups to grams converter
One cup of raw white rice weighs 185 g and one cup of cooked rice 158 g, so this converter asks which one you have before turning cups into grams or grams back…
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Sugar cups to grams converter
One cup of granulated sugar is 200 grams, packed brown sugar 220 and powdered sugar 120. Pick the sugar, enter cups or grams, and get the other measure for your…
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Tablespoons to ml converter
Two US tablespoons are 29.5735295625 ml, while a metric tablespoon holds 15 ml and an Australian one 20 ml.
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US to metric cooking converter
One US cup is 236.59 ml and 8 ounces of weight are 226.80 g. Convert any line of an American recipe to milliliters, liters, grams or kilograms with one fixed…
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Yeast conversion converter
7 g of active dry yeast equals 5.25 g of instant or 21 g of fresh yeast. Enter the amount and kind your recipe calls for and get all three equivalents in the…
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BPM to milliseconds calculator
At 120 BPM a quarter note lasts 500 ms and a dotted eighth 375 ms: enter your tempo and get every note length and delay time, from whole notes to…
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Cents between frequencies calculator
From 440 Hz to 880 Hz is 1200 cents, exactly one octave with a ratio of 2. Enter any two frequencies to get the signed interval in cents and check a tuning, a…
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Chord note calculator
C major gives C, E and G, labeled P1, M3 and P5. Enter a root and a quality such as maj7, sus4 or m7b5 to see every tone with its interval name and half-step…
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Crop factor calculator
A 50 mm lens on a 1.5 crop body frames like 75 mm on full frame, and its f/1.8 compares as f/2.7 for depth of field.
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Depth of field calculator
A 50 mm lens at f/2.8 focused at 5 m keeps things sharp from just over 4 m to almost 6 m. See near limit, far limit, total zone and hyperfocal distance before…
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Equivalent exposure calculator
Stopping down from f/4 to f/8 at 1/125 and ISO 100 means a shutter of 0.032 s to keep the same light.
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Exposure value calculator
f/2.8 at 1/60 s and ISO 100 is about EV 8.878. Each whole EV step is one stop of light, so two setups can be compared at a glance without juggling three…
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Camera field of view calculator
A 50 mm lens on a 36 by 24 mm full-frame sensor covers just under forty degrees across and nearly forty-seven on the diagonal.
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