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.
Circle skirt calculator
A full circle skirt for a 28-inch waist and a 22-inch length needs a waist radius of about 4.46 inches and just under 53 inches of fabric.
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Clock duration calculator
From 09:30 to 14:45 is 5 hours 15 minutes, and a night shift from 22:15 to 06:40 wraps past midnight correctly.
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CM to ring size converter
A finger that measures 5.45 cm around is a US size 7, a UK N½ and an EU 54.5. Enter the circumference in centimetres and get all three sizes plus the inside…
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Cord wood calculator
A stack 8 feet long, 4 feet high and 4 feet deep is exactly one cord, 128 cubic feet of wood and air.
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Cost per mile calculator
With fuel at 3.5 a gallon and a car that does 28 miles per gallon, each mile costs 0.125 in fuel. Enter the fuel price, your efficiency and, if you like, a…
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Count hours calculator
From 10:00 PM to 6:00 AM is 8 hours: type two clock times and get the hours between them, even when the span crosses midnight.
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Crosswind component
A 20-knot wind from 240 degrees on runway 18 splits into 10 knots of headwind and about 17.3 knots of crosswind from the right.
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Curtain size calculator
A 60 by 80 window at fullness 2, with side hems of 3 and header and bottom hems of 8, needs a piece of fabric 126 wide and 96 long.
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Mobile data usage calculator
On a 10240 MB plan, streaming, maps, social apps and email totalling 3470 MB leave 6770 MB, about 33.9% used.
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Date of birth calculator
Someone who is 30 on 20 March 2026 was born on 20 March 1996 at the latest and no earlier than 21 March 1995.
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Date to date calculator
From 15 January 2020 to 25 July 2026 is 6 years, 6 months and 10 days. Enter two dates and get the completed years, leftover months and leftover days between…
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Days until calculator
From 25 July 2026 there are 153 days left until 25 December 2026. Enter the day to count from and the date you are waiting for, and get the whole calendar days…
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Days until December
From 25 July 2026 there are 129 days until 1 December. Enter any date and get the full days left until the next first of December, which moves to the following…
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Decimal time conversion
Seven and a half hours on a timesheet is 7:30:00, and 1 hour 15 minutes is 1.25 decimal hours. Convert any duration either way between decimal hours and hours…
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Diaper calculator
A one-month-old changed 10 times a day needs 81 diapers for a week, once a 15% spare for leaks is added and the total is rounded up.
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Drive time calculator
180 kilometres at an average of 90 km/h is 2 hours behind the wheel; add a half-hour lunch and the whole trip takes 2 hours 30 minutes.
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Elapsed time calculator
From 09:30 on 10 March 2024 to 14:45:30 on 12 March 2024, 2 days, 5 hours, 15 minutes and 30 seconds passed.
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English learning calculator
Climbing from A1 to B1 at 200 hours per level and 30 minutes a day means 400 study hours, or 800 days.
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EU to US shoe size converter
A men's US 9 is an EU 42, or 41.91 exactly, both matching a last of 27.94 cm. Enter an adult size, pick the direction and men's or women's sizing, and get the…
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Flight radiation calculator
An 8-hour flight at an average of 4 microsieverts per hour gives about 32 µSv, roughly 1.6 chest X-rays.
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Fuel consumption calculator
45 litres over 500 kilometres is 9 litres per 100 km. Enter the fuel you actually used and the distance you drove on a trip to get the consumption rate of that…
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Garbage bag size
A kitchen can measuring 19 by 14.5 by 10.5 inches inside takes a 13-gallon kitchen bag. Measure the inside of your can, enter height, width and depth, and get…
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Gas calculator
A 400-mile trip in a car that averages 25 miles per gallon needs 16 gallons, which at 3.2 per gallon costs 51.2.
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Glove size
A hand measuring 8.25 inches around the knuckles wears a size M, numeric 8. Enter that one measurement, thumb excluded, and get the letter to order and the…
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GMAT score calculator
A practice pair of 49 Quantitative and 42 Verbal estimates a classic GMAT total of 730 on the 200 to 800 scale.
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Hair growth calculator
Hair at 10 cm that grows 1.25 cm a month reaches 17.5 cm after 6 months. Enter your measured length, the months and your own average monthly growth, in…
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Hammock hang calculator
Two trees 12 feet apart with a 30-degree sag call for straps just under 3.5 feet above the hammock's lowest point.
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Helium balloons calculator
A 50-gram camera needs 4 helium balloons that lift 14 grams each, because 3 give only 42 grams and the count always rounds up.
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Hot tub cost calculator
A 5500-watt spa heater running 4 hours a day at 0.15 per kilowatt-hour uses 660 kWh and costs 99 a month.
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Hours calculator
Clock in at 09:00, clock out at 17:30, take a 30-minute lunch, and you worked exactly 8 hours. Enter the start time, end time and unpaid break minutes for one…
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Hours and minutes converter
2.5 hours on a timesheet is 2 hours and 30 minutes on the clock. Enter any decimal hour count from a payroll export or spreadsheet and get the whole hours plus…
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How old am I
Someone born on 9 March 1988 is 38 years, 4 months and 16 days old on 25 July 2026. Enter a birth date and the day you want to measure to, and get an exact age…
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Idling fuel consumption calculator
An engine burning 0.8 litres an hour uses 0.4 litres in half an hour of idling. Enter the idle rate and how long the car sat in a drive-through, a warm-up or a…
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Jeans size
A 28-inch waist and 38.5-inch hips make a US 8, EU 40, UK 12 and international S, with the hips setting the size.
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Keystrokes per hour calculator
3,000 keystrokes in 10 minutes is 300 a minute, or 18,000 keystrokes per hour. Enter the key count from your typing log and the elapsed minutes of the same…
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Linear inches calculator
A 22 × 14 × 9 inch carry-on adds up to 45 linear inches, exactly the common US cabin limit. Enter length, width and height in inches or centimetres, add your…
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Louise Gluck poetry stats
Two lines, “The night is still.” and “A moth finds the lamp.”, measure 2 verse lines, 9 words and 9 estimated syllables in one stanza.
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Microwave wattage
If one US cup of water reaches a rolling boil in 120 seconds on high, your microwave delivers about 1000 cooking watts.
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Hours to minutes converter
2.5 hours is 150 minutes: one total, not hours plus leftover minutes. Enter any hour count from a timesheet, a recipe or a parking stay, whole or fractional…
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Month counter
From January 2020 to June 2024 there are 53 whole months. Enter just the year and month of each date, with no day needed, and get the month count for a lease, a…
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Money weight calculator
Ten one-dollar bills, five twenties and two hundreds weigh 17 grams, because every US note weighs one gram.
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Nautical mile converter
One nautical mile is exactly 1852 metres, 1.852 kilometres and 1.150779448024 statute miles. Enter any distance in nautical miles from a chart, a flight…
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Number of days between dates
From 1 to 11 January 2024 there are 10 nights between the dates, or 11 days if the first and the last day both count.
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Paper thickness calculator
A stack of 500 sheets that measures 50 mm means each sheet is 0.1 mm thick, or 100 micrometres. Measure a ream, enter the count and read the caliper in…
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Paper weight calculator
500 A4 sheets at 80 gsm weigh 2.4948 kg, the familiar ream on every print order. Enter any sheet count, size and grammage to know the paper weight before…
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Podcast backlog calculator
40 unplayed episodes of 55 minutes at 1.25 times speed are 1,760 minutes, a little over 29 hours of listening.
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Pool salt calculator
A 50,000-liter pool at 2,500 ppm that must reach 3,200 ppm has a 700 ppm gap and needs 35 kg of salt.
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Price per acre calculator
250,000 for 50 acres is 5,000 per acre. Divide any asking or offer price by the acreage to compare a ranch, a homestead or a wooded lot on the same basis…
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Price per linear foot calculator
A piece 12 feet 6 inches long that costs 240 is 12.5 feet, so it works out at 19.2 per linear foot.
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Quarantine books calculator
14 days of 60 minutes a day at 40 pages per hour is 560 pages, enough to finish 1 book of 300 pages with most of a second under way.
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Quilt yardage calculator
A 60 by 80 inch quilt with 12-inch blocks and a 0.25-inch seam needs 30 blocks cut at 12.5 inches, just under three and a half yards of 42-inch fabric.
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Reading speed calculator
Read 2000 words in 10 minutes and your speed is 200 words per minute, so an 80000-word novel takes you 400 minutes.
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Retirement countdown
At 42.5 with retirement planned at 67, you have 24 years and 6 months to go. Enter your current age and your target age to see the remaining time as years…
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RPM calculator
At 100 km/h a 0.632 m tire turns 839.424805 times a minute; multiply by the gear ratio to get engine speed.
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SAT score calculator
A 720 in Reading and Writing plus a 750 in Math gives a combined SAT total of 1470 out of 1600. Each section is checked against the official 200 to 800 range…
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Shower cost calculator
A 10-minute shower at 8 liters per minute uses 80 liters; at 0.005 per liter plus 0.4 for heating, it costs 0.8 in total.
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Silver lining calculator
10.49 grams of silver spread over 100 square centimetres at a density of 10.49 makes a lining 100 micrometres thick, about 3.937 mils.
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Social media time alternatives
Two hours a day on social apps is 14 hours a week and 730 hours a year, time for about 122 six-hour novels or 973 workouts.
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Sock loss index calculator
Ten pairs bought and 14 single socks left after 12 months means 6 of 20 socks are gone: 30% in total, a sock loss index of 2.5% per month.
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Standing desk height calculator
At 175 cm tall and typing, set the desk surface to 107.8 cm and the monitor centre to 155.75 cm, with the top of the screen at eye level, 163.8 cm.
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