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➗ MathFree
Volume of a triangular prism
Find a triangular prism's volume from three measurements: a triangle with base 3 and height 4, stretched over a length of 10, gives a base area of 6 and a…
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Width of a rectangle calculator
Divide the area by the known length to get the width: a rectangle with an area of 40 and a length of 8 is 5 wide.
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Y-intercept calculator
Give a slope and a point, or two points, and get the spot where the line crosses the vertical axis: slope 2 through the point (3, 7) crosses at 1.
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Add time calculator
Add two durations in hours, minutes and seconds with the carries done for you: 1:45:40 plus 2:30:35 is 4:16:15, because extra minutes and seconds roll over at…
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Add hours to a time
Add hours to a time of day and get the new clock time plus the number of midnights crossed: 14:30 plus 5 hours is 19:30 the same day.
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Age calculator
Find someone's age in completed years between two dates: a person born on 1990-05-15 is 36 on 2026-07-25, because the birthday has already passed that year.
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Age in hours calculator
Turn an age in years into hours with one clear rule: each year counts as 365.25 days of 24 hours, so 1 year is 8,766 hours and 25 years is 219,150 hours.
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Age in seconds calculator
Find out how many seconds an age adds up to: each year counts as 365.25 days, so 25 years is 788,940,000 seconds.
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Age in years, months and days
Get a person's exact age as years, months and days: someone born on 1990-05-15 is 34 years, 3 months and 5 days old on 2024-08-20.
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Days until birthday
See how many days remain until the next birthday: for someone born on 1990-05-15, there are 294 days left on 2026-07-25, counting to the next birthday on…
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Appliance wattage calculator
See what an appliance really uses: a 1,500-watt heater run for 3 hours a day takes 4.5 kWh, and that energy times your price per kilowatt-hour is the daily…
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Baby age calculator
See your baby's age the way clinics count it: a baby born on 2025-01-15 is 79 weeks and 3 days old on 2026-07-25, which is also 18 months and 10 days.
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Balloon arch calculator
A 12-foot arch at 8 balloons per foot needs 96 balloons. Enter the arch length in feet and the density you want, and get a whole number to buy, rounded up so…
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Bathroom mirror size
A 36 × 34 inch vanity gets a mirror about 33.12 inches wide and 32.98 inches tall. Enter the vanity width and height in one unit, inches or centimetres, and get…
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Beauty product lasts calculator
A 50 ml serum used at 0.5 ml a day lasts 100 days, a little over three months. Enter the container size and your daily amount in the same unit, from millilitres…
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Bed size calculator
A 160 × 200 cm mattress covers 3.2 m² of floor, is labelled queen and sleeps two. Enter width and length in centimetres, metres, inches or feet to get the floor…
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Binge-watching calculator
Ten 45-minute episodes at 1.5× speed take 5 hours, a little over a fifth of a day. Enter the episodes left, how long each one runs and your playback speed to…
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Birth year calculator
Someone who is 35 in 2026 and has already had their birthday was born in 1991; before the birthday, one year earlier.
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Birthday weekday calculator
Someone born on 25 July 1990 has their 2026 birthday on a Saturday. Enter your birth date and the year you are planning to see which weekday the anniversary…
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Bold text
Type Hello world and get **Hello world**, ready to paste wherever Markdown bold is read, from chat apps to project notes.
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Bra size calculator
An 80 cm underbust with a 94 cm bust is a US 32DDD, a UK 32E and a European 80B. Enter both tape readings in centimetres or inches to get band and cup in all…
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Brake-specific fuel consumption calculator
An engine burning 10 kg of fuel per hour while delivering 50 kW at the shaft has a BSFC of 200 g/kWh.
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Calendar countdown
From 25 July 2026 to Christmas 2026 there are 153 days left. Enter today's date and the event date to get the signed number of calendar days: positive while it…
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Chronological age calculator
Someone born on 4 July 1985 is 40 years, 8 months and 16 days old on 20 March 2026. Enter a birth date and a reference date to get the calendar age that…
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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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3
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