Tools › Everyday
Everyday
Handy for anyone: a calculator that keeps exact answers for very large numbers, the days between two dates, unit conversions, a world clock for finding a meeting time across time zones, and sunrise, sunset and twilight times for any place.
CalculatorWork out expressions line by line, with exact whole numbers of any size (powers, modular inverse and power, GCD, primes and factors) or ordinary decimals with maths functions.
Unit ConverterType a value in one unit and see it in every other unit of its kind: data size (decimal and binary), data rate, time, length, mass, temperature, area, volume, speed, angle, pressure and energy; how long a file takes to transfer at a given speed; and percentages between two numbers.
Date CalculatorThe days, weeks, months and business days between two dates (also as exact years, months and days, such as an age), a date plus or minus a number of days, weeks, months, years or business days, the day of the year and days left for a date, and every ISO week of a year with its Monday and Sunday.
World ClockPlaces side by side with the hours of the day lined up, so you can pick a meeting time that suits everyone, with working hours shaded and daylight saving handled for the date you choose. Copy the chosen time as text or a picture for an email, or add it to a calendar.
Break TimerA big countdown for breaks in workshops and meetings, showing when everyone is due back and growing more urgent as the time runs out, then counting how late it is. Also an interval timer for training rounds, and a stopwatch.
Keep AwakeStop this device's screen dimming, sleeping or locking while this page is open, for as long as you need or for a set time. Handy for presenting, following a recipe or watching a dashboard.
Aspect RatioFind the aspect ratio of a width and height (reduced, with the nearest common ratio such as 16:9 or 4:3), work out the missing side from a ratio and one side, and see the sizes at common widths.
Loan CalculatorWork out the regular payment, total interest and a payment-by-payment amortisation table for a loan, with an optional extra payment to see how much sooner it ends and how much interest it saves.
Bingo CardsMake printable bingo cards: 75-ball (5 × 5 with a free centre), UK 90-ball tickets, or cards from your own words. A caller draws numbers or words at random without repeats.
Lunar PhasesSee the Moon's phase, how much of it is lit and its age for any date and time, with the next new and full moons, and a list of every new, quarter and full moon in a month.
Sun TimesSunrise, sunset, solar noon, dawn and dusk (civil, nautical and astronomical twilight) and golden hour for a city or any latitude and longitude on a date, with the day’s length and sunrise and sunset on the first of every month.
Periodic TableA periodic table you can search and move around with the keyboard, coloured by category, block or a property such as density, with each element's facts, and a molar mass calculator for formulas such as H2SO4 and CuSO4·5H2O.
Guides
Arranging a meeting across time zonesFind an hour that suits everyone, share it when you don't use the same calendar system, avoid the weeks the clocks change on different dates, and work out why an invitation shows the wrong time.
Planning a photo shoot or a night of stargazingPick the place and the day, then the hour: golden hour and twilight for photographs, the darkest hours and a moonless night for the stars, for a town or a spot on a map.
Keeping a workshop day on timeRun a workshop or training day that starts and restarts on time: send times that suit remote attendees, put a link to the materials on screen, keep the screen awake, and show a break countdown everyone can see.