Date Calculators
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Age Calculator
Free age calculator: enter your birth date to see your exact age in years, months, days, hours and minutes, plus the countdown to your next birthday.
Business Days Calculator
Free business days calculator: count the working days between two dates, weekends excluded - useful for deadlines, delivery dates and project planning.
Add Days to Date
Start from any date and move forwards or backwards by days, weeks, months or years - with a business-day mode that skips weekends.
Date Difference Calculator
Free date difference calculator: find the exact time between two dates in years, months, days and weeks, and see how many working days fall in between.
Day of the Week Calculator
Free day of the week calculator: find out which weekday any date falls on - past or future - handy for birthdays, events and historical dates.
Hours Worked
Add start and end times for each day, subtract breaks, and get the week in hours and minutes, in decimal, and in money. Night shifts too.
Leap Year Checker
Free leap year checker: see whether any year has 366 days, why the rule works the way it does, and which leap years come next.
Pregnancy Calculator
Free pregnancy calculator: work out your due date, current week and trimester from your last menstrual period, with the estimated conception date.
Time Difference Calculator
Free time zone calculator: check the current time difference between any two cities worldwide, with daylight saving time already taken into account.
Week Number Calculator
Free ISO 8601 week number calculator: find which week of the year any date falls in, and see the first and last day of that week at a glance.
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Date Calculators