Date & Time Calculators
Ages, durations, countdowns and schedules.
Find the difference between dates, add or subtract days and times, count business days, and compute ages, countdowns and the day of the week.
Age CalculatorWork out an exact age in years, months and days between a birth date and any reference date.Date CalculatorFind the number of days between two dates, or add and subtract days, weeks, months or years from a date.Day Counter CalculatorCount the days between two dates, broken down into weekdays, weekend days and full weeks.Day of the Week CalculatorFind the weekday for any date, plus its day of the year, ISO week number and whether the year is a leap year.Days Until / Countdown CalculatorCount the days remaining until a target date, or how many days have passed since it.GPA CalculatorCalculate a grade point average from course grades weighted by credit hours.Grade CalculatorCombine scored items by weight into a final course grade and letter.Hours CalculatorCalculate the hours between a start and end time, subtract breaks and see the result as decimal hours or H:M.Love CalculatorA playful compatibility score between two names — for fun only.Pet Age CalculatorEstimate a dog or cat's age in human-equivalent years.Sleep CalculatorFind the best bedtimes or wake-up times based on 90-minute sleep cycles so you wake between cycles.Time CalculatorAdd or subtract two lengths of time expressed in hours, minutes and seconds.Time Card CalculatorAdd up a weekly time card from daily clock-in and clock-out times and split it into regular and overtime hours.Time Duration CalculatorMeasure the elapsed time between two date-and-time points, shown as totals and a days/hours/minutes breakdown.Time Zone CalculatorConvert a clock time from one UTC offset to another and see if the date changes.Work Days Between Dates CalculatorCount the working days (Monday to Friday) between two dates, excluding any holidays.Zodiac CalculatorFind the Western sun sign and Chinese zodiac animal and element for a birth date.