Date & Time
Count the days between dates, add up hours worked, find business days for a deadline or calculate an exact age. Calendar math handled correctly, including leap years.
Pay & hours
Hours Between Times CalculatorFind the hours and minutes between a start time and an end time, including overnight spans. Subtract a break and get the answer in decimal hours for timesheets.Work Hours CalculatorAdd up a week of shifts with start times, end times and breaks. Get total hours, regular and overtime hours, and optional gross pay — a quick timesheet you can copy.
Date math
Days Between Dates CalculatorCount the exact number of days between two dates, and see it in weeks, months and years plus business days. Choose whether to include the end date.Days Until Date CalculatorSee how many days are left until any date — a birthday, holiday, deadline or trip — counted from today, with weeks and weekdays remaining.Business Days CalculatorCount working days between two dates, or add business days to a date to find a deadline. Weekends are skipped and you can list your own holidays to exclude.Age CalculatorCalculate exact age in years, months and days from a date of birth, plus total months, weeks and days lived and a countdown to the next birthday.Date CalculatorAdd or subtract days, weeks, months and years from any date to find a deadline, due date or anniversary. Month ends are handled correctly.Week Number CalculatorSee today's ISO week number, or look up the week number, day of the year and days remaining for any date.Online StopwatchA simple, accurate stopwatch with lap times. Start, pause and reset with one click or the space bar; it keeps time correctly even if you switch tabs.