Best Free Date Calculator Online

Date math can be surprisingly tricky when accounting for varying month lengths, leap years, and different calendar rules. Our free date calculator handles all of this automatically, letting you add or subtract any combination of days, weeks, months, and years from any starting date.

The calculator also computes the exact number of days, weeks, and months between any two dates, including business days only if you need to exclude weekends and holidays. This is essential for project planning, contract deadlines, and event scheduling.

For more time-related tools, try our age calculator for age computations, our countdown timer for event tracking, our pregnancy calculator for due date estimates, and our timezone converter for scheduling across time zones.