Free date calculators, no sign-up required

Pick a calculator below. Every tool runs right in your browser, your dates never leave your device.

Business Days Calculator

Count working days between two dates, or find the date a set number of business days from today. Excludes weekends by default, with an option to also exclude US federal holidays.

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Days Between Two Dates

Find the exact number of days, weeks, and months between any two dates, or count how many days ago something was.

Age Calculator

Find your exact age in years, months, and days from a birth date, on today or any other date.

Days Until Calculator

Count down to any future date, or see how many days ago a past date was.

Add or Subtract Days

Add or subtract days, weeks, months, or years from a starting date.

Month Calculator

Find the exact number of whole months between two dates.

Week Number Calculator

Find the ISO 8601 week number for any date.

Leap Year Checker

Check whether any year is a leap year, and see the rule that decides it.

Day of the Year Calculator

Find the ordinal day number for any date, or convert a day number back to a date.

Day of the Week Calculator

Find out what day of the week any date falls on.

Business Days in a Month or Year

Find out how many business days are in any month or any full year.

Date Range Generator

Generate a list of every date between two dates, daily, weekly, monthly, or yearly.

Military Service Calculator

Calculate years of service, retirement eligibility, or terminal leave start date.

Why DatesCalculator.com

Every calculator here handles the real edge cases correctly, leap years, month-length differences, business-day exclusions, without making a show of it. No account, no app to download, and the math runs in your browser rather than on a server. Built and maintained by one person, not a faceless product team, see the about page for the full story.