DateCalc.app
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Free Date Calculators

Date & Time
Calculators

16 free tools to calculate ages, dates, countdowns and more.

Age
Age Calculator Find your exact age in years, months, weeks, days, and seconds. Chronological Age Calculate age between any two dates precisely. Baby Age Calculator Track your baby's age in weeks and months. Dog Age Calculator Convert your dog's age to human years by breed size. Cat Age Calculator See your cat's age in equivalent human years.
Dates
Days Between Dates Count the exact number of days between two dates. Date Calculator Add or subtract days, weeks, months, or years from a date. Business Days Calculator Count working days excluding weekends. Week Number Find the ISO week number for any date. What Day Is It Today Instantly see today's full date, day, and week number.
Countdowns
Days Until Christmas Live countdown to December 25. Days Until New Year Countdown to January 1st. Days Until Halloween Countdown to October 31. Days Until Easter Countdown to the next Easter Sunday. Countdown Timer Set a custom countdown to any target date.
World
Time Zone Converter Convert times between any two time zones worldwide.

What can you calculate with DateCalc.app?

DateCalc.app is a free collection of date and time calculators covering every common calculation you might need. Whether you want to know exactly how old you are to the second, count the days between two dates, find out how many business days remain before a deadline, or convert a time across time zones — this site has a dedicated tool for it. All calculators run directly in your browser with no account required, no ads blocking your view, and no paywalls. The results are instant and the interface is clean, so you spend time on your task — not on the tool.

Why use a dedicated date calculator?

Mental date arithmetic is error-prone: month lengths vary, leap years add a day every four years, and time zones shift the calendar date entirely. A dedicated calculator eliminates guesswork. Professionals use them for legal deadlines, contract durations, project timelines, and compliance windows. Parents use baby-age calculators to track developmental milestones. Pet owners compare their animals' ages in human terms. And everyone counts down to the holidays. DateCalc.app covers all these use cases in English, French, and Spanish, making it a globally accessible resource for anyone who works with dates.

FAQ

What is a date calculator?

A date calculator is a tool that performs arithmetic on calendar dates — such as counting the days between two dates, adding a number of days to a date, or computing someone's age from their birth date. DateCalc.app offers 16 specialized date calculators, each optimized for a specific task.

How do I calculate my age?

Enter your date of birth in the Age Calculator. The tool subtracts your birth date from today's date, handling leap years and month-length differences automatically, and shows your exact age in years, months, weeks, days, and even seconds — updated live.

How many days are between two dates?

Use the Days Between Dates calculator. Enter a start date and an end date and the tool instantly returns the total number of calendar days. You can also use the Business Days Calculator if you need to exclude weekends.

Is DateCalc.app free?

Yes — every calculator on DateCalc.app is completely free to use with no sign-up, no subscription, and no hidden fees. The site is ad-supported but designed to stay fast and uncluttered.

What languages are supported?

DateCalc.app is available in English, French (Français), and Spanish (Español). Every tool is fully translated and uses locale-appropriate date formats. Switch languages using the EN / FR / ES buttons at the top of any page.