Age calculator
Calculate exact age in years, months and days, total days lived, the weekday you were born, your zodiac sign and the countdown to your next birthday.
- Free
- No sign-up
- No file uploaded
- Windows, Mac, Android, iPhone
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About this tool
Enter a date of birth: your exact age appears in years, months and days, with total months, weeks and days lived, the weekday you were born, your zodiac sign and the countdown to your next birthday.
When to use it
Forms and paperwork
Some forms ask for your age on a specific date: pick that reference date instead of today.
Birthdays and milestones
Find out when you will celebrate 10,000 days, and how many days are left until your next birthday.
Time between two dates
The tool also gives the time between any two dates: years of service, age of a building, length of a contract.
How to use
- Enter the date of birth.
- Keep today's date or choose another.
- Read the exact age and statistics.
How it works
The tool counts whole months since birth, then the remaining days. Someone born on January 31 has a monthly anniversary on February 28 or 29, as in common use.
Someone born on February 29 celebrates on February 28 in non-leap years. The weekday and zodiac sign (tropical zodiac) are derived from the date of birth.
Tips for best results
- Change the reference date to find an age on a past or future date.
- The number of hours is approximate: it ignores the time of birth.
- For the time between two events, enter the first date as the birth date.
- Dates are read without a time zone: the result does not depend on the country.
Common problems and fixes
A message says the birth date is later
The reference date is before the date of birth: check the year you typed.
The age differs by a day from another site
Sites handle month ends differently. Here, a month ends on the same day of the next month, or its last day if that day does not exist.
The date picker shows another format
The date picker format follows your browser's language settings.
Frequently asked questions
How do I calculate my exact age?
Count the whole years and months, then the days since the last monthly anniversary: that is what the tool does.
What day of the week was I born?
It appears in the “Born on a” box as soon as you enter the date.
When do leap-day babies celebrate?
The tool uses February 28 in non-leap years; some prefer March 1.
Is my date of birth stored?
No, everything is calculated in your browser.
Related searches
Still stuck?
Ask on the forum: the category, the tool, your device sheet and the test result will be filled in for you.