Age Calculator
Calculate exact calendar age, birthday countdowns, age differences, and age on any date. Runs privately in your browser.
Calculate your age today
Get your completed calendar age, total days, and next-birthday details without DST-sensitive date arithmetic.
Birthday details
Cultural facts
Zodiac and birthstone traditions are shown for entertainment and can vary by culture.
Compare two dates of birth
Find the exact calendar age gap and see which person is older.
Calculate age on another date
Check how old someone was—or will be—on a specific past or future date.
Birth dates are calculated locally in your browser and are never uploaded.
How to Use This Tool
Choose My Age, Age Difference, or Age on Date.
Enter the required birth date and optional comparison date.
Calculate to view the exact calendar breakdown and copyable result.
Frequently Asked Questions
For February 29 births, February 28 is used as the birthday anniversary during non-leap years.
Completed units avoid presenting partial months or weeks as if they were whole units.
No. Calendar ages and total days use date-only arithmetic, so DST clock changes cannot add or remove a day.
No. All age calculations run locally in your browser.
Before You Use This Tool
A quick overview of what this page is good for, how it handles data, and what to expect before you start.
What It Does
- Calculate exact calendar age, birthday countdowns, age differences, and age on any date
- Runs privately in your browser
Access & Privacy
You can use the main workflow without creating an account.
The main workflow runs in your browser, so files stay on this device during processing.
Good Fit For
- Solve one-off browser tasks quickly.
- Get useful output without installing anything first.
- Handle small jobs directly on the page and move on.
For repeated bulk jobs or advanced automation, dedicated desktop software may still be faster.