Home / Calendar & Time / Age Calculator
Age Calculator
Exact age in years, months and days, totals in weeks and days, next birthday, star sign and day milestones.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Age Calculator works
Worked out in your browser with your device clock and time zone. Calendar files follow the iCalendar standard (RFC 5545), so Google, Apple and Outlook all open them. Leap years and 29 February birthdays are handled.
Input: Date. Output: Text.
How to use Age Calculator
- Type the date of birth.
- Change the second date to find age on any day.
Tips
- Times use your device time zone. Calendar files store times in UTC, so everyone sees their own local time.
- ICS files open in Google Calendar, Apple Calendar and Outlook.
Age Calculator FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
Related tools
- Date Calculator: Difference between dates, add/subtract days, business days.
- Week Number Calculator: Find the ISO week number of any date, the dates of any week, and a full list of weeks for a year.
- Calendar Event Maker (ICS): Make an .ics invite with reminders and repeats, plus Add to Google and Outlook calendar links.
- Merge Calendar Files: Combine ICS calendars into one, remove duplicates and keep only a date range or events with a word.