// free-toolDOB → AGE
Age Calculator
Enter your birth date (and optionally a target date) to get your exact age in years, months and days — plus the totals in weeks, days, hours and minutes, a countdown to your next birthday with its weekday, the day of the week you were born, your star sign, Chinese zodiac, and for fun, your age on every planet. All computed locally and timezone-safe.
no signup · no watermark · unlimited use
Frequently asked questions
How is years/months/days age computed?
Calendar-accurate: whole years first, then whole months, then remaining days — correctly handling month lengths and leap years, in your local timezone to avoid off-by-one errors.
Is my birth date stored or sent anywhere?
No — everything is computed in your browser and nothing is transmitted or saved.
How does age on other planets work?
Your age in Earth days is divided by each planet's orbital period — on Mercury (88-day years) you're much 'older', on Neptune (165 Earth-year orbit) you may not be 1 yet.
More age & date tools
Need custom tools like this in your product?
I build fast, privacy-first web applications with Next.js — these converters run entirely in the browser, and yours can too.