Age Calculator
Find your exact age in years, months and days — and the countdown to your next birthday.
- No upload
- Browser-based
- Free
- No signup
Your age
—
—
- In months—
- In weeks—
- In days—
Calculated in your browser with plain date math — nothing you enter is uploaded or stored.
Calculated in your browser.
How to use Age Calculator
- Enter your date of birth.
- Leave 'Age at date' on today, or set another date.
- Read your exact age in years, months and days.
- Check the totals in months, weeks and days, plus your next birthday.
Common use cases
- How old am I exactly.
- Age on a future date.
- Milestones.
Tips
- Months have different lengths, so the 'days' part borrows from the previous month — this matches how ages are normally stated.
- Use it for a pet's age or an anniversary too, not just people.
Troubleshooting
Frequently asked questions
- How is exact age calculated?
- It counts the full years, then remaining months, then remaining days between your date of birth and the target date, borrowing days from the previous month where needed — the same way you'd say '32 years, 4 months, 9 days'.
- Can I calculate age at a past or future date?
- Yes. Set the 'Age at date' field to any date — a past birthday, a future milestone, or today (the default) — and it recalculates instantly.
- When is my next birthday?
- The result shows a countdown in days from the target date to your next birthday.
- Is anything I enter uploaded?
- No. Everything runs entirely in your browser — nothing you enter is uploaded, stored or shared, and no signup is needed.