Age Calculator
Years, months, days from birthdate
What is Age Calculator?
Compute a person's age from a birth date as years + months + days, plus total months, total weeks, total days, and days until the next birthday. Updates live. Useful for profile displays, ID verification, eligibility checks ("must be 18+"), or just satisfying curiosity about how many days you've been alive.
How do I use Age Calculator?
- Pick a birth date.
- Pick a reference date (today or custom).
- Read the age breakdown.
When should I use Age Calculator?
Age Calculator is for birthdate-based intervals. For arbitrary date-to-date differences with business-day counting, use Date Difference.
Does it show my age in different units?
Yes — years, months, and days together, plus total weeks, days, hours, minutes, and seconds. Updates live to the current moment.
Can I calculate someone else's age at a given date?
Yes. Change "today" to any reference date to find how old someone was on that day — useful for legal forms and historical research.
Is my birthday stored anywhere?
No. The calculation runs in your browser and nothing is saved. Refresh the page and the date is gone.
Is my file uploaded anywhere?
No. Everything runs in your browser. Your files never leave your device, and there is no server component for this tool.