Birthday planning
The next-birthday countdown is useful for reminders, invitations and age-based planning. It is timezone-neutral because it uses dates rather than exact birth times.
🎂 Date math
Age Calculator
Calculate age from a birth date, see a years-months-days breakdown, and find the countdown to the next birthday.
Free browser utility: Inputs are processed locally in your browser. Results are planning references; confirm payroll, legal, tax, school, or contract deadlines with the relevant official source.
Run the calculator
Enter a birth date
The result stays in your browser.
Official checks
For eligibility, benefits, school enrollment, travel or compliance questions, use this only as arithmetic support and verify the governing rule directly.
Related time and date tools
FAQ
How is age calculated?
The calculator subtracts the birth date from the as-of date, then adjusts months and days so the result is expressed as completed years, months and days.
Can I calculate age on a future date?
Yes. Choose any as-of date to estimate age on a birthday, school start date, event date or future deadline.
Is this a legal age calculator?
No. It is a date-math utility. Confirm legal age requirements with the official rule or institution involved.
Source snapshot: built from Omellody GSC/local proxy opportunity work, no external keyword-volume or tool-score claims. Formula and browser behavior reviewed 2026-05-19. Deployment changes are not judged in GSC until coverage reaches this date.