Age Calculator Free Online
Calculate exact age from any birthdate. Get years/months/days, total days lived, and a countdown to your next birthday.
Results
Pro — bulk batch calculation, API access, history & favorites
API access · Priority queue · Team workspace
Related Tools
Age Calculator Features
Exact Age
Years, months, days — calendar-correct using actual month lengths, not 30-day approximations.
Next Birthday
Days until your next birthday plus the exact date. Handles Feb 29 birthdays (next celebration on Feb 28 or Mar 1 in non-leap years).
Total Days/Months
Some applications need cumulative days lived (e.g., for medication schedules) or months (for child development tracking).
Live Calculation
Type or pick dates, all values update instantly.
Custom As-Of Date
Calculate age "as of" any date — useful for pension calculations, retroactive age verification, or curiosity.
100% Private
All math runs in your browser. No data leaves your device.
Free vs Pro
| Feature | Free | Pro |
|---|---|---|
| Full age calculation | ||
| Live calculation | ||
| All-units result panel | ||
| Bulk batch calculation | — | |
| REST API access | — | |
| Save & share calculations | — |
Frequently Asked Questions
Calendar-aware Y/M/D difference between birthdate and as-of date (default today). Same logic banks and government use for legal age.
Your calculator age increments on March 1 in non-leap years (legal convention in most US states). The next-birthday count shows the closest Feb 29; if not a leap year, treat as Feb 28 or Mar 1.
You haven't reached your birthday yet this year. Until your birthday, your age is last year's value.
This tool gives human age. Dog years vary by breed and size. The simple "× 7" rule is outdated — first 2 dog years ≈ 24 human, then ~4-5 human per dog year after.
Use the Total Days field. A 30-year-old has lived ~10,950-10,958 days (depending on leap years). 50,000 days = ~137 years (longer than anyone has lived).