Lifestyle & Sleep
Age Calculator
Exactly how old are you, to the day? Get years, months, days, total days, and the countdown to your next birthday.
Age calculation from a date of birth is done by subtracting the birth date from today, then adjusting for whether the birthday has occurred this year. The calculator shows years, months, and days precisely. Use the result as a planning estimate; individual circumstances vary.
Exact age: years, months, days.
Also total days and weeks.
Next-birthday countdown included.
Calculate Your Age
Your Age
What Is Age?
Your exact age is more than years: months and days matter for legal thresholds, medical dosing, and, let's face it, birthday countdowns.
The calculator computes the full breakdown plus total days lived, total weeks, the weekday you were born, and days until your next birthday.
How It Is Calculated
Age = today − date of birth, adjusted for months and days
Example: Example: born Apr 15, 1995 → 31 years, 4 months, 2 days (on Aug 17, 2026)
Age in different units
| Unit | Example (born Apr 15, 1995, today Aug 17, 2026) |
|---|---|
| Years | 31 |
| Months | 376 |
| Weeks | 1,635 |
| Days | 11,448 |
Limitations
- Date math follows the Gregorian calendar; leap days are handled correctly.
- For legal purposes, jurisdictions may define age attainment differently.
Sources & Review
References used for this calculator’s formulas and thresholds:
Age FAQ
How is age calculated exactly?
Subtract the birth year from the current year, then adjust months and days, borrowing days from the previous month when needed.
How many days old am I?
Your age in years × 365.25 approximates it; the calculator gives the exact figure including leap days.
When do I legally turn a year older?
In most jurisdictions, on the anniversary date itself, from midnight of that day.
Why does month math matter for age?
Medical dosing, retirement eligibility, and school enrollment all use exact age, not rounded years.
A note before you begin: this tool offers educational estimates only. It cannot replace advice from a qualified professional.