Age Calculator
More date calculators on this page
Four extras that use the same dates you entered above — no need to open another tool.
Your age in other units
Filled in automatically from the date of birth above.
| Unit | Exact amount |
|---|---|
| Months | — |
| Weeks | — |
| Days | — |
| Hours | — |
| Minutes | — |
| Heartbeats (at ~72 bpm) | — |
Days between two dates
Useful for deadlines, notice periods and holiday planning.
Add or subtract time from a date
Enter a negative number to go backwards.
Leap year checker
A year is a leap year when it divides by 4 — except century years, which must divide by 400. That is why 1900 was not a leap year but 2000 was.
Days in each month
| Month | Days |
|---|---|
| January | 31 |
| February | 28 (29 in a leap year) |
| March | 31 |
| April | 30 |
| May | 31 |
| June | 30 |
| July | 31 |
| August | 31 |
| September | 30 |
| October | 31 |
| November | 30 |
| December | 31 |
About this tool
Find your exact age in years, months and days from your date of birth — plus total days lived and your next birthday.
This age calculator tells you your exact chronological age — years, months and days — from your date of birth, along with the total number of days you have lived and how many days remain until your next birthday.
Exact age matters more often than you would think: government forms, visa applications, school admissions, job eligibility limits, insurance and retirement calculations all ask for age on a specific date. That is why this calculator also lets you set an "age at" date — pick an admission deadline or exam date and see precisely how old you (or your child) will be on that day.
The math handles leap years and month-length differences correctly, counting complete years first, then complete months, then the remaining days — the same convention official bodies use.
How to use
- Enter your date of birth.
- Optionally change the “age at” date (it defaults to today).
- Read your exact age in years, months and days — results update instantly.