Age In Weeks Calculator
The Age in Weeks Calculator tells you how many whole weeks old you are. Enter your birth date and it counts the completed weeks from then until today.
Formula
Weeks = Total Days ÷ 7 (rounded down)
- The calculator counts the whole days between your birth date and today, then divides by 7 to get completed weeks.
- Leftover days that don't make a full week are not counted.
- Because it uses actual elapsed days, leap years are handled automatically.
- A future birth date returns zero weeks.
Example Calculation
Inputs
- Birth Date: 2000-01-01
Someone born on 1 January 2000 has lived well over 1,000 weeks; the calculator shows the completed-week count up to today.
Frequently asked questions
How many weeks old am I?
Enter your date of birth and the calculator returns the number of completed weeks from then until today.
What happens to leftover days?
Days that don't make a full week are dropped, since only completed weeks are counted.
Is this useful for babies?
Yes. A newborn's age is often given in weeks during the first months.
Are leap years included?
Yes. The day count is based on actual elapsed time, so leap days are accounted for.
What about a future date?
A birth date in the future returns zero, since no weeks have elapsed.