How to convert an age to weeks
Enter a start date and an end date.
1
Enter the start date
For an age, use the date of birth.
2
Enter the end date
Use today or another reference date.
3
Choose the form
Read decimal weeks for totals or whole weeks and days for a familiar age.
What does this tool do?
Weeks are a natural unit for pregnancy, infancy and short projects. Dividing calendar days by seven gives a decimal week count, while whole weeks plus days gives the familiar 12 weeks 3 days form.
The Formula
Total weeks = Days between dates ÷ 7; whole weeks = floor(Total weeks)Frequently Asked Questions
Why is the decimal result different from weeks and days?
The decimal divides all days by seven. The weeks-and-days row keeps the whole weeks and counts the remainder separately.
Does the time of day affect the result?
No. Dates are compared at local midnight, so the count is always in whole days.