Weeks Calculator

Calculate weeks between dates or add/subtract weeks from a date

Start Date

End Date

What is a Weeks Calculator?

A Weeks Calculator is a tool that helps you calculate the number of weeks between two dates or determine a future or past date by adding or subtracting a specific number of weeks from a given date.

In medical contexts, weeks are often used as a unit of measurement for pregnancy, recovery periods, treatment cycles, and many other healthcare applications where time needs to be measured in weekly increments.

How to Use the Weeks Calculator

The Weeks Calculator offers two main functions:

Calculate Weeks Between Dates

Select the "Calculate Weeks Between Dates" tab.
Enter the start date.
Enter the end date.
Click the "Calculate" button.
The calculator will display the number of weeks between the two dates.

Add/Subtract Weeks

Select the "Add/Subtract Weeks" tab.
Enter the base date.
Choose whether to add or subtract weeks.
Enter the number of weeks.
Click the "Calculate" button.
The calculator will display the resulting date.

Medical Applications

The Weeks Calculator has numerous applications in healthcare:

Pregnancy calculations (gestational age, due date, trimester dates)
Determining recovery periods after surgery or illness
Planning treatment cycles for chemotherapy or other periodic treatments
Scheduling follow-up appointments at specific week intervals
Tracking developmental milestones in pediatrics
Planning rehabilitation schedules
Calculating medication cycles that operate on weekly schedules
Determining the length of hospital stays or treatment durations

Importance of Week Calculations in Obstetrics

In obstetrics, week calculations are particularly important:

Pregnancy is typically measured in weeks (40 weeks is full term)
Fetal development milestones are tracked by week
Prenatal testing and screenings are scheduled at specific weeks
Risk assessments for premature birth are often based on gestational age in weeks
Treatment decisions may depend on how many weeks pregnant a patient is
Postpartum care is often scheduled in weekly increments