Calculate Pregnancy Weeks
Calculate how many weeks pregnant you are based on the first day of your last menstrual period.
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What are pregnancy weeks?
Pregnancy weeks indicate how far a pregnancy has progressed. Doctors and midwives usually count from the first day of the last menstrual period (LMP).
A full-term pregnancy lasts an average of 40 weeks.
What does this tool do?
This tool:
- calculates the number of pregnancy weeks
- also shows the number of weeks remaining
- provides an estimated due date
The calculation is based on a standard pregnancy duration and is intended as a guideline.
Who is this tool for?
- pregnant women
- partners
- healthcare professionals
- health and social care students
Important note
The result is an estimate. The actual gestational age can be determined by a midwife or doctor.