Calculate your current gestational age in weeks and days from the first day of your last menstrual period. Also shows trimester.
How it works
- Enter the first day of your last period.
- The calculator shows weeks and days pregnant.
- See which trimester you are in.
Frequently asked questions
Is this the same as due date?
Yes — gestational age is how the due date is calculated (LMP + 280 days).
What if my cycles are irregular?
Ultrasound dating is more accurate. This is an estimate based on LMP.
When does the third trimester start?
Around week 27.