For the interactive calculator, open the full CalcHealth page.
Open Full CalculatorFrequently Asked Questions
What trimester am I in?
Weeks 1–12: First trimester. Weeks 13–26: Second. Weeks 27–40: Third trimester.
Find out exactly how many weeks pregnant you are, your current trimester, and your baby's development stage.
For the interactive calculator, open the full CalcHealth page.
Open Full CalculatorWeeks 1–12: First trimester. Weeks 13–26: Second. Weeks 27–40: Third trimester.