Trimester Calculator

Find out which trimester you're currently in and track your pregnancy milestones.

Calculate From

Enter Your Information

First Day of Last Menstrual Period

The first day of your last period before pregnancy

Pregnancy Trimesters

First Trimester

Weeks 1-12

Second Trimester

Weeks 13-27

Third Trimester

Weeks 28-40

📅

Enter your information to find out which trimester you're in

All Three Trimesters at a Glance

First Trimester

Weeks 1-12

Foundation period with rapid cell division and organ formation

Second Trimester

Weeks 13-27

Golden period with increased energy and visible baby growth

Third Trimester

Weeks 28-40

Final preparation with rapid weight gain and organ maturation

⚠

Medical Disclaimer

This trimester calculator provides estimates based on standard pregnancy calculations and should not replace professional medical advice. Individual pregnancies can vary, and your healthcare provider may adjust dates based on ultrasound measurements or other medical factors. Always consult with your healthcare provider for accurate pregnancy dating and prenatal care recommendations.