Pregnancy Due Date Calculation

Pregnancy typically lasts 40 weeks (280 days) from the first day of your last menstrual period (LMP).

How to Calculate Due Date

Due Date = LMP + 280 days

Or use Naegele's Rule:

1. Take LMP date
2. Add 7 days
3. Subtract 3 months
4. Add 1 year

Calculate your due date: Pregnancy Calculator

Pregnancy Trimesters

First Trimester (Weeks 1-12)

• Baby's organs start forming
• Common symptoms: nausea, fatigue
• Critical period for development

Second Trimester (Weeks 13-26)

• Baby's movements felt
• Anatomy scan at week 20
• Energy levels improve

Third Trimester (Weeks 27-40)

• Baby gains weight
• Prepare for delivery
• More frequent checkups

Key Milestones

| Week | Milestone | |------|-----------| | 6 | Heartbeat detected | | 12 | End of first trimester | | 20 | Anatomy scan | | 28 | Third trimester starts | | 37 | Full term begins | | 40 | Due date |

Related Calculators

• Pregnancy Calculator
• Due Date Calculator
• Ovulation Calculator
• Period Calculator