Pregnancy Due Date Calculator
Calculate your estimated due date from your last period or conception date.
Most accurate if you have regular 28-day cycles. Based on Naegele's rule (LMP + 280 days).
Pregnancy Timeline
📅 Delivery Window (±2 weeks)
🤰 Trimester Information
Major organs form. Higher miscarriage risk. Morning sickness common. Screen for Down syndrome.
Baby grows rapidly. Heartbeat can be heard. Anatomy ultrasound performed. Energy increases.
Baby gains weight. Practice contractions. Increased fatigue. Monitor for preeclampsia and gestational diabetes.
💡 Pregnancy Tips
- • Schedule regular prenatal appointments with your healthcare provider
- • Take prenatal vitamins with folic acid
- • Maintain healthy weight gain (25-35 lbs for normal weight)
- • Stay hydrated and eat balanced nutrition
- • Exercise regularly unless advised otherwise by your doctor
- • Due dates are estimates; most babies arrive ±2 weeks
Formula
Naegele's Rule: EDD = LMP + 280 days (40 weeks)
From Conception: EDD = Conception Date + 266 days
Normal delivery range: 38-42 weeks (within ±2 weeks of due date)
How it works
Naegele's Rule: Estimated Due Date (EDD) = LMP + 280 days (40 weeks) From Conception Date: EDD = Conception Date + 266 days (38 weeks from conception) Gestational Age = Current Date − LMP Trimester Breakdown: First Trimester: Weeks 0-13 Second Trimester: Weeks 14-27 Third Trimester: Weeks 28-40 Delivery Window: Early: EDD − 2 weeks (38 weeks) Due Date: EDD (40 weeks) Late: EDD + 2 weeks (42 weeks)
The pregnancy due date calculator estimates your baby's arrival date using Naegele's rule or conception date. Enter your last menstrual period (LMP) or conception date to get your estimated due date, current gestational age, and trimester information. Includes delivery window and pregnancy milestone information.
Why this matters
Knowing your due date helps you plan for pregnancy care, time off work, and baby preparations. Tracking gestational age ensures appropriate prenatal screenings and monitoring. Due dates are estimates—most babies arrive within 2 weeks before or after the predicted date.
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The complete guide to pregnancy due date calculator
Formulas, examples, and tips explained in plain English