What is 🤰 Pregnancy Gestational Age Calculato?
A pregnancy gestational age calculator helps expectant parents determine their due date and track pregnancy progress. This essential tool calculates fetal age using the last menstrual period (LMP), providing week-by-week pregnancy updates. Accurate gestational dating assists in monitoring fetal development, scheduling prenatal tests, and preparing for delivery. Our calculator follows medical standards to estimate conception date, trimesters, and expected delivery date while offering crucial pregnancy health information.
Calculate Your Pregnancy Timeline
Calculation Formula
Gestational age is calculated using Naegele's Rule: Due Date = LMP + 280 days. This formula adds 40 weeks (9 months + 7 days) to the first day of your last menstrual period. The calculation assumes regular 28-day cycles and ovulation occurring at day 14.
How to Use the Calculator
Enter the first day of your last menstrual period (LMP) in the date field. Click "Calculate" to instantly get your estimated due date, current gestational age in weeks/days, and pregnancy trimester. The calculator automatically factors in average cycle length and provides medically-approved pregnancy dating. Regular updates help track fetal growth and prenatal care milestones accurately.
Pregnancy Timeline Table
| Weeks | Trimester | Developmental Stage |
|---|---|---|
| 1-12 | First | Embryonic development |
| 13-27 | Second | Organ maturation |
| 28-40 | Third | Fetal growth |
Pros and Cons
Advantages:
- Quick prenatal planning tool
- Accurate for regular cycles
- Helps schedule medical tests
- Tracks fetal development stages
- Provides pregnancy milestones
- Free and easy to use
- Reduces pregnancy anxiety
- Identifies high-risk pregnancies
- Helps plan maternity leave
- Supports prenatal care decisions
Disadvantages:
- Requires exact LMP date
- Less accurate for irregular cycles
- Doesn't account for conception date
- Not ultrasound-confirmed
- Assumes 28-day cycle
- Doesn't predict actual delivery date
- No fetal health information
- Variations in cycle length affect accuracy
- Doesn't consider IVF pregnancies
- Should be verified by doctor
FAQs
How accurate is gestational age calculator?
Pregnancy calculators are 85-90% accurate for women with regular cycles. Accuracy depends on knowing exact LMP date and having typical 28-day cycles. Ultrasound dating after 8 weeks provides more precise measurements.
Can I use without LMP date?
Without LMP, calculator accuracy decreases significantly. Consult your doctor for ultrasound dating which measures fetal size to estimate gestational age.
Difference from ultrasound dating?
Ultrasound measures fetal size while LMP calculation uses menstrual dates. Early ultrasounds (8-12 weeks) are most accurate for dating.