Pregnancy Test Calculator
A pregnancy test calculator helps estimate your due date and track pregnancy progress. It calculates gestational age based on your last menstrual period (LMP) or conception date. This tool assists in monitoring fetal development stages, planning prenatal care, and preparing for childbirth. Accurate dating helps identify potential due date variations and ensures proper medical follow-up.
Calculate Your Due Date
Calculation Formula
The standard pregnancy calculator uses Naegele's Rule: Due Date = LMP + 280 days. First day of last menstrual period + 7 days - 3 months + 1 year. This estimates 40 weeks gestation. Ultrasound dating may vary slightly.
How to Use
1. Enter first day of last menstrual period
2. Click Calculate button
3. View estimated due date and current gestational age
4. Review trimester breakdown table
5. Use Clear button to reset
Pregnancy Timeline Table
| Trimester | Weeks | Key Developments |
|---|---|---|
| First | 1-12 | Organ formation, positive test |
| Second | 13-27 | Gender reveal, quickening |
| Third | 28-40 | Final growth, labor prep |
FAQs
How accurate is the pregnancy calculator?
The calculator provides an estimate based on standard 28-day cycles. Actual due dates may vary ±2 weeks. Ultrasound confirmation is recommended for medical accuracy.
Can I use this calculator for IVF pregnancies?
For IVF pregnancies, use embryo transfer date instead of LMP. Add 266 days (38 weeks) to transfer date for estimated due date.
What if I don't know my LMP?
If unsure of LMP, consult healthcare provider for ultrasound dating. Early ultrasound (6-9 weeks) provides most accurate gestational age measurement.
Does this work for irregular cycles?
For irregular cycles, the calculation may be less accurate. Add cycle length difference to LMP date before calculating for better estimation.
How is conception date calculated?
Conception typically occurs 11-21 days after LMP. The calculator estimates conception date as LMP + 14 days for standard cycles.