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Calculate your due date, track pregnancy progress, and get week-by-week information about your baby's development.
A pregnancy calculator is a tool that helps you estimate your due date based on the first day of your last menstrual period (LMP). It can also provide insights into the current week of your pregnancy and key milestones in your baby’s development.
Our pregnancy calculator uses a standard 40-week gestation period to estimate your due date. By entering the first day of your last period, the tool calculates:
Your estimated due date
Your current week and trimester
The conception date estimate
Fetal development stages
This information helps you stay informed throughout your pregnancy journey.
This free pregnancy calculator is designed for accuracy, ease of use, and clarity. Whether you’re newly pregnant or planning, it gives instant results without requiring registration.
Easy-to-use interface
Based on medical guidelines
Accurate results within seconds
Works on all devices (mobile, tablet, desktop)
No personal data required
Select the first day of your last period (LMP)
Click on Calculate
View your:
Estimated due date
Gestational age
Trimester information
Approximate conception date
The due date is the estimated day your baby will be born. Most pregnancies last around 40 weeks (280 days) from the first day of the last menstrual period. While only 5% of babies are born on their actual due date, it gives a reliable timeframe to prepare for delivery.
| Week | Development |
|---|---|
| Week 4–5 | Heart and brain begin forming |
| Week 8 | Major organs start to develop |
| Week 12 | Baby’s heartbeat can be heard |
| Week 20 | Mid-pregnancy anatomy scan |
| Week 28 | Third trimester begins |
| Week 40 | Full-term delivery window |
This tool is ideal for:
Women trying to conceive
Expecting mothers
Healthcare professionals
Doulas and midwives
Anyone tracking pregnancy progress
Built with medically-reviewed calculations
Regularly updated for algorithm accuracy
Privacy-respecting and ad-free
No download or signup needed
Developed for use by both professionals and the public
Yes, this calculator follows standard obstetric calculations based on a 28-day cycle and 40-week gestation.
No. It gives an estimated due date, not an exact birth date. Babies can be born anytime between 37 to 42 weeks.
While LMP is the most accurate method, if you know the conception date, you can estimate the due date by adding 266 days.
Calcnest.online is your go-to platform for accurate, fast, and free online calculators. From finance to fitness, we help simplify your daily calculations so you can focus on what matters most.