Pregnancy Calculator
Week-by-Week Timeline (40 Weeks)
What is a Pregnancy Calculator?
A Pregnancy Calculator is a simple yet powerful tool that helps you determine key pregnancy dates based on your last menstrual period (LMP), conception date, or estimated due date. Using standard obstetric calculations (280 days from LMP), it provides an accurate timeline for:
📅 Estimated Due Date – When your baby is most likely to arrive
📆 Current Pregnancy Week – Which week you are in right now
👶 Key Pregnancy Milestones – From implantation to full term
📊 Pregnancy Progress – A percentage of how far you are along
This takes away the guesswork and makes tracking pregnancy easier for both parents and healthcare providers.
Why This Calculator is Important
Pregnancy tracking isn’t just exciting — it’s vital. Here’s why using a calculator like this matters:
✅ Better Planning: Helps schedule doctor visits, ultrasounds, and maternity leave.
✅ Baby’s Development: Know when key milestones (heartbeat, gender reveal, viability) occur.
✅ Health Monitoring: Helps you keep track of trimester changes and possible risk windows.
✅ Peace of Mind: Provides a clear timeline to reduce anxiety and stay informed.
Having this information at your fingertips allows you to make healthier decisions during pregnancy.
How to Use the Pregnancy Calculator
Using our calculator is straightforward:
Choose an Event Type:
Last Period
Conception Date
Due Date
Select the Date:
Pick the date relevant to your chosen event from the calendar.
Click Calculate:
Instantly see your due date, current week of pregnancy, and a week-by-week milestone table up to Week 40.
You’ll also see a progress bar showing what percentage of your pregnancy journey is complete.
Pregnancy Week-by-Week Overview
The calculator generates a 40-week pregnancy timeline so you can follow your baby’s growth. For example:
Week 3: Implantation occurs
Week 6: Heartbeat detectable by ultrasound
Week 13: Miscarriage risk decreases significantly
Week 18: Gender reveal possible
Week 29: Baby can breathe
Week 37: Baby considered full term
Knowing these stages helps expectant parents feel connected and prepared.
FAQs About the Pregnancy Calculator
1. How accurate is this calculator?
It uses standard medical formulas and is highly reliable for most pregnancies. However, actual delivery dates can vary since only about 5% of babies are born exactly on their due date.
2. Can I use this if my cycles are irregular?
Yes, but you should enter the most accurate date possible for your last period or use your doctor-provided due date for best results.
3. Does this calculator work for IVF pregnancies?
Yes — just select “Conception Date” and use your embryo transfer date as conception day (adjusting for embryo age).
4. Why do doctors use LMP even if I know my conception date?
LMP-based dating standardizes pregnancy measurement and ensures consistent comparison across all patients.
5. When should I see a doctor after using this calculator?
It’s best to schedule your first prenatal visit around 6–8 weeks after your last period or as soon as you find out you are pregnant.
Final Thoughts
Pregnancy is one of the most exciting journeys of life — and having a clear timeline makes it even more special. Our Pregnancy Calculator helps you plan ahead, stay on top of appointments, and celebrate each milestone. Bookmark this page and share it with friends or family who are expecting.
