Pregnancy Calculator
Track your pregnancy progress by week and trimester. Calculate how far along you are, see upcoming milestones, and countdown to your due date.
Track your pregnancy by entering your due date or last period. A full pregnancy is 40 weeks divided into three trimesters.
Enter your information to see your current week, trimester, and upcoming milestones.
Enter Your Information
Enter your estimated due date as provided by your healthcare provider.
Understanding Your Pregnancy Timeline
Pregnancy is dated from the first day of your last menstrual period (LMP), not from conception. This means you're considered "2 weeks pregnant" at the time of conception — a quirk of medical dating that confuses almost everyone at first. A full-term pregnancy is 40 weeks, or 280 days from LMP.
Only about 5% of babies arrive on their exact due date. Most births occur within a 5-week window from 37 to 42 weeks. Anything from 37 weeks onward is considered full-term. Before 37 weeks is preterm, and after 42 weeks is post-term. Your due date is a best estimate, not a deadline.
Trimester Guide: What to Expect
| Trimester | Weeks | Baby's Development | Common Symptoms |
|---|---|---|---|
| First | 1–12 | Organ formation, heartbeat by week 6, all major structures by week 12 | Nausea, fatigue, breast tenderness, frequent urination |
| Second | 13–26 | Rapid growth, movement felt (16–22 weeks), sex visible on scan | Energy returns, baby bump appears, back pain may start |
| Third | 27–40 | Brain development, lung maturation, baby gains most weight | Fatigue returns, Braxton Hicks, heartburn, difficulty sleeping |
Key milestone: Week 24 is considered the "viability threshold" — the point at which a baby has a reasonable chance of survival if born prematurely, though with significant medical intervention. Survival rates improve dramatically with each additional week: 50% at 24 weeks, 80% at 28 weeks, 95%+ at 32 weeks.
Key Prenatal Appointments
| Week | Appointment | What Happens |
|---|---|---|
| 8–10 | Booking appointment | Medical history, blood tests, dating scan booked |
| 11–14 | Dating scan + screening | Nuchal translucency measurement, confirms due date |
| 16 | Antenatal check | Blood pressure, urine test, blood test results reviewed |
| 18–21 | Anatomy scan | Detailed organ check, growth measurements, sex can be determined |
| 25–28 | Glucose test | Screening for gestational diabetes |
| 36 | Position check | Baby's position assessed, birth plan discussed |
What to Pack in Your Hospital Bag
For You (Labour)
Birth plan copies, comfortable nightdress or old t-shirt, lip balm, hair ties, snacks (cereal bars, dried fruit), isotonic drinks, phone charger, TENS machine if using one.
For You (After Birth)
Maternity pads (heavy flow), comfortable underwear, nursing bra, going-home outfit (you'll still look 6 months pregnant), toiletries, towel, slippers with grip.
For Baby
Newborn nappies (10+), cotton wool, 2-3 vests, 2-3 sleepsuits, hat, blanket, car seat (hospitals won't let you leave without one), muslin cloths.
Pack your bag by week 36. First babies often come late, but not always — and you don't want to be searching for your phone charger during contractions. Keep the bag by the front door from week 37.
Related Pregnancy Tools
How to use this tool
Select your calculation method (Due Date, Last Period, Ultrasound, etc.)
Enter the required date information
Click 'Calculate Progress' to see your current pregnancy status
Common uses
- Tracking pregnancy progress by week
- Knowing your current trimester
- Counting down to your due date
- Reviewing upcoming prenatal milestones
- Estimating conception date from your due date
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