Calculate your pregnancy due date instantly — plus your full trimester timeline
🤰 Your Pregnancy Details
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Enter your details and click Calculate to find your due date and pregnancy timeline.
Your Baby's Due Date
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Weeks Along
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Days to Go
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Trimester
📅 Key Pregnancy Dates
🩸 Last menstrual period—
🌱 Conception (approx)—
💉 End of 1st trimester—
💉 End of 2nd trimester—
🎉 Due date (40 weeks)—
📆 Early term (37 weeks)—
📊 Your Trimester Progress
First Trimester
Weeks 1–12
Second Trimester
Weeks 13–26
Third Trimester
Weeks 27–40
👶 Pregnancy Development Timeline
Week 4
Implantation
The embryo implants in the uterus. Most pregnancy tests become positive.
Week 6
Heartbeat Begins
Baby's heart begins to beat. Tiny facial features start forming.
Week 8
Limbs Forming
Arms, legs, fingers and toes are developing. Baby is about 1.6cm long.
Week 12
End of 1st Trimester
Miscarriage risk drops significantly. Major organs are formed.
Week 16
Movement Begins
Baby starts making small movements. Gender may be visible on scan.
Week 20
Halfway Point
Anatomy scan typically performed. Baby is about 25cm long.
Week 28
3rd Trimester
Baby opens eyes and can hear sounds. Brain developing rapidly.
Week 37
Full Term
Baby is considered full term. Most organs are fully developed.
Week 40
Due Date
Your estimated due date. Only 5% of babies arrive exactly on this day!
Understanding Your Due Date
Everything you need to know about pregnancy dating
How is Due Date Calculated?
The standard method adds 280 days (40 weeks) to the first day of your last menstrual period. This is called Naegele's Rule and is used by doctors worldwide.
How Accurate Is It?
Only about 5% of babies arrive on their exact due date. Most babies arrive within two weeks either side. Your due date is an estimate — not a deadline!
What Are Trimesters?
Pregnancy is divided into three trimesters. The first is weeks 1–12, the second is weeks 13–26, and the third trimester runs from week 27 to birth at around week 40.
When to See a Doctor
Always confirm your due date with your doctor or midwife. An early ultrasound is the most accurate way to date your pregnancy and should be your primary reference.