Pregnancy Due Date Calculator
Calculate your estimated due date, current pregnancy week, trimester, and key milestones from your last menstrual period (LMP).
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Enter the first day of your last menstrual period to calculate your due date.
Pregnancy Milestones
| Week | Milestone |
|---|---|
| Week 4 | Embryo implants; pregnancy confirmed by test |
| Week 6 | Heartbeat detectable by ultrasound |
| Week 8 | Embryo becomes fetus; all organs forming |
| Week 10 | Fingers and toes fully separated |
| Week 12 | End of first trimester; risk of miscarriage drops |
| Week 14 | Second trimester begins; baby can make facial expressions |
| Week 16 | Gender may be visible on ultrasound |
| Week 20 | Anatomy scan; baby can hear sounds |
| Week 24 | Viability milestone; lungs begin producing surfactant |
| Week 28 | Third trimester begins; eyes can open and close |
| Week 32 | Baby practises breathing movements |
| Week 36 | Baby considered early term; most organs ready |
| Week 37 | Baby is full term |
| Week 40 | Estimated due date |
Maternity Leave by Country
| Country | Duration |
|---|---|
| India | 26 weeks |
| Sweden | 68 weeks |
| Norway | 49 weeks |
| Denmark | 52 weeks |
| Germany | 14 weeks |
| United Kingdom | 52 weeks |
| France | 16 weeks |
| Russia | 20 weeks |
| Brazil | 17 weeks |
| United States | 12 weeks |
| Thailand | 14 weeks |
| China | 14 weeks |
Medical Disclaimer
This calculator provides estimates based on Naegele's Rule and is intended for informational purposes only. Individual pregnancies vary. Always consult your healthcare provider for accurate dating and medical advice.
Frequently Asked Questions
The estimated due date (EDD) is calculated using Naegele's Rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This assumes a 28-day cycle with ovulation on day 14. Most pregnancies deliver within ±2 weeks of the EDD — only about 5% of babies are born on their exact due date.
Gestational age is counted from the first day of your last menstrual period (LMP) and is the standard used by doctors. Fetal age (or fertilization age) counts from conception, roughly 2 weeks later. So when your doctor says you are 8 weeks pregnant, the fetus is about 6 weeks old. Gestational age is always used in this calculator.
The first trimester runs from week 1 to week 13 (conception to about 3 months). The second trimester covers weeks 14 to 26 — often the most comfortable period with reduced nausea and more energy. The third trimester is weeks 27 to 40, ending at the due date. These divisions help track development and schedule antenatal care appointments.
Week 24 is often called the 'viability threshold' — the point at which babies born prematurely have a reasonable chance of survival with intensive neonatal care. Survival rates improve significantly each week from 24 onward. At 24 weeks, a baby's lungs begin producing surfactant (a substance needed to breathe air). By 28 weeks, survival rates exceed 90% at specialist centres.
Pregnancy Due Date Calculator
Calculate your estimated due date, current pregnancy week, trimester, and key milestones from your last menstrual period (LMP).
//
Enter the first day of your last menstrual period to calculate your due date.
Pregnancy Milestones
| Week | Milestone |
|---|---|
| Week 4 | Embryo implants; pregnancy confirmed by test |
| Week 6 | Heartbeat detectable by ultrasound |
| Week 8 | Embryo becomes fetus; all organs forming |
| Week 10 | Fingers and toes fully separated |
| Week 12 | End of first trimester; risk of miscarriage drops |
| Week 14 | Second trimester begins; baby can make facial expressions |
| Week 16 | Gender may be visible on ultrasound |
| Week 20 | Anatomy scan; baby can hear sounds |
| Week 24 | Viability milestone; lungs begin producing surfactant |
| Week 28 | Third trimester begins; eyes can open and close |
| Week 32 | Baby practises breathing movements |
| Week 36 | Baby considered early term; most organs ready |
| Week 37 | Baby is full term |
| Week 40 | Estimated due date |
Maternity Leave by Country
| Country | Duration |
|---|---|
| India | 26 weeks |
| Sweden | 68 weeks |
| Norway | 49 weeks |
| Denmark | 52 weeks |
| Germany | 14 weeks |
| United Kingdom | 52 weeks |
| France | 16 weeks |
| Russia | 20 weeks |
| Brazil | 17 weeks |
| United States | 12 weeks |
| Thailand | 14 weeks |
| China | 14 weeks |
Medical Disclaimer
This calculator provides estimates based on Naegele's Rule and is intended for informational purposes only. Individual pregnancies vary. Always consult your healthcare provider for accurate dating and medical advice.
Frequently Asked Questions
The estimated due date (EDD) is calculated using Naegele's Rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This assumes a 28-day cycle with ovulation on day 14. Most pregnancies deliver within ±2 weeks of the EDD — only about 5% of babies are born on their exact due date.
Gestational age is counted from the first day of your last menstrual period (LMP) and is the standard used by doctors. Fetal age (or fertilization age) counts from conception, roughly 2 weeks later. So when your doctor says you are 8 weeks pregnant, the fetus is about 6 weeks old. Gestational age is always used in this calculator.
The first trimester runs from week 1 to week 13 (conception to about 3 months). The second trimester covers weeks 14 to 26 — often the most comfortable period with reduced nausea and more energy. The third trimester is weeks 27 to 40, ending at the due date. These divisions help track development and schedule antenatal care appointments.
Week 24 is often called the 'viability threshold' — the point at which babies born prematurely have a reasonable chance of survival with intensive neonatal care. Survival rates improve significantly each week from 24 onward. At 24 weeks, a baby's lungs begin producing surfactant (a substance needed to breathe air). By 28 weeks, survival rates exceed 90% at specialist centres.