Pregnancy Due Date Calculator
Pregnancy Due Date Calculator – Know When Your Baby Will Arrive
Find out when your little one is likely to arrive using our easy and accurate Pregnancy Due Date Calculator. Based on the date of your last menstrual period (LMP), this tool gives you a reliable estimate of your baby’s due date within seconds.
What Is a Pregnancy Due Date?
A pregnancy due date is the estimated date on which you are expected to give birth. The standard pregnancy duration is approximately 40 weeks (or 280 days) from the first day of your last menstrual period (LMP). Knowing your due date helps you track pregnancy milestones, schedule appointments, and prepare emotionally and physically for childbirth.
How Is the Due Date Calculated?
Our Pregnancy Due Date Calculator uses the Naegeles Rule, the most commonly used formula in obstetrics:
Due Date = LMP + 280 days (40 weeks)
This method assumes a regular 28-day menstrual cycle. If your cycle length differs, you may want to consult a healthcare provider for a more tailored prediction.
How to Use the Pregnancy Due Date Calculator
Select the first day of your last menstrual period (LMP) using the calendar input.
Click the “Calculate Due Date” button.
Instantly receive your estimated due date in a clear format (e.g., “December 15, 2025”).
That’s it! No login, no hassle—just fast, accurate results.
Who Can Use This Tool?
Expectant mothers tracking their pregnancy
Couples planning for a baby
Midwives and obstetricians
Fertility clinics
Pregnancy coaches and doulas
Why Is Knowing the Due Date Important?
Knowing your expected due date is important for:
Tracking fetal development milestones
Scheduling prenatal check-ups and tests
Planning for maternity leave or delivery options
Preparing emotionally, mentally, and financially for birth
Understanding each trimester and trimester-specific care
Trimester Breakdown (Based on Due Date)
| Trimester | Weeks | Key Developments |
|---|---|---|
| 1st Trimester | Week 1 – 12 | Fetus forms organs, heartbeat detectable |
| 2nd Trimester | Week 13 – 27 | Baby growth accelerates, sex visible |
| 3rd Trimester | Week 28 – Birth | Baby gains weight, gets into birth position |
Other Methods of Estimating Due Dates
Besides LMP-based calculations, other methods include:
Ultrasound Dating: More accurate if periods are irregular or LMP unknown.
Conception Date: Used if conception is confirmed via IVF or ovulation tracking.
Fundal Height Measurements: Used in clinical settings to estimate gestational age.
However, the Pregnancy Due Date Calculator using LMP is a great first step for early pregnancy tracking.
Limitations of the Calculator
It assumes a 28-day menstrual cycle
Actual labor can occur anytime 2 weeks before or after the estimated due date
Not suitable for IVF or assisted reproduction scenarios (those require clinical due date calculators)
Always confirm your estimated due date with a healthcare provider via ultrasound or medical evaluation