Intentional severe calorie restriction or aggressive weight loss during pregnancy is not recommended. Focus on wholesome nutrient density, balanced macronutrients, and prenatal vitamins.
Gestational Age Calculator
Calculate your current gestational age in elapsed weeks and days to understand your prenatal screening schedule and fetal developmental milestones.
Gestational Age Milestones
- Gestational age is measured from the first day of your last normal menstrual period (LMP), not conception date.
- Full term pregnancy is considered between 39 weeks 0 days and 40 weeks 6 days.
- First-trimester ultrasound (dating scan) offers the most accurate confirmation of gestational age.
What Is a Gestational Age Calculator?
A Gestational Age Calculator is a specialized clinical reference tool designed for expectant mothers and healthcare observers to track gestational progress and maternal nutritional needs. By evaluating key developmental parameters such as the last menstrual period, conception timing, or pre-pregnancy baseline metrics, it provides evidence-based estimates to support healthy prenatal planning. All outputs are educational estimates and do not replace professional obstetrical ultrasound or clinical prenatal care.
How to Use This Calculator
- Select your calculation method (Last Menstrual Period or Known Due Date).
- Enter the corresponding date into the input field.
- Click 'Calculate Gestational Age' to view your exact gestational week, day, and current trimester.
How This Calculator Works
Gestational age is calculated from the first day of your last normal menstrual period (LMP) to the current date. Even though conception typically occurs approximately two weeks after the LMP in a 28-day cycle, obstetric dating universally counts from the LMP.
Understanding Your Results
Knowing your exact gestational age ensures timely scheduling of routine prenatal tests, such as nuchal translucency scans, anatomy ultrasounds (18-22 weeks), and gestational diabetes screenings (24-28 weeks).
Frequently Asked Questions
What is the difference between gestational age and fetal age?
Gestational age is measured from the first day of your last menstrual period, whereas fetal (embryonic) age is dated from the estimated time of fertilization, which is approximately two weeks shorter.
Why do doctors count from the last period instead of conception?
Because the exact day of ovulation and conception is rarely known with certainty, the onset of the last menstrual period provides a definitive clinical timestamp.
What gestational age is considered full term?
Full term is clinically defined as between 39 weeks 0 days and 40 weeks 6 days. Early term is 37 weeks 0 days to 38 weeks 6 days.
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Important Limitations & Medical Disclaimer
Notice: Gestational age calculations are educational approximations. Official gestational age assignments are made by your obstetric healthcare team based on clinical dates and early ultrasound biometry.