Gestational Age Calculator
Calculate the gestational age of your baby in weeks and days from your LMP date.
How to Use the Gestational Age Calculator
Calculate the gestational age of your baby in weeks and days from your LMP date. Enter your information in the form above and get instant results.
Medical Disclaimer: This tool is for informational purposes only. Always consult your healthcare provider for medical advice.
Frequently Asked Questions
What is gestational age?
Gestational age is measured in weeks from the first day of the LMP. At full term, gestational age is 40 weeks.
How is gestational age different from fetal age?
Fetal age (developmental age) counts from conception — about 2 weeks less than gestational age. Doctors always use gestational age.
What is considered full term?
Full term is 39–40 weeks gestational age. Early term is 37–38 weeks. Late term is 41 weeks. Post-term is 42+ weeks.