🤰 Gestational Age
Gestational age and trimester from LMP
About this calculator
The Gestational Age calculator estimates how far along a pregnancy is, in weeks and days. Enter the first day of the last menstrual period; the calculator counts forward to today's date, assuming a standard 28-day cycle unless adjusted. Gestational age drives everything from due dates to ultrasound timing and prenatal screening windows. For educational purposes only — always verify with your facility's clinical protocols.
Tip: early ultrasound dating is more accurate than LMP alone, especially with irregular cycles, so treat an LMP-based result as an estimate until confirmed by scan.