Calculates current gestational age from the last menstrual period.
When to use: Determines gestational age in weeks and days to guide management decisions — antenatal investigations, viability assessment, timing of interventions, and appropriate fetal growth benchmarking.
Calculator
Enter number of days since LMP started
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Formula
Gestational Age = Days since LMP ÷ 7
Expressed as weeks + days (e.g., 28+3)
Key Points for NEET PG
GA = days since LMP / 7; normal term delivery at 37–42 weeks (40 weeks = EDD)
Viability threshold: 22–24 weeks in most centres; survival >50% from 25 weeks
Preparing for NEET PG? Recollia's AI Tutor explains the clinical reasoning behind every formula — not just the answer, but the why that examiners test.
