Pregnancy Week Calculator
Health & FitnessFind gestational week, days, and trimester from LMP or due date.
Calculated Result
35w + 5d
Trimester 3 · 250 days since LMP
Formula: Gestational age from LMP
About this calculator
Pregnancy is counted from LMP, not conception. Week 4 is often when a test turns positive. Trimesters split at 14 and 28 weeks.
How It Works & Formula
FormulaGestational age = days since LMP · EDD = LMP + 280
Days = today − LMP. Weeks = floor(days / 7). Trimester 1 < 98 days, 2 < 196 days, else 3.
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