Calculators
Due Date Calculator
Estimate baby’s due date from last menstrual period (LMP) or conception date. Optional cycle-length adjustment, plus gestational age and trimester. Built by Tolyo.app.
Naegele’s rule assumes 28-day cycles.
Estimated Due Date (EDD)
Dec 16, 2026
Gestational age today
8w 0d
Counted from LMP
Trimester
First trimester
Time to due date
31w 6d
Notes
- LMP method uses Naegele’s rule: EDD = LMP + 280 days, adjusted for cycle length.
- Conception method: EDD = Conception + 266 days (≈ 38 weeks).
- This tool provides estimates only and is not medical advice. Confirm with your clinician.
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