VitalMetricHubMedical disclaimer
This tool is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult your doctor or qualified healthcare professional before making any health-related decisions. Results are estimates only.
Last medically reviewed: March 2026
Content last updated: March 30, 2026
Due date calculator
Naegele’s rule adds 280 days (40 weeks) to the first day of your last menstrual period. Dating scans may adjust your official due date.
Age notice (18+)
Fertility and pregnancy tools on VitalMetricHub are intended for adults. They are not a substitute for care from an obstetrician, midwife, or other licensed clinician.
VitalMetricHub does not knowingly collect personal information from children under 13 (COPPA). These tools are not directed at minors.
Sources, formulas & further reading
Based on: Naegele’s rule (LMP + 280 days) and conception + 266 days (educational dating only).
For additional clinical context, see independent references from the publishers below (WHO, CDC, PubMed, Medscape, ACE, ACOG, NIH, NCBI, USDA — as applicable).