Pregnancy calculators by amma
Free, evidence-based tools to help you track your pregnancy. Convert weeks to months, estimate your due date, and follow your week-by-week progress.
Due date calculator
By LMP or conception
Weeks to months
Weeks ↔ months
Ovulation calculator
Fertile window
About these calculators
Our calculators use standard obstetric conventions: 40 weeks of gestation counted from the first day of your last menstrual period (Naegele's rule). Results are estimates — always confirm with your healthcare provider.