Pregnancy Due Date Calculator

Calculate your estimated due date and track your pregnancy week-by-week. The DayCalc.io Pregnancy Calculator uses Naegele's Rule — the standard clinical method for estimating due dates from the first day of the last menstrual period (LMP).

What You Get

• Estimated due date calculated using Naegele's Rule (LMP + 280 days)
• Current pregnancy week and trimester
• 15 key milestones from first heartbeat to viability and full term
• Days remaining until birth

Note: the due date is an estimate. Only about 4% of babies arrive on their due date — most are born within two weeks before or after.