Due
Date
Calculator
Calculate your estimated due date, gestational age, trimester timeline, and pregnancy milestones from your last menstrual period.
Input
Estimated Due Date
Your baby is due
Aug 10, 2027
Gestational Age0 weeks, 0 days
Estimated ConceptionNov 17, 2026
Current Trimester1st Trimester
How It Works
This calculator uses Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP) to estimate your due date.
If your cycle length differs from 28 days, the estimate adjusts accordingly. A longer cycle shifts the due date later; a shorter cycle shifts it earlier.
This calculator provides estimates only. Actual due dates may vary. Consult your healthcare provider for personalized guidance.
Trimester Breakdown
1st TrimesterWeeks 1–12
Nov 3, 2026 – Feb 1, 20272nd TrimesterWeeks 13–26
Feb 2, 2027 – May 10, 20273rd TrimesterWeeks 27–40
May 11, 2027 – Aug 10, 2027Key Milestones
First Heartbeat Detectable~Week 6
Dec 15, 2026End of First Trimester~Week 12
Jan 26, 2027First Fetal Movement~Week 18
Mar 9, 2027Viability Milestone~Week 24
Apr 20, 2027Third Trimester Begins~Week 27
May 11, 2027Full Term~Week 37
Jul 20, 2027