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
May 11, 2027
Gestational Age0 weeks, 0 days
Estimated ConceptionAug 18, 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
Aug 4, 2026 – Nov 2, 20262nd TrimesterWeeks 13–26
Nov 3, 2026 – Feb 8, 20273rd TrimesterWeeks 27–40
Feb 9, 2027 – May 11, 2027Key Milestones
First Heartbeat Detectable~Week 6
Sep 15, 2026End of First Trimester~Week 12
Oct 27, 2026First Fetal Movement~Week 18
Dec 8, 2026Viability Milestone~Week 24
Jan 19, 2027Third Trimester Begins~Week 27
Feb 9, 2027Full Term~Week 37
Apr 20, 2027