📐 Pregnancy Due Date Formula
Estimated Due Date = Last Menstrual Period + 280 days (adjusted for cycle length difference from 28 days)
- LMP: First day of your last period
- Cycle Length: Average days between periods
Pregnancy Due Date Calculator
Expecting a baby? Use this calculator to find out your Estimated Due Date (EDD). By entering the first day of your Last Menstrual Period (LMP) and your cycle length, we calculate exactly when your baby is due and how far along you currently are.
Input Parameters
Day
Days
Results
Estimated Due DateOctober 22, 2026
Weeks Pregnant (Approx)23
Current Trimester2nd Trimester
Visual Breakdown
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📝 Example
If your last period started on Jan 1st, and you have a typical 28-day cycle, your estimated due date is Oct 8th (280 days later).
✅ Benefits
- •Plan ahead for your baby's arrival.
- •Track your pregnancy milestones accurately.
- •Adjusts for women with longer or shorter menstrual cycles.
❓ Frequently Asked Questions
How accurate is the due date calculator?
The calculator provides an estimate. Only about 5% of babies are born exactly on their due date, but it gives your doctor a baseline to track fetal development. Most babies arrive between 38 and 42 weeks.
Why does cycle length matter?
The standard 280-day rule assumes a 28-day menstrual cycle where ovulation occurs on day 14. If your cycle is longer (e.g., 32 days), you likely ovulated later, which pushes your due date back slightly.
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