From LMP
Sample
First day of last menstrual period
What you get
EDD using 280-day rule of thumb.
Due Date Calculator
Clinical due dates are often adjusted after early ultrasound.
Due Date Calculator
YearMonthDay
Estimated due date
Mar 8, 2026
These tools provide general fitness estimates only and are not a substitute for professional medical advice.
How to Use This Tool
- Input LMP.
- Get one primary EDD.
- Confirm with your provider.
Features
- Single clear EDD output
- Standard menstrual dating
- Copyable text
Example
Frequently Asked Questions
Is EDD exact?
No. The 280-day menstrual rule is a starting estimate. Early ultrasound often adjusts the clinical due date.
Is this medical advice?
No. This calculator is for general education and planning only. Always consult a qualified clinician for personal health decisions.
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