From LMP
Sample
First day of last menstrual period
What you get
EDD using 280-day rule of thumb.
Due Date Calculator
Enter the first day of your last period to get a single estimated delivery date using the common 280-day (40-week) menstrual rule. Many clinics adjust that date after early ultrasound, so confirm with your provider. The calculator runs locally and does not store your dates.
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.
Related Tools
Pregnancy Calculator
EDD, weeks, and trimester from LMP.
Pregnancy Conception Calculator
Conception and EDD from LMP.
Ovulation Calculator
Ovulation day and fertile window.
Age Calculator
Exact age from your birth date.
BMI Calculator
BMI and category from height and weight.
Calorie Calculator (TDEE)
Maintenance calories (TDEE) estimate.
Body Fat Calculator
Tape-measure body fat estimate (Navy).
BMR Calculator
Basal metabolic rate in kcal/day.
Ideal Weight Calculator
Devine ideal weight from height.