Due Date Calculator

Developed by Hemant Parashar, B.Sc.

Calculate your estimated due date from your last menstrual period, conception date, or IVF transfer date.

Medical Disclaimer

This tool is provided for educational and informational purposes only. The calculators do not constitute medical advice, diagnosis, or treatment. Always consult a qualified health professional regarding any medical conditions or weight management goals.

First Day of Last Period

Average Cycle Lengthdays

Results

Estimated Due Date

Weeks Pregnant

First Trimester Ends

Second Trimester Ends

Full Term (37 weeks)

How to Use the Due Date Calculator

Estimates baby's due date using Naegele's rule and ovulation intervals. Follow these instructions to compute your results accurately:

Input the first day of your last period to calculate your estimated due date.
Double-check all inputs to prevent calculation errors.
Results are processed instantly in your browser via client-side scripts.

Mathematical Formulas & Calculation Principles

The underlying calculations rely on the following mathematical logic:

            Due Date = LMP + 280 days
          

Frequently Asked Questions (FAQ)

How is Naegele's rule applied?

Naegele's Rule calculates due date by adding 1 year, subtracting 3 months, and adding 7 days to the first day of the last menstrual period.

This tool was developed and verified by Hemant Parashar, B.Sc. Graduate and part-time blogger, to provide free, high-accuracy mathematical resources for educational use. Complex parameters were verified by Hemant Parashar (Developer & Chief Editor).