Pregnancy Due Date Calculator

Estimate your baby's due date based on the first day of your last menstrual period.

  • Free Online Tool
  • Instant Results
  • Mobile Friendly
  • No Installation
  • Secure & Private

Understanding This Calculator

Naegele's Rule

The standard method for calculating the estimated due date (EDD) is Naegele's rule, assuming a 28-day cycle.

EDD = LMP + 1 Year - 3 Months + 7 Days

  • LMP: First day of Last Menstrual Period

Example 1

LMP: January 1, 2023.

  • Add 1 Year: Jan 1, 2024
  • Subtract 3 Months: Oct 1, 2023
  • Add 7 Days: Oct 8, 2023
  • Due Date: October 8, 2023

Example 2

LMP: May 20, 2023.

  • Add 1 Year: May 20, 2024
  • Subtract 3 Months: Feb 20, 2024
  • Add 7 Days: Feb 27, 2024
  • Due Date: February 27, 2024

How to Use

  • Select the date of your last menstrual period.
  • Click Calculate.

Frequently Asked Questions

Is this medical advice?

No, this tool is for informational purposes only. Always consult a healthcare professional for medical advice.

Is this calculator free to use?

Yes, this calculator is 100% free and does not require any registration or subscription.

Is it mobile-friendly?

Absolutely! Our tool is optimized for all devices, including mobile phones, tablets, and desktop computers.