Menstruation, Ovulation, and Pregnancy Calculator With User Guides

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Menstruation & Ovulation Calculator

Enter your last period date and cycle length below.

Last Menstrual Period (LMP):

Average Cycle Length (days):

What It Does:

This smart calculator helps users:

Track their menstrual cycles

Predict their next period date

Identify their fertile window

Know their exact ovulation day

Estimate their pregnancy due date

 Welcome to the Menstruation, Ovulation, and Pregnancy Calculator by iFairTools.com — a realistic, professional, and smart digital tool designed to help women track their period cycle, fertile window, ovulation day, and estimated pregnancy due date

Step-by-Step Instructions:

1. Enter Last Menstrual Period (LMP):

Use the date picker to select the first day of your last period.

2. Enter Average Cycle Length:

Most women have cycles between 25–30 days (default is 28).

3. Press “= Calculate” or “Get Result”

The calculator will instantly show:

Your Next Period Date

Your Ovulation Day

Your Fertile Window (best days to conceive)

Your Estimated Pregnancy Due Date

4. Use Preset Buttons:

25, 28, 30: Set common cycle lengths.

TODAY: Fills in today’s date.

AC: Clears all fields.

Example: Fills with a sample date (for demonstration).

Example Output:

Last Period: 01 Oct 2025  

Next Period: 29 Oct 2025  

Ovulation Day: 15 Oct 2025  

Fertile Window: 10 Oct 2025 to 15 Oct 2025  

Estimated Pregnancy Due Date: 08 Jul 2026