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Ovulation Calculator 2026 — Free Online Tool

Calculate fertile window, peak ovulation date & pregnancy due date.

Quick Answer

Ovulation typically occurs 14 days before your next period begins. Your fertile window spans the 5 days leading up to ovulation plus ovulation day itself (a 6-day fertile window).

Last updated: 2026-07-31 Editorially reviewed by PakDigitalz Editorial Team
Medical Disclaimer: This tool provides mathematical estimates based on average cycle lengths and is not a substitute for professional medical advice, diagnosis, or contraception. Consult a healthcare provider for personalized fertility or pregnancy guidance.

Enter Cycle Information

Estimated Ovulation Date
Fri, Sep 18, 2026

~0 days from today

Peak Fertile Window
Sun, Sep 13, 2026 – Sat, Sep 19, 2026

Highest chance of conception

Next Expected Period
Fri, Oct 2, 2026

~14 days away

Conception & Pregnancy Due Date Estimator (Naegele's Rule)

If conception occurs during this cycle, here is your estimated pregnancy due date and milestone timeline based on 280 days (40 weeks) from your LMP:

Estimated Due Date
Fri, Jun 11, 2027
40 weeks from LMP
1st Trimester End
Fri, Nov 27, 2026
End of Week 12
2nd Trimester End
Fri, Mar 12, 2027
End of Week 27

How to Use This Tool

  1. Select the first day of your Last Menstrual Period (LMP).
  2. Adjust your average menstrual cycle length (default is 28 days, normal range 21 to 35 days).
  3. View your estimated peak ovulation date, 6-day fertile window, and next period start date.
  4. Check the bonus Pregnancy Due Date (Naegele's Rule: 280 days) if conception occurs during this cycle.

Formula & Specifications

Ovulation Day = LMP + Cycle Length - 14 Days | Fertile Window = Ovulation Day - 5 Days to Ovulation Day + 1 Day | Due Date = LMP + 280 Days

About Ovulation Calculator

Calculate your peak fertile days, ovulation date, next menstrual period, and estimated pregnancy due date. Essential tool for fertility planning, pregnancy tracking, and natural cycle management.

Frequently Asked Questions

How is ovulation calculated?

Ovulation is estimated by subtracting 14 days from your next expected period start date. For a standard 28-day cycle, ovulation typically occurs on day 14.

What is the fertile window?

The fertile window consists of the 5 days leading up to ovulation plus ovulation day itself. Conception is most likely during the 2-3 days before ovulation.

How accurate is this calculator?

This calculator provides a mathematical estimate based on average cycle lengths. Actual ovulation varies based on stress, hormone changes, and cycle irregularity.

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Expert Note

This tool uses the latest international formulas and rates. Results are for estimation purposes. For legal or financial decisions, consult a qualified professional. Built and maintained by the PakDigitalz team.

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