Add Your HeadiMenstrual Cycle Calculator | Track Period & Fertile Windowng Text Here

Menstrual Cycle Calculator

Track your cycle, estimate ovulation dates, identify fertile days, and plan ahead with ease.

Your Cycle Details

Formatted for US Standard (MM/DD/YYYY)
28 Days
20 Days 28 Days (Avg) 45 Days
5 Days
2 Days 5 Days 10 Days
14 Days

Cycle Legend

Period Days
Fertile Window
Estimated Ovulation
Regular Days
Next Period

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— days away

Estimated Ovulation

—

Peak Fertility

Fertile Window

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6 Days Total

Cycle Calendar

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Sun
Mon
Tue
Wed
Thu
Fri
Sat

Upcoming 3-Cycle Forecast

CyclePeriod StartsFertile WindowOvulation

Follicular Phase

Energy levels typically rise after your period ends. Great time for high-intensity workouts and trying new projects.

Fertile Window Insights

Conception chances are highest in the 5 days prior to and day of ovulation. Estrogen peaks around this time.

Luteal Wellness

Progesterone peaks. Prioritize self-care, magnesium-rich foods, and light stretching to manage PMS symptoms.

Medical Disclaimer: This calculator provides estimates based on average menstrual metrics. It is intended for educational purposes and should not be relied upon as a primary method of contraception or for definitive medical diagnosis. Consult a qualified healthcare professional for personalized medical advice.

How to Use the Menstrual Cycle Calculator

Getting personalized insights about your cycle takes just a few seconds. Follow these quick steps to get started:

  1. First Day of Last Period: Select the exact date your most recent menstrual period started (Day 1 of full bleeding).

  2. Average Cycle Length: Enter the average number of days from the start of one period to the start of the next. For most women, this is between 21 and 35 days (28 days is the average).

  3. Period Duration: Input how many days your menstrual flow typically lasts (usually 3 to 7 days).

  4. Luteal Phase (Optional): If you track ovulation using temperature or tests, adjust your luteal phase length (the average phase is 14 days).

What Your Results Mean

1. Next Expected Period

This estimates the start date of your upcoming menstrual cycle based on your personal cycle length. It helps you plan ahead, prepare supplies, and track timing.

2. Peak Fertile Window

Your fertile window includes the 5 days before ovulation plus ovulation day itself. Because sperm can survive in the female reproductive tract for up to 5 days, this 6-day timeframe represents your highest chance of conceiving each month.

3. Estimated Ovulation Day

Ovulation is the release of a mature egg from the ovary. It typically occurs 14 days before your next period begins (during a standard 28-day cycle). The egg remains viable for about 12 to 24 hours after release.

4. 3-Month Cycle Forecast

Our interactive calendar and forecast table project your next three menstrual cycles, helping you plan vacations, travel, events, and family planning goals with confidence.