1. What is Menstrual Cycle Length?

The menstrual cycle length is the number of days from the first day of one period to the first day of the next period. A typical cycle lasts between 21-35 days, with 28 days being average.

2. How Does the Calculator Work?

The calculator uses simple date arithmetic:

The calculator also estimates:

• Ovulation date: Typically occurs 14 days before the next period
• Fertile window: The 6-day period ending on ovulation day (sperm can survive up to 5 days)

3. Importance of Tracking Your Cycle

Details: Tracking your cycle helps predict menstruation, identify ovulation for conception or contraception, and detect irregularities that may indicate health issues.

4. Using the Calculator

Tips: Enter the first day of your last period and the first day of your next period. For most accurate results, track several cycles.

5. Frequently Asked Questions (FAQ)

Q1: What's considered a normal cycle length?
A: 21-35 days is considered normal. Less than 21 is polymenorrhea, more than 35 is oligomenorrhea.

Q2: How accurate is the ovulation prediction?
A: This assumes a 14-day luteal phase. Actual ovulation may vary, especially with irregular cycles.

Q3: When should I be concerned about my cycle?
A: If cycles are regularly shorter than 21 days, longer than 35 days, or vary by more than 7-9 days.

Q4: Can I use this for birth control?
A: The calendar method alone is not reliable for contraception. Consider additional methods.

Q5: What affects cycle length?
A: Stress, weight changes, exercise, medical conditions, and age can all affect cycle length.