1. What is Menstrual Cycle Time?

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

2. How Does the Calculator Work?

The calculator uses the following calculation:

Where:

• Cycle Start Date — First day of menstrual bleeding
• Cycle End Date — First day of next menstrual bleeding
• Number of Cycles — Total number of complete cycles measured

Explanation: The calculator measures the days between consecutive period start dates and averages them.

3. Importance of Tracking Cycle Time

Details: Regular cycle tracking helps identify ovulation patterns, fertility windows, and potential health issues. Irregular cycles may indicate hormonal imbalances or other conditions.

4. Using the Calculator

Tips: Enter at least 3 consecutive cycle start dates (YYYY-MM-DD format) for accurate results. More dates provide better averages.

5. Frequently Asked Questions (FAQ)

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

Q2: How many cycles should I track?
A: Track at least 3-6 cycles for reliable averages, as cycle length can vary monthly.

Q3: When should I be concerned about cycle irregularity?
A: If cycles vary by more than 7-9 days regularly, or if you skip periods entirely, consult a doctor.

Q4: Can stress affect cycle length?
A: Yes, stress, illness, weight changes, and travel can temporarily alter cycle length.

Q5: Does birth control affect cycle tracking?
A: Hormonal contraceptives often regulate or eliminate natural cycles, making tracking less meaningful.