Menstrual Cycle Calculator – Track Your Period & Ovulation
Calculate menstrual cycle phases and predict next period
This calculator provides estimates based on average cycles. Consult a healthcare provider for personalized medical advice.
Table of Contents
How to Use
- Enter the first day of your last period
- Enter your average cycle length (default: 28 days)
- Enter your average period duration (default: 5 days)
- Click calculate to see predictions
Menstrual Cycle Phases
The menstrual cycle has four phases: menstrual, follicular, ovulation, and luteal.
| Phase | Days | Description |
|---|---|---|
| Menstrual | 1-5 | Period bleeding occurs |
| Follicular | 6-13 | Uterine lining rebuilds |
| Ovulation | 14 | Egg is released |
| Luteal | 15-28 | Body prepares for possible pregnancy |
Why Track Your Cycle
- Predict periods for planning
- Identify fertile days for conception or contraception
- Monitor cycle irregularities
- Understand your body's patterns
Frequently Asked Questions
- How accurate is this calculator?
- The calculator provides estimates based on average cycle patterns. Actual dates may vary based on individual factors.
- What is a normal cycle length?
- Normal cycles range from 21-35 days, with 28 days being average. Cycle length can vary from month to month.
- When is the fertile window?
- The fertile window is typically 5 days before ovulation through 1 day after, when pregnancy is most likely.
Related Calculators
health
Ankle-Brachial Index (ABI) Calculator
health
Blood Alcohol Content (BAC) Calculator