Period Calculator
Track your menstrual cycle, predict ovulation, fertile window, and next period dates with our scientific calculator
Enter Your Cycle Information
Your Cycle Analysis
Next Period Start
October 15, 2023
Fertile Window
October 1 - October 5, 2023
Ovulation Date
October 3, 2023
Safe Period
October 6 - October 12, 2023
Cycle Visualization
Frequently Asked Questions
How accurate is this period calculator?
Our period calculator uses scientific algorithms based on your cycle history to predict future periods. While it's highly accurate for regular cycles, individual variations can occur due to stress, illness, or hormonal changes.
What is the fertile window?
The fertile window is the 5-6 days in your menstrual cycle when you're most likely to get pregnant. This includes the 5 days before ovulation and the day of ovulation itself.
Can I use this calculator for birth control?
While this calculator can help identify fertile days, it should not be used as a primary method of birth control. The calendar method alone has a typical failure rate of about 24%. Always consult with your healthcare provider about reliable contraception.
Why are my periods irregular?
Period irregularity can result from various factors including stress, significant weight changes, hormonal imbalances, thyroid disorders, polycystic ovary syndrome (PCOS), or perimenopause. If you have persistent irregular cycles, consult a healthcare provider.
How can I make my cycle more regular?
Maintaining a healthy weight, reducing stress, exercising moderately, and following a balanced diet can help regulate your cycle. In some cases, medical treatment may be necessary for underlying conditions.