Learn how to effectively use our period tracker and understand your results.
Your menstrual cycle is more than just your period—it's a complex hormonal process that affects your body in many ways. A typical cycle runs from the first day of one period to the first day of the next and averages 28 days, though cycles between 21-35 days are considered normal.
Tracking your cycle helps you understand your body's patterns, predict future periods, identify your fertile window, and notice any changes that might indicate health issues. Our tracker makes this process simple and informative.
The first step is to enter the first day of your most recent period. This is the day when bleeding began, even if it started late in the day. Accurate tracking of this date is crucial for all other predictions.
Always mark the first day of actual bleeding, not spotting. Consistency in how you define the start of your period improves prediction accuracy.
Your cycle length is the number of days from the first day of one period to the first day of the next. If you're not sure about your cycle length, the global average is 28 days, but it's normal to have cycles between 21-35 days. The more you track, the better you'll understand your personal pattern.
For the most accurate predictions, track at least 3 consecutive cycles to establish your personal pattern.
Your period length is the number of days your menstrual bleeding typically lasts. Most periods last between 3-7 days. This information helps create a more complete picture of your cycle and can help identify any changes in your pattern.
Significant changes in period length or flow can sometimes indicate hormonal shifts or health issues worth discussing with a healthcare provider.
After entering your information, our calculator will generate predictions for your next period, ovulation day, and fertility window. The results page provides a clear timeline and detailed explanation of each prediction.
Use the download or share feature to save your results for future reference or to share with your healthcare provider.
For the most accurate predictions, make tracking a regular habit. Update your information each cycle, especially if you notice changes in your cycle length or period duration. The more data you provide, the more personalized and accurate our predictions become.
Let's walk through a sample calculation to help you understand how our tracker works:
Sarah has the following cycle information:
Here are solutions to some common questions and issues users encounter:
If your cycles vary by more than 7-10 days, our predictions may be less accurate. In this case, the tracker can still help you identify patterns and ranges, but you might want to combine it with other fertility awareness methods like basal body temperature tracking for more precision.
Many factors can affect your cycle timing, including stress, travel, significant weight changes, intense exercise, or illness. If your period occasionally varies from the prediction, this is normal. However, if you notice consistent significant changes in your cycle, it may be worth discussing with a healthcare provider.
Our tracker predicts ovulation based on the typical pattern of ovulation occurring 14 days before your next period. However, without physical symptoms or testing, it's difficult to confirm exactly when ovulation occurs. If you're trying to conceive or avoid pregnancy, consider additional methods like ovulation predictor kits or basal body temperature tracking.
This guide and our period tracker are designed for informational purposes only and should not replace professional medical advice. If you have concerns about your menstrual cycle, fertility, or reproductive health, please consult with a qualified healthcare provider.