Period
Tracker for Women
Track and predict your upcoming menstrual cycles with this free period calculator. Get accurate predictions for your next several periods based on your cycle length.
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How This Period Works
Enter the first day of your last period and your average cycle length. The tracker calculates your next several expected periods by adding your cycle length to each previous start date. For best accuracy, track your cycles for 3-6 months to determine your true average length.
When Should You Use This Tool
Use this period tracker monthly to plan ahead for travel, events, or medical appointments. Regular tracking helps identify patterns in your cycle and spot irregularities early. Women with consistent cycles between 21-35 days see the most accurate predictions.
Is This Tool Accurate and Safe
This tracker provides estimates based on your reported cycle length. Individual cycles can vary by several days due to stress, illness, exercise, or hormonal changes. If your cycles frequently differ from predictions, consult a healthcare provider. All data stays private in your browser.
Frequently Asked Questions
What is a normal menstrual cycle length for women?
Normal cycles range from 21 to 35 days. The average is 28 days, but many healthy women have shorter or longer cycles. Consistency matters more than hitting exactly 28 days.
Why should women track their period?
Tracking helps you understand your body's patterns, plan activities around your cycle, identify irregularities early, and provide accurate information to healthcare providers when needed.
What causes irregular periods in women?
Common causes include stress, significant weight changes, excessive exercise, hormonal imbalances, PCOS, thyroid issues, and perimenopause. Occasional variation is normal, but persistent irregularity warrants medical attention.
How many days does a normal period last?
Most periods last 3-7 days. Flow is typically heaviest in the first 2-3 days. Periods shorter than 2 days or longer than 7 days may indicate hormonal imbalances worth discussing with a doctor.