A normal menstrual cycle ranges from 21-35 days, counting from the first day of one period to the first day of the next. The average is 28 days, but every woman's cycle is unique. Cycles may vary due to stress, diet, exercise, or health conditions.

Essential hygiene practices include:

• Change products every 4-6 hours (pads/tampons)
• Wash hands before/after changing products
• Clean genital area twice daily with water
• Wear clean cotton underwear
• Dispose of products properly
• Stay hydrated and eat nutritious foods

Reusable cloth pads are eco-friendly alternatives that last 2-5 years:

1. Choose appropriate absorbency
2. Attach to underwear with snaps/wings
3. Change when full (4-6 hours)
4. Rinse immediately in cold water
5. Wash with mild soap (hand or machine)
6. Air dry completely before reuse

The calculator provides estimates based on your average cycle length. Accuracy depends on cycle regularity - factors like stress, illness, or lifestyle changes can affect your cycle. Tracking your actual periods helps improve predictions.

Benefits include:

• Savings: Cost-effective long-term
• Eco-friendly: Reduces waste
• Comfort: Softer, breathable materials
• Health: Fewer chemicals, less irritation
• Convenience: Always available

Proper care extends pad life:

1. Rinse immediately after use
2. Soak in cold water with vinegar for stains
3. Wash with mild detergent (no softeners)
4. Sun dry for natural disinfection
5. Store in clean, dry place

For irregular cycles (varying by 7+ days):

• Track cycles for several months
• Maintain healthy lifestyle
• Manage stress effectively
• Achieve healthy weight
• Consult a doctor if issues persist

Possible causes include PCOS, thyroid issues, or perimenopause.