🩸 Period Calculator

Track Your Menstrual Cycle & Predict Your Next Period

Calculate your next period date, ovulation day, and fertile window based on your cycle history.

Enter Your Cycle Information

Last Period Start Date *

Average Cycle Length (days) *

Normal range: 21-40 days

Period Length (days)

Typical range: 2-8 days

Your Cycle Predictions

Next Period

Ovulation Date

Fertile Window

6-day window

Period Days

Fertile Window

Ovulation Day

Frequently Asked Questions

⚠️ Important Disclaimer

This period calculator provides estimates based on average menstrual cycle patterns and should not be used as a contraceptive method. Results are for informational purposes only and do not constitute medical advice. Individual cycles can vary due to many factors including stress, illness, lifestyle changes, and underlying health conditions. For irregular periods, fertility concerns, or any menstrual health issues, please consult with a qualified healthcare provider.