Safe Period Calculator / Ovulation Calculator
The Safe Period Calculator helps women accurately calculate ovulation, safe period, and menstrual period based on their cycle.
How to Use
- Enter the date of your last period.
- Enter your average cycle length (usually 28 days).
- Click "Calculate" to get the dates for ovulation, safe period, and menstrual period.
Principle
- Ovulation usually occurs about 14 days before the next period.
- The safe period is divided into pre-ovulation and post-ovulation safe periods.
- The calculator automatically estimates each phase based on your input.
Formula
- Ovulation period = About 14 days before next period.
- Pre-ovulation safe period = End of menstruation to start of ovulation.
- Post-ovulation safe period = End of ovulation to start of next period.
This tool is for reference only and not medical advice.