Use our Menstrual Cycle Calculator to estimate your next period, ovulation day, and fertile window. Enter the first day of your last period and your average cycle length to get instant results. This tool is private, free, and works for both regular and irregular cycles. Suitable for users in Australia and worldwide.
Menstrual Cycle Calculator – Track Period & Ovulation
Plan your month with confidence. This menstrual cycle calculator helps you estimate your next period, ovulation day, and fertile window. Just enter the first day of your last period, your average cycle length, and your period length. You’ll instantly see predictions for the next months, including a detailed calendar of fertile days.
How it works
- Select the first day of your last period.
- Enter your average cycle length (e.g., 28 days).
- The tool estimates your next period, ovulation, and most fertile days.
- Results are estimates; cycle length, stress, travel, or health factors can shift dates.
Menstrual Cycle Calculator
Plan around your period, ovulation, and fertile window. For information only.
Disclaimer
This calculator provides general estimates based on averages. It is not a medical tool and should not replace professional medical advice. For personal guidance, consult your doctor or gynecologist.
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Tip: Pair this tool with our BMI Calculator and Daily Fitness Calculator to tailor your training and nutrition through each phase of your cycle.