Ovulation & Due Date Calculator - Free Online | FunToolX
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Ovulation & Due Date Calculator
Estimate ovulation, fertile window and due date from your last period and cycle length. For reference only — not medical advice.
About this tool
Ovulation & Due Date Calculator is a free online tool. Estimate your ovulation window, fertile days and due date from your last period and cycle length.
Enter the last menstrual date and average cycle length to automatically calculate the ovulation period, safety period, and expected date of delivery. The results are displayed in calendar form, visually marking each stage.
Calculations are based on standard physiological formulas, ovulation date = 14 days before the next menstruation, and expected date of delivery = last menstruation + 280 days. All calculations are done on the browser side and data will not be uploaded.
It is suitable for pregnant women to understand their physiological cycle, and it is also suitable for pregnant mothers to estimate the expected date of delivery. The results are for reference only and cannot replace a doctor's diagnosis.
The ovulation period and expected date calculation tool calculates key dates based on the date of the last menstrual period and cycle length.