Ovulation Calculator
Accurately predict your fertile window, ovulation date, and next period based on your menstrual cycle
Calculate Your Ovulation
Days between ovulation and next period
Your Results
Next Period:
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Ovulation Date:
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Fertile Window:
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Next Fertile Days:
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Menstrual Cycle Overview
Normal Days
Fertile Window
Ovulation Day
Frequently Asked Questions
How is the ovulation date calculated?
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The ovulation date is calculated by subtracting the luteal phase length (typically 14 days) from your next expected period date. For example, if your cycle is 28 days, ovulation occurs around day 14.
What is the fertile window?
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The fertile window includes the 5 days before ovulation and the day of ovulation itself. This is the time when you're most likely to conceive. Sperm can survive in the female reproductive tract for up to 5 days.
How accurate is this ovulation calculator?
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Our calculator is highly accurate for women with regular cycles. However, ovulation can be affected by stress, illness, travel, and other factors. For best results, track your basal body temperature and cervical mucus along with using this calculator.
Can I use this calculator to avoid pregnancy?
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While understanding your fertile window can help with natural family planning, this method alone is not the most reliable form of contraception. We recommend using additional protection or consulting with a healthcare provider for birth control advice.