Your Fertility & Ovulation Calculator
Plan with confidence, understand your cycle.
Fertility Calendar
Track your cycle and predict your fertile window.
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Frequently Asked Questions
What is the fertile window?
The fertile window is the 6-day period each month when pregnancy is possible. It includes the 5 days leading up to and including ovulation day.
How does this calculator predict my cycle?
It uses the first day of your last period and your average cycle length to estimate your fertile window and ovulation day based on standard cycle patterns.
What is a typical cycle length?
A typical menstrual cycle lasts between 21 and 35 days, with the average being 28 days.
Is this tool 100% accurate?
No, this is an estimate. It is not a substitute for medical advice or more precise tracking methods like basal body temperature or ovulation predictor kits.
When is ovulation day?
Ovulation typically occurs about 14 days before the start of your next menstrual period.