Ovulation Calculator
Estimate your most fertile days and ovulation date based on your menstrual cycle. Enter the first day of your last period and your cycle length to see your fertile window and next period date.
Ovulation Calculator
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How It Works
Formula
Ovulation Day ≈ LMP + (Cycle Length − 14) Fertile Window = 5 days before to 1 day after ovulation
Examples
LMP Jan 1, 28-day cycle
Ovulation around January 15.
Frequently Asked Questions
When am I most fertile?
Your most fertile window is the 5 days leading up to ovulation plus the day of ovulation itself. Ovulation typically occurs about 14 days before your next period.
How accurate is an ovulation calculator?
It provides an estimate based on average cycles. Actual ovulation can vary. For greater accuracy, combine it with ovulation predictor kits or basal body temperature tracking.
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