Ovulation Calculator
Calculate your fertile window and ovulation date. Enter the first day of your last period and average cycle length to find the best days to conceive.
The first day of your most recent menstrual period
Average days from first day of one period to first day of next
Days from ovulation to next period (typically 12-16 days)
When is the best time to get pregnant?
The best time to conceive is during your fertile window - the 5 days before ovulation and the day of ovulation. The 2-3 days before ovulation are the most fertile. Sperm can live up to 5 days, so having intercourse before ovulation increases conception chances.
How do I know when I ovulate?
Ovulation typically occurs 14 days before your next period. Signs include changes in cervical mucus (clear and stretchy), slight temperature increase, mild cramping, and increased libido. Ovulation predictor kits (OPKs) can confirm ovulation by detecting the LH surge.
How accurate is this ovulation calculator?
This calculator provides estimates based on average cycle patterns. Actual ovulation can vary by a few days due to stress, illness, or hormonal changes. For precise tracking, use ovulation predictor kits, basal body temperature charts, or fertility monitors.
What if my cycle is irregular?
If your cycle varies by more than 7-9 days month to month, this calculator will be less accurate. Track your cycles for 3-6 months to find an average, use OPKs to detect ovulation, or consult a healthcare provider about irregular cycles.