Track your cycle and identify your most fertile window.
Enter cycle details to predict
Ovulation typically happens about 14 days before your next period starts. This calculator looks backward from your expected next period date to find this "release day."
Note: This assumes a regular cycle. If your cycle length varies significantly (e.g., 25 days one month, 35 the next), calculations will be less accurate.
Your "Fertile Window" is the 6-day interval when pregnancy is possible. It includes:
Having intercourse during the 2-3 days leading up to ovulation offers the highest chance of conception.
Your resting temperature rises slightly (about 0.5°F) right after ovulation occurs.
Look for "egg white" consistency—clear, stretchy mucus indicates high fertility.
It is extremely unlikely. The egg disintegrates within 24 hours if not fertilized.
Ovulation calculators are best for regular cycles. If you are irregular, consider using Ovulation Predictor Kits (OPKs) which test hormone levels in urine.
