Find your most fertile days. Enter the first day of your last period and your average cycle length to see your ovulation window, fertile days, and next period — with a visual calendar.
A typical cycle is 28 days, but anywhere from 21–35 is common. We estimate ovulation about 14 days before your next period.
Fertile window
Most fertile / ovulation
Next period expected
Best days to try to conceive:
Fertile window
Ovulation (most fertile)
Expected period
Tips if you're trying to conceive
- Have sex every 1–2 days during your fertile window — sperm can live up to ~5 days.
- The 2–3 days before and the day of ovulation are the most fertile.
- Track a few cycles; ovulation timing can vary month to month.
- Ovulation predictor kits or tracking basal body temperature can help confirm timing.
- Support your body with a balanced diet, a prenatal vitamin with folic acid, and stress management.
Read Getting Pregnant articles →
This is an estimate based on your cycle and is not a substitute for medical advice or contraception. Cycles vary — talk to your doctor if you have questions about fertility or irregular cycles.