Ovulation Calculator

Find your fertile window.

Ovulation around day 14

Fertile window opens (day) 11

Fertile window closes (day) 15

Step-by-step with your numbers:

1. Values used:

2. Cycle length = 28 days

3. Days since last period = 5 days

4. Ovulation around day = 14

5. Fertile window opens = 11day

6. Fertile window closes = 15day

Did we solve your problem today?

Ovulation ≈ cycle length − 14 days. Informational only.

FAQ

Varies?

Cycle length can vary — tracking methods improve accuracy.