How to Use This Calculator
- Enter Cycle Length (days).
- Enter Current Cycle Day.
- Click Calculate to view the result.
- Review the calculated result shown below the form.
- Use Reset to clear the values and start again.
Health
Ovulation Calculator
Estimate ovulation day from cycle length and day of cycle.
Formula
Days until ovulation=
Cycle Length (days) − 14 − Current Cycle Day