Ovulation date
First day of last period (mm/dd):
Days in menstrual cycle:
Length of luteal phase (if known):
Next Period:  
Range Begin:  
Range End:  
Natural Standard Monograph, Copyright 2011 (www.naturalstandard.com). Commercial distribution prohibited. This calculator is intended for informational purposes only, and should not be interpreted as specific medical advice. A qualified healthcare provider should be consulted before making decisions about therapies and/or health conditions.