The calculator estimates your next period based on your LMP and cycle length. It then counts back 14 days from the next period to determine your approximate ovulation date. The "fertile window" is the 6-day period that includes the 5 days before ovulation plus the day of ovulation itself. Sperm can survive in the female reproductive tract for up to 5 days, so intercourse during this window gives the highest chance of conception.
This calculator provides an estimate and works best for women with regular menstrual cycles. Cycle length and ovulation timing can be affected by factors like stress, diet, and health conditions. For greater accuracy, consider tracking your cycle with other methods, such as using ovulation predictor kits (OPKs) or monitoring your basal body temperature (BBT).
This tool is for informational purposes only and should not be considered a substitute for professional medical advice. For family planning and health concerns, always consult with a qualified healthcare provider.