Ovulation & Fertility Calculator

Track your fertile window, predict ovulation dates, and maximize your chances of conception.

Ovulation Calculator

Please select a valid date
Average cycle length is 28 days
Average luteal phase is 14 days
Average period is 5 days

Your Fertility Details

Next Period Date
--/--/----
Day X of your cycle
Estimated Ovulation Date
--/--/----
In X days
Fertile Window
--/--/---- to --/--/----
Your most fertile days
Conception Probability
XX%
High

Fertility Status

You are in your fertile window. This is the best time to try to conceive.

Conception Probability Guide

  • High probability (20-33%): 1-2 days before ovulation
  • Medium probability (10-20%): 3-5 days before ovulation
  • Low probability (0-10%): Outside fertile window
  • Peak fertility occurs on the day before ovulation

Fertility Calendar

Your fertility status for this cycle:

Sun Mon Tue Wed Thu Fri Sat

Cycle History

Understanding Ovulation & Fertility

An ovulation calculator helps identify your fertile window based on your menstrual cycle information. Key aspects include:

  • Ovulation Date - When an egg is released from your ovary
  • Fertile Window - The 5-6 days leading up to ovulation
  • Conception Probability - Likelihood of pregnancy on specific days
  • Fertility Calendar - Visual representation of your cycle

How It Works

Ovulation calculators use the first day of your last menstrual period (LMP) and cycle length to predict fertility:

Ovulation Date = LMP + (Cycle Length - Luteal Phase)
Fertile Window = Ovulation Date - 5 days to Ovulation Date + 1 day

Conception probability is highest during the fertile window, peaking 1-2 days before ovulation.

Period
Fertile Window
Ovulation
Next Period

Important Notes

Keep in mind that:

  • Ovulation prediction is an estimate and may vary
  • Cycle irregularities can affect accuracy
  • Track basal body temperature for more precise results
  • Consult a fertility specialist if trying to conceive for over 6 months

Fertility Boosting Tips

To increase your chances of conception:

  • Have intercourse every other day during your fertile window
  • Maintain a healthy weight and balanced diet
  • Limit caffeine and avoid alcohol
  • Manage stress through relaxation techniques
  • Consider ovulation predictor kits for accuracy