The Ovulation Calendar Express helps you determine your fertile days of the month, so you can either achieve or avoid pregnancy. The calendar is based on the date of your last period, the average Period Length and the Luteal Phase. With this information a calendar is created for each month, including details such as the next period date, the best days to conceive a boy or a girl, your ovulation day and when you should abstain from intimate relations to avoid pregnancy.
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If you need to save your whole calendar history, you have irregular periods, keep track of your BBT, weight, mood, etc, check out our Ovulation Calendar for Mac which gives you a very rich feature set.