Let’s say, your average cycle length for periods across March to July are 30, 29, 27 and 30. Your average cycle length would be an average of these numbers, that is, 29.

An app is probably an easier option but if you want to figure out your ovulation day yourself, you'll need to chart your menstrual cycle and record how long it lasts. According to Web MD: "Day 1 is ...

Ovulation Calculator: Understanding Your Menstrual Cycle Rebecca Gillie— Parentdish UK 14/10/2014 12:20pm BST Getty ...

There's a lot of information out there about staying on top of your menstrual cycle — here's what you should know.

You can use the baby boy ovulation calculator for twins to calculate when you are ovulating. This tool considers your menstrual cycle length, helping you determine your fertile window.

In a fertility cycle, the ideal size is between 18 and 22 millimeters in diameter. Once a follicle reaches this size, it means estrogen levels are rising and the uterine lining has thickened.