Knowing how to calculate periods is something that every woman should do — from teens on their first menstruation to older women who are nearing menopause. If you know when your next period would arrive, you can predict when you would ovulate and have higher chances of getting pregnant. This is important whether you’re trying to conceive or want avoid pregnancy. Calculating your periods will also help you prepare for them and ensure you’re not too busy during the days when you’re menstruating.

If you don’t know how to predict your periods, this infographic is for you! We’ve listed some techniques that you can use to track your menstrual cycle and calculate when your next period will arrive.

Infographic by Menstrual Cycle Calculator