How to Calculate Your Menstrual Cycle

Hands holding a smartphone showing a menstrual cycle calendar
Woman looking down at her phone smiling with the text track your menstrual cycle
Image showing a calendar explaining how to calculate cycle length
Illustration of day one marked in a calendar as the start of the period
A hand inserting a smartphone in a pocket with writing predict your next period
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1. Calculate your menstrual cycle
2. How to count the days in your menstrual cycle
3. Calculating your average menstrual cycle length
4. How to know when your next period is due

Knowing when you’re going to get your period is pretty helpful. Maybe you’re planning a day at the beach. Maybe you have a sleepover with friends coming up. Or maybe you just want to know when to stash some extra pads in your bag, so you’re not caught off guard by your monthly flow. Knowing how to calculate your menstrual cycle is easy and can give you a peace of mind. So, here’s how to do it.

01 Calculate your menstrual cycle

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02 How to count the days in your menstrual cycle

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03 Calculating your average menstrual cycle length

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04 How to know when your next period is due

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Period Tracker

Track your period

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