How to track your cycle without an app

You can track your cycle without an app. You need two things: somewhere to write down the first day of bleeding, and something that'll still exist in two years.

That's the whole method. The rest of this is what to record beyond the bare minimum, and what the record tells you once you've kept it a while.

Why apps guess

Cycle apps are good at reminders. The prediction they show you is a projection built from an average, so for anyone whose cycle isn't tidy, which is most of us at some point, it's confidently wrong in a way a written record never is.

What to write down

Less than you'd expect. The first day of bleeding is the one that counts. Mark that and nothing else and you'll have something useful inside six months.

If you want more than the minimum:

• Day one, every time.
• How many days it lasted.
• Heavier or lighter than usual, in whatever shorthand suits you.
• Anything that knocked the month sideways: illness, travel across time zones, a stretch of bad sleep, a change in medication.

People skip that last one and then wish they hadn't. A cycle that looks erratic on its own often makes complete sense once you can see that three of those months had something else going on.

What six months tells you

Your real cycle length, as opposed to the twenty-eight days you were taught at school. Very few people run to twenty-eight, and the normal range is wide.

You'll also see how much yours varies. Some people land within a day either side every month. Some swing by a week and always have. Both can be perfectly ordinary, and you only find out which one you are by writing it down.

What two years tells you

This is where paper pulls away from an app you'll have deleted and reinstalled twice by then.

Two years shows change over time: after a baby, after a house move, after a hard year at work, after starting or stopping something. A vague sense that things are different becomes a page you can look at.

It's also what makes a GP appointment worth having. Nobody can do much with "it's been a bit odd lately". Most people can do something with a page of dates.

A record isn't a diagnosis, and none of this is medical advice. If something about your cycle worries you, has changed noticeably, or hurts enough to interfere with your day, see your GP. The record just means you walk in with better information.

Why paper wins on privacy

Cycle data is health data, and health data inside an app sits on somebody else's server under terms that can change. Companies get sold. Policies get rewritten in an update nobody reads.

A sheet in a zip case has no account, no sync and no breach to worry about. Plenty of people are relaxed about app data, which is a fair position. If you aren't, paper is the version that never asks.

Making the habit stick

It fails for one reason: the thing you write on isn't where you are when you need to write on it.

Keep the record with the supplies. If the calendar is in the same case as the pads, marking the date takes two seconds while the case is already open. Keep it in a drawer at home and you'll mean to do it later.

Every LunnaLu organiser comes with two years of dated sheets, 2026 and 2027, held by elastic opposite the supplies with a permanent marker in its own loop. The sheets are thin plastic rather than paper, so they survive a handbag and the marks don't smudge. The left edge is punched, so you can file each one once it's full.

If you're setting one up for a daughter, there's a separate piece on what to put in a period kit for school.