Perimenopause Cycle Tracker
Log period start dates; the tracker computes cycle lengths, applies the STRAW+10 rules to your real data — recurring 7-day swings, 60-day skips, 12 months without — and follows your stage as it changes. Saved on this device, monthly.
Where the rules put you
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Common questions
How many cycles should I log?
At least three or four — the STRAW+10 rules are about change between consecutive cycles, so two periods can only hint. Six months of logs makes the stage call genuinely trustworthy.
Is this a diagnosis?
No — it's the same STRAW+10 cycle rules the stage calculator asks you about, applied to dates you actually logged. Skipped periods have other causes (pregnancy, thyroid, stress, medications); the rules only mean something in context.
Where is my data stored?
In your browser's local storage, like every tracker on this site — nothing leaves your device, and clearing site data clears the log.
Method
Cycle length = days between consecutive period starts. STRAW+10 rules applied in order: no period for 12+ months → postmenopause; any 60+ day gap in the log → late menopausal transition; recurring differences of 7+ days between consecutive cycles → early transition; otherwise, regular cycles at 40+ reads as the late reproductive stage. The framework is retrospective by design — the final period is only confirmed looking back. Heavy bleeding, spotting between periods, or gaps under 35 with flooding are worth a clinician visit on their own, whatever the stage says.
Same log, other views: period calculator · ovulation calculator
The rule-based version: stage calculator · symptom diary · symptom score