Free, anonymous calculators for your period, fertility, and cycle health. No sign-up. No app. Just answers.
Track your period, predict your next one, and understand what's normal.
When is your next period due? Enter your last period date and cycle length.
How many days late are you — and what does it mean? Calm, factual answers.
Compare your cycle length and period duration to population averages.
Light, medium, or heavy? See how your flow compares and when to seek advice.
How does your cycle change from your teens through to perimenopause?
Ovulation windows, fertile days, and contraception guidance.
PMS, sleep, exercise, and cycle syncing — understand how your cycle affects everything.
Score your PMS symptoms and see how they compare. Know when it crosses the line into PMDD.
What phase are you in? Get tailored energy, mood, food, and exercise tips for each phase.
The best workouts for each phase of your cycle — work with your hormones, not against them.
How your cycle affects sleep quality — and what to do in each phase to sleep better.