Free tool
Answer four questions and see your current phase, when your next period is likely due, and what your cycle pattern says about where you are in the transition.
Day one is the first day of real bleeding, not spotting.
First day of one period to the first day of the next.
This is the single most useful thing you can tell me.
Nothing is stored or sent anywhere
Your phase
Tracking symptoms against cycle day is how patterns become obvious. Tap what applies.
Nothing logged yet
This tool is educational. It estimates dates from averages and cannot diagnose anything. Bleeding that soaks a pad an hour, lasts more than seven days, happens more often than every 21 days, or returns after twelve months without a period should be looked at by a clinician promptly.
Next step
Twenty minutes, no cost, no pitch. Bring your cycle dates and whatever labs you have.