Your cycle phase, today.
A simple awareness tool: estimate which phase of your cycle you are likely in, and what is generally happening hormonally. For understanding your rhythm - not for planning or preventing pregnancy.
Free access to the Cycle Phase tool.
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Method & sources
From the first day of your last period and your average cycle length, we estimate today's cycle day (days since that date, wrapped to your cycle length). Because the luteal phase is relatively fixed at about 14 days, ovulation is estimated as roughly your cycle length minus 14 - so it is the follicular phase that stretches or shrinks with cycle length. Phases are mapped as menstrual (about days 1–5), follicular, a short ovulatory window around length−14, and luteal. Calendar estimates are approximate and are unreliable for preventing or planning pregnancy.
- NIH Office on Women's Health - Your Menstrual Cycle.
- NIH NICHD - Menstruation (typical cycle length 21–35 days in adults).
- Cleveland Clinic - Menstrual Cycle (phases and hormones).
- ACOG - Your Menstrual Cycle (patient FAQ). Note: fertility-awareness contraception requires formal training and is not what this tool provides.
The four phases.
A typical cycle runs in four phases driven by shifting hormones. Knowing roughly where you are can help you make sense of changes in energy, sleep, and mood across the month. The boundaries below are general estimates - everyone is different.
- Menstrual (about days 1–5): your period. Hormones are at their lowest; energy can dip for some.
- Follicular (after your period to mid-cycle): estrogen rises; many people notice steadier or rising energy and mood.
- Ovulatory (around mid-cycle): estrogen peaks; some feel their most energetic. This is a rough estimate, not a fertility prediction.
- Luteal (second half): progesterone rises then falls; some notice lower energy or PMS-type changes before the next period.
What this tool isn't
It is general education for cycle awareness - not a medical tool, not a diagnosis, and not a method of contraception or conception. Hormonal birth control also changes or removes these phases. If you're tracking for pregnancy-related reasons or have concerns, please work with a healthcare provider.