"What phase am I in right now?" is one of the questions we hear most often. And honestly: nobody should have to do that math in their head. So we built a small free tool.
What the calculator does
You enter two things: the first day of your last period and your cycle length (28 days is an illustrative default if you do not know it). The Cycle Phase Calculator then shows you:
- Your estimated current cycle day on a cycle wheel with all four phases
- Your estimated phase today — menstruation, follicular, ovulation or luteal
- Three food ideas associated with that estimated phase
- When your next period is likely to start
No account, no app, no email address. Use the result as orientation; it cannot confirm ovulation.
Why this is more than a gimmick
Hormones change across an ovulatory cycle, and some people notice changes in appetite or other experiences. The review of cycle-related energy intake, PMID 36367830 describes variable findings rather than a fixed 100–300 kcal increase for everyone. A calendar cannot explain every change in how you feel.
The calculator uses the most important rule of thumb in cycle math: the model assumes a luteal phase of around 14 days, although its actual length varies, so ovulation ≈ cycle length minus 14. On a 32-day cycle, the model places estimated ovulation around day 18 — not day 14, as often assumed.
An honest caveat belongs here too: every calculation is an estimate based on averages. Stress, sleep or illness can shift ovulation by days. The calculator is orientation, not contraception.
Try it
→ To the Cycle Phase Calculator — takes less than ten seconds.
On the same page we explain the four phases, hormonal changes and food ideas without assuming everyone feels the same way. For an estimated fertile window, use the separate ovulation calculator, which has the same limits and is not a contraceptive method.
The Bauchgefühl app offers cycle tracking and recipes by cycle phase. Calendar-based phase estimates do not automatically detect actual ovulation.
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