Period & Ovulation Calculator
Track your menstrual cycle, pinpoint ovulation, and discover your peak fertile window with clinical precision.
Upcoming 3-Cycle Forecast
| Cycle | Period Dates | Fertile Window | Ovulation |
|---|
--
Cycle day: -- / -- (--)
Your body is shedding its uterine lining (endometrium) and resetting for a fresh cycle.
Your body is preparing for ovulation as estrogen rises and ovarian follicles mature.
A surge in luteinizing hormone (LH) triggers one of your ovaries to release a mature egg.
Your body boosts progesterone to thicken the uterine lining for potential implantation.
Chance of pregnancy: Low Medium to high Very high High to low
Chance of becoming pregnant is low during bleeding, though not zero in shorter cycles.
Chances start to climb steadily as you approach your fertile window.
You are at peak fertility and most likely to conceive during this window.
Chances decrease rapidly after the egg window closes toward the end of the phase.
Next ovulation starts: --
Peak fertility window with the highest probability of conception.
Next cycle starts: --
Your menstrual cycle resets and begins Day 1 of the next period.
Your period is proof of your body doing something incredible
Prepping for the next big event: Ovulation & rising energy
The main event of your cycle is here!
It's all about "get ready, nourish... or reset"
Saying goodbye to last month’s uterine lining.
Pituitary gland sends signals to grow ovarian follicles.
A mature egg is released and travels down the fallopian tube.
Corpus luteum produces progesterone to support pregnancy or trigger reset.
Estrogen and progesterone are at baseline. Bleeding lasts 3–7 days. Prioritize hydration, iron-rich foods, gentle stretching, and rest.
Rising estrogen boosts mood, skin glow, and stamina. Cramps fade away—ideal for strength training and creative work.
Peak fertility days. You may notice heightened energy, higher libido, and clear, stretchy cervical fluid.
Progesterone peaks then drops if no conception occurs. You may notice bloating, breast tenderness, or PMS—focus on complex carbs and sleep.
