Luteal Phase Calculator

Your details

Exact mode uses your actual ovulation and period dates. Estimate mode predicts your luteal phase from your last period date and average cycle length.
The day you ovulated, confirmed by LH surge, basal body temperature rise, or ultrasound.
The first day of full menstrual bleeding after ovulation.
Luteal phase lengthNormal luteal phase
14days

Days from ovulation to the day before your next period

AssessmentNormal (12-16 days)
Ovulation dateAug 28, 2026
Luteal phase startAug 28, 2026
Luteal phase endSep 10, 2026
Next period dateSep 11, 2026
14 days
Short<11Normal11-16Long16+

Your luteal phase is 14 days - within the normal range.

  • Your luteal phase is 14 days, which falls in the normal 12-16 day range. This means progesterone is likely sustaining the uterine lining adequately.
  • A healthy luteal phase supports implantation if fertilization has occurred. During this time, progesterone levels rise then fall, triggering menstruation if pregnancy does not occur.

Next stepYour luteal phase looks healthy. Continue tracking your cycle to spot any trends over time.

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