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排卵日计算器

根据末次月经第一天和平均周期估算排卵日和易孕期。仅供教育用，不能替代医疗建议。

默认为您所在地区。可切换以比较其他标准。

Assumes a typical ~14-day luteal phase (ovulation ≈ cycle length − 14). Luteal length can vary by a few days between people and cycles.

天

From the first day of one period to the day before the next. Typical range about 21–45 days.

结果

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估计排卵日

Enter the first day of your last period

    Educational estimate

    仅供教育用的日历估算，非医疗建议。月经不规律、多囊卵巢或正在接受生育治疗时请咨询医生。

    公式

    • Ovulation day ≈ LMP + (cycle length − 14)
    • Fertile window ≈ ovulation − 5 days through ovulation day
    • Next period ≈ LMP + cycle length
    • Estimated due date (if conception on ovulation) ≈ ovulation + 266 days
    • Assumes a typical ~14-day luteal phase; individual luteal length varies

    计算方法

    1. Enter the first day of your last menstrual period (LMP).
    2. Set your average cycle length (default 28; typical range about 21–45 days).
    3. Read the estimated ovulation date (primary result).
    4. Check the fertile window, next period, cycle day of ovulation, and optional due-date estimate.
    5. Treat results as a guide only — confirm with a clinician if cycles are irregular or you are in treatment.

    常见问题

    How is ovulation estimated?

    Calendar methods place ovulation about 14 days before the next period. With your average cycle length C, that is LMP + (C − 14). The fertile window is about the five days before ovulation through ovulation day, because sperm can live up to ~5 days and the egg about a day.

    Is this medical advice or a fertility diagnosis?

    No. This is an educational calendar estimate only. It cannot confirm ovulation, diagnose infertility, or replace LH strips, ultrasound, or a clinician. Seek medical care for irregular cycles, PCOS, endometriosis, or fertility treatment.

    What if my cycle is irregular or I have PCOS?

    Calendar estimates work best with fairly regular cycles. Large cycle-to-cycle swings, PCOS, recent hormonal contraception, breastfeeding, or perimenopause make the dates unreliable. Track symptoms or use ovulation tests and discuss planning with a clinician.

    Why is the luteal phase fixed at 14 days?

    After ovulation, the time until the next period is often the steadiest part of the cycle and averages about two weeks in many people. Teaching materials and ACOG-style fertility-awareness explanations therefore use ~14 days before the next period as a simple rule of thumb. Your own luteal length can be a few days shorter or longer.

    How does this relate to the pregnancy due-date calculator?

    If conception happens on the estimated ovulation day, adding 266 days gives an estimated due date (the same convention as dating from conception). For full pregnancy dating — including LMP + 280, IVF transfers, gestational age and leave dates — use the pregnancy due-date calculator.

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