28 day cycle
Expected ovulation: Apr 21, 2026
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Ovulation calculator
Estimate ovulation day and fertile days from the first day of the last period and cycle length.
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Related guide: Understanding pregnancy weeks, ovulation and fertile days
Examples
Typical calculations
30 day cycle
Expected ovulation: Apr 17, 2026
Load this example26 day cycle
Expected ovulation: April 22, 2026
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Frequently asked questions
Is ovulation always exactly 14 days before your period?
No, this is just an approximation. The actual luteal phase may vary.
Can the calculator help with irregular cycles?
Only limited. The more irregular the cycle, the less accurate the estimate.
What is the fertile phase?
As a guide, a time window of a few days before to shortly after ovulation is usually considered.
Can I use this to safely plan or rule out a pregnancy?
No. The calculator only provides guidance.
Why should I observe multiple cycles?
Because the actual cycle length may vary.
When are the most fertile days?
The most fertile days are usually the two days before ovulation and the day of ovulation itself.
How do I recognize ovulation?
Signs can include a change in cervical mucus, a slight pulling sensation in the abdomen and an increase in basal body temperature. Ovulation tests measure the increase in LH hormone.
Can I still get pregnant after ovulation?
The egg cell is only capable of fertilization for around 12 to 24 hours. Immediately after ovulation, the probability drops quickly.
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Sources and notes
Rule status and context
- methodology
- Ovulation approximately 14 days before the next period.