Next Ovulation Date Estimator

Predict your next 3 ovulation dates with a margin. Free, private and instant.

How to use the Next Ovulation Date

  1. Pick first day of your last period.
  2. Enter average cycle length (days).
  3. Choose luteal phase (ovulation to next period): 10 days, 11 days, 12 days, 13 days and more.
  4. Choose how regular are your cycles?: Very regular (within 1 day), Mostly regular (within 3 days) or Irregular (varies by 5+ days).
  5. Press Calculate to get an instant result with a colour scale, chart and plain-English explanation.

About the Next Ovulation Date

Estimate when you will ovulate in each of your next three cycles, with a margin that matches how regular your periods are. It also suggests the day to begin using ovulation (LH) test strips.

Also known as: next ovulation calculator, future ovulation dates, ovulation predictor.

Worked example

Dates in this example are worked out as if today were 5 Nov 2026.

Next ovulation in about: 0 days (Around 5 Nov 2026). Your next ovulation is estimated for Thu, 5 Nov 2026.

Formula and cut-offs

Ovulation = cycle start + cycle length - luteal phase. The range is widened by 1, 3 or 5 days depending on how regular your cycles are.

Frequently asked questions

When will I ovulate next?

About 14 days before your next period. Enter your last period date and cycle length for an estimate.

How accurate is the estimate?

It is precise for very regular cycles and less so when cycles vary. Ovulation tests give a confirmation.

When should I start ovulation tests?

Start 2 to 3 days before the earliest likely ovulation day.

Sources and references

Written and checked by the MediHub editorial team against the sources above. Read how we build and review our calculators.

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Last updated . This calculator is for education only and is not medical advice. See the medical disclaimer.