Home Ovulation calculator
Ovulation calculator
Press Cycle ＋ 1 day, Today ＋ 1 day, Luteal 12 days, 32-day cycle, or 2026-06-18. From 2026-06-01 on a 28-day cycle, today 2026-06-10 ovulates on 2026-06-15, in 120:00:00.
Change the last period, cycle, luteal phase, and today. Press Cycle ＋ 1 day, Today ＋ 1 day, Luteal 12 days, 32-day cycle, or 2026-06-18 and the large time, such as 120:00:00, changes at once.
Until ovulation, or the next period
120:00:00
2026-06-15 · 2026-06-29 · 120:00:00
- Ovulation
- 2026-06-15
- Next period
- 2026-06-29
- Fertile start
- 2026-06-10
- Cycle
- 35.71%
- Until ovulation, or the next period
- Fertile window
- Until next period
- 456:00:00
Dates in this cycle
| Bleeding ends | 2026-06-05 |
|---|---|
| Fertile start | 2026-06-10 |
| Ovulation | 2026-06-15 |
| Next period | 2026-06-29 |
Recent
Why this exists
The due-date page names a birth date. This page counts one luteal phase back from the next period and names ovulation.
From 2026-06-01 on a 28-day cycle, today 2026-06-10 ovulates on 2026-06-15. The fertile window opens five days earlier, on 2026-06-10. This is not birth control and not a promise of pregnancy.
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01How to use it
Press Period ± 1 day, Today ± 1 day, Cycle ± 1 day, Luteal ± 1 day, Bleeding ± 1 day, a 26-, 28-, 30-, or 32-day cycle, Luteal 12, 14, or 16 days, 2026-06-18, or this browser’s today. The large time changes at once.
The sample is 2026-06-01, 28 days, luteal 14, bleeding 5, today 2026-06-10. Cycle ＋ 1 day is 2026-06-16. Today ＋ 1 day leaves 96:00:00. 2026-06-18 leaves 264:00:00. Copy takes that table.
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02What you get
The large text is 120:00:00. Beside it are ovulation 2026-06-15, the next period 2026-06-29, and fertile start 2026-06-10.
Today is 35.71% of the way through the cycle. Recent results stay in this browser.
Entered2026-06-01
Cycle ＋ 1 day 2026-06-16 Today ＋ 1 day 96:00:00 Luteal 12 days 2026-06-17 2026-06-18 264:00:00 -
03Worth knowing
The fertile window runs from five days before ovulation through ovulation day. Sperm can last several days and the egg about a day. A luteal phase is often 12–16 days, and a longer cycle adds days before ovulation, not after it.
A cycle that swings widely, the months after birth, feeding a baby, or polycystic ovary syndrome makes a calendar too thin. This is not a diagnosis. Nothing is sent to a server.
Questions
- QWhat is 2026-06-15?
- AOvulation on a 28-day cycle when today is 2026-06-10.
- QWhat is 120:00:00?
- AThe wait until that ovulation. Five days is 120:00:00.
- QWhat is 2026-06-16?
- AOvulation after stretching the cycle to 29 days.
- QWhat is 264:00:00?
- AThe wait from 2026-06-18, after ovulation, until the next period.