Loading Legacy
Key Dates
Ovulation Date
May 20, 2026
Fertile Window
May 15 – May 21
Next Period
Jun 3, 2026
Peak conception days: The 2–3 days immediately before ovulation (May 17–May 19) plus ovulation day itself (May 20) offer the highest likelihood of conception.
Next 3 Cycles
| Cycle | Period Start | Ovulation | Fertile Window Starts |
|---|---|---|---|
| Cycle 1 | Jun 3, 2026 | Jun 17, 2026 | Jun 12, 2026 |
| Cycle 2 | Jul 1, 2026 | Jul 15, 2026 | Jul 10, 2026 |
| Cycle 3 | Jul 29, 2026 | Aug 12, 2026 | Aug 7, 2026 |
Disclaimer: This calculator uses the standard Ogino-Knaus method assuming a regular cycle. Actual ovulation varies. Not a substitute for medical fertility advice or contraception.
Ovulation Calculator estimates your next ovulation day and 6-day fertile window from your last period and cycle length, and projects the fertile windows for the next 3 cycles.
Ovulation Calculator is a high-performance utility designed to help users streamline their workflow. Built with modern web technologies, it ensures fast processing times and high-quality outputs directly in your browser.
Ovulation is estimated to occur 14 days before the next period: ovulation date = LMP + cycleLength − 14. The fertile window spans ovulation − 5 days to ovulation + 1 day (6 days total). Projections for subsequent cycles repeat the same interval. This is an estimate based on cycle regularity; use clinical ovulation testing for confirmed timing.
Ovulation typically occurs 14 days before your next period, not 14 days after your period starts. For a 28-day cycle, that's Day 14. For a 32-day cycle, it's around Day 18.
The fertile window spans approximately 6 days: the 5 days before ovulation plus the day of ovulation. Sperm can survive up to 5 days in the reproductive tract, so intercourse before ovulation can still result in conception.
The 2–3 days before ovulation and the day of ovulation are when pregnancy is most likely. An egg survives only 12–24 hours after release, so timing intercourse around ovulation is key.
This calculator assumes a regular cycle length. For irregular cycles (varying by more than 7 days), ovulation timing is less predictable — consider ovulation predictor kits (OPKs) or basal body temperature (BBT) tracking for better accuracy.