Ovulation Test Calculator
Find your ovulation day, fertile window, and the best day to start ovulation predictor kits (OPKs).
Privacy: All data is calculated locally in your browser. No personal data is stored or sent to any server.
Your fertility dates
Ovulation day (estimated)
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Fertile window
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Best chance when sperm are waiting before the egg is released.
Start ovulation tests (OPK)
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Begin daily OPK testing on this date (5 days before expected ovulation).
Next period (estimated)
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Estimates assume a 14-day luteal phase. Cycles vary; OPKs and cervical mucus can help pinpoint ovulation. Not medical advice.
Fertility tips
- Have intercourse every 1–2 days during your fertile window, especially the 2 days before ovulation.
- Start ovulation predictor kits (OPKs) a few days before your expected ovulation day.
- Track basal body temperature (BBT) after ovulation to confirm your pattern over time.
- Watch for egg-white cervical mucus—it often appears just before ovulation.
- Stress, illness, and travel can shift ovulation; update your dates each cycle.
- Consult your OB-GYN or fertility specialist if you have irregular cycles or difficulty conceiving.