Ovulation Calculator — Quick 8‑Section Guide
1) Core idea
Ovulation typically occurs lutealPhase days before your next period (≈14 by default). We use your last period, cycle length, and optional luteal phase to map fertile days.
2) Flow you can trust
- Enter LMP, cycle length, and optional luteal phase.
- We project the next period, subtract the luteal phase to find ovulation.
- We highlight a 6‑day fertile window: 5 days before ovulation + ovulation day.
3) Sanity checks
- Sperm can live up to ~5 days; the egg ~12–24 hours.
- Luteal phase is usually the most consistent part of the cycle.
4) Shortcuts
- No luteal data? Use 14 days as a reasonable default.
- Best conception odds: 2–3 days before ovulation and on ovulation day.
5) Pitfalls
- Irregular cycles lower prediction accuracy—consider OPKs/BBT tracking.
- Stress, illness, and travel can shift ovulation timing.
6) Micro examples
- 28‑day cycle, LMP Jan 1 → Ovulation ≈ Jan 14; fertile window Jan 9–14.
- 32‑day cycle, luteal 14 → Ovulation ≈ Day 18; fertile window Days 13–18.
7) Mini‑FAQ
- Can I conceive outside the window? It’s unlikely but timing can vary by a few days.
- Is this medical advice? No—use alongside professional guidance if trying to conceive.
8) Action tip
Combine this calendar with OPKs and cervical‑mucus checks for higher accuracy.