This is a rough estimate based on typical assumptions (ovulation ≈ cycle length − luteal phase). It is not medical advice.
Tip: If your cycle varies a lot, consider tracking with multiple cycles and consult a healthcare professional for personalized advice.
Ovulation window calculator — Estimate ovulation date and fertile window from last period start (LMP) and cycle length. Includes clear disclaimer. Shareable, browser-only.
Example: Use this tool to sanity-check numbers quickly, then share the link if you need to discuss with others.
FAQ: (1) Does it upload my data? No—runs in your browser. (2) Can I share results? Yes—use the share link feature. (3) Is it authoritative? Treat it as a convenience, not professional advice.
排卵期／受孕窗推估工具 — 用末次月經開始日（LMP）與週期天數推估排卵日與受孕窗；附明確免責。可分享連結、純前端。
範例：用這個工具快速試算與對照結果，需要討論時再把連結分享給對方。
FAQ： (1) 會上傳資料嗎？不會，計算在瀏覽器內完成。 (2) 能分享結果嗎？可以，用分享連結。 (3) 準確嗎？請把它當作便利工具，不是專業建議。