🌸健康
排卵日計算機
Calculate your fertile window, ovulation date, period dates, and cycle phases for up to 6 future cycles. All calculations run entirely in your browser — no data is sent to any server.
🔒All calculations happen entirely in your browser. No data is sent to any server or stored anywhere.
Typical: 21–35 days
Current Phase
Follicular Phase
Ovulation: in 7 daysFertile window starts: in 2 days
Cycle Predictions
cycles
Cycle 1
🔴 Period
Sun Jun 21, 2026
→ Thu Jun 25, 2026
→ Thu Jun 25, 2026
🌿 Fertile
Tue Jun 30, 2026
→ Mon Jul 6, 2026
→ Mon Jul 6, 2026
⭐ Ovulation
Sun Jul 5, 2026
🔄 Next Period
Sun Jul 19, 2026
Cycle 2
🔴 Period
Sun Jul 19, 2026
→ Thu Jul 23, 2026
→ Thu Jul 23, 2026
🌿 Fertile
Tue Jul 28, 2026
→ Mon Aug 3, 2026
→ Mon Aug 3, 2026
⭐ Ovulation
Sun Aug 2, 2026
🔄 Next Period
Sun Aug 16, 2026
Cycle 3
🔴 Period
Sun Aug 16, 2026
→ Thu Aug 20, 2026
→ Thu Aug 20, 2026
🌿 Fertile
Tue Aug 25, 2026
→ Mon Aug 31, 2026
→ Mon Aug 31, 2026
⭐ Ovulation
Sun Aug 30, 2026
🔄 Next Period
Sun Sep 13, 2026
How to read your results
The fertile window is the 5 days before ovulation plus ovulation day — when pregnancy is possible. These are estimates based on average cycle patterns. Actual ovulation can vary by several days due to stress, illness, or hormonal changes. Use ovulation test strips for precision.
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How it works
This 排卵日計算機 runs entirely in your browser — no data is sent to any server. Simply fill in the fields above and the result updates instantly. You can copy the output with the copy button provided.