What Is the Cat Pregnancy Calculator?
The Cat Pregnancy Calculator estimates when your queen (female cat) is likely to give birth to her kittens. Feline gestation is relatively short and consistent, averaging about 65 days — roughly nine weeks. By entering the mating or breeding date, you instantly get an estimated due date plus a realistic delivery window so you can prepare a nesting box, schedule a vet check, and watch for signs of labour.
How to Use It
Select the date your cat was mated. The calculator defaults to a 65-day gestation, but you can adjust the average length between 58 and 72 days if your breed or vet's advice differs (for example, Siamese and Oriental breeds sometimes carry slightly longer). Press calculate to see the projected due date, how many days remain from today, and the earliest (61-day) and latest (69-day) expected delivery dates.
The Formula Explained
The core calculation is simple date arithmetic:
Because the exact moment of conception can vary by a day or two after mating, and litters can arrive early or late, the tool also reports a window of 61 to 69 days. Delivery before 61 days or after 70 days warrants a call to your veterinarian.
Worked Example
Suppose your cat was mated on 1 March 2024. Adding 65 days gives an estimated due date of 5 May 2024. The earliest realistic delivery (61 days) is 1 May 2024, and the latest (69 days) is 9 May 2024 — so you should be ready for kittens from early May onward.
使用注意事項與精準校對原則（6 大核心守則）
📐 1. 嚴格對齊輸入量綱與單位
輸入各項數值時請務必確認量綱（例如小時、天數、金額、百分比），避免單位不匹配引發推算偏差。
🔒 2. 純前端本機毫秒級隱私保障
所有計算邏輯 100% 在您的終端瀏覽器內完成，資料絕不上傳伺服器，嚴格守護商業與個人隱私。
📊 3. 符合公認學術與產業計算模型
演算法嚴格遵循國際通用數學公式與標準計算模型，經多重情境交叉核對，數值嚴密精確。
📋 4. 一鍵複製與免登入 PDF 匯出
支援一鍵複製推算結果字串至剪貼簿，亦可直接點擊列印按鈕輸出純淨 PDF 工作報表。
🔄 5. 多情景敏感度動態對比
建議針對極端值與多組預期情景分別試算，觀察輸出數據的波動區間，輔助做出更穩健的決策。
🛡️ 6. 專業諮詢與日常參考免責聲明
本工具運算結果供日常排程、學業研習與事前參考之用，如涉及重大法規或投資決策請諮詢持證專家。