HomeCalcPro — 專案計算詳細報告
Tool: Conception Date Calculator — 免費線上計算機 | HomeCalcPro | 列印時間:
Conception Date Calculator — 免費線上計算機 | HomeCalcPro
Conception Date Calculator精準試算，提供行業標準公式與即時測算結果。
Parameters & Body Metrics
Health & Fitness Targets
Evidence-BasedEnter your parameters above to compute your target metrics.
Reverse Conception Formula
Transparent mathematical methodology explained in plain English.
Conception Date = Due Date - 266 Days (38 Gestational Weeks)Full-term human pregnancy averages 280 days from the Last Menstrual Period (LMP) or 266 days from the actual fertilization conception event.
Variables Explained:
- Estimated Due Date (EDD): Clinical 40-week delivery date provided by healthcare provider.
Due Date of July 15
Reverse calculating probable conception date.
- Subtract 266 Days from July 15: October 22 of prior year.
- Probable Intercourse Window: October 17 through October 23.
常見問題解答 (FAQ): Conception Date Calculator
Click any question below to expand quick answers, formulas, and expert tips.
Why is gestational age 2 weeks older than fetal age?
Medical gestational age is calculated from the first day of your last menstrual period (LMP), which occurs approximately 2 weeks before actual ovulation and conception occur.
How accurate is an early first-trimester ultrasound for dating?
A crown-rump length (CRL) ultrasound performed between 7 and 13 weeks of pregnancy is accurate to within ±3 to 5 days.