Pregnancy
When Did Conception Occur?
Calculate the probable conception date from your due date or last menstrual period.
Calculation
Due date - 266 days = conception। Or LMP + 14 days (±3-5 days)। First trimester ultrasound: most accurate (±3-5 days)।
India
Sex determination is ILLEGAL (PCPNDT Act 1994)। Ultrasound for health monitoring only। Severe penalties for sex-selective practices।
⚡ CalcWolf Insight
First trimester ultrasound (6-9 weeks) is the most accurate method for determining gestational age, accurate to within 3-5 days. After the first trimester, accuracy drops to 1-2 weeks. If your ultrasound date and LMP date disagree by more than 7 days, the ultrasound date is used for the due date.
Frequently asked questions
कैसे calculate?▾
Due date - 266 days। Ultrasound most accurate।
Exact date?▾
±5-7 days estimate। Only IVF/ICSI gives exact date।
✓ Math logic verified against primary sources
→ See our verification process
