The due date is typically calculated by adding 280 days (40 weeks) from the first day of your last menstrual period (LMP). This assumes a 28-day menstrual cycle and ovulation on day 14.

• Pregnancy weeks are calculated from the first day of your last menstrual period
• The due date is calculated as LMP + 280 days
• Actual delivery often occurs within 2 weeks before or after the due date

1. Select either last period date or conception date. 2. Enter the date. 3. View estimated due date, current week, and trimester. 4. Results show how many weeks and days into pregnancy.

1. Enter the first day of your last menstrual period accurately
2. Adjust if your average cycle is not 28 days
3. Check current week, due date, and trimester in the results

This calculator is for reference only. Consult with your healthcare provider for accurate information.

• The calculation results are estimates
• Ultrasound can provide more accurate week estimates
• Consult your healthcare provider immediately if you have any concerns