About This Calculator

This Baby Due Date Calculator helps you estimate when your baby is due based on the first day of your last menstrual period (LMP) and your average cycle length.

How it works

The calculator uses Naegele's rule with adjustments for cycle length:

• Standard calculation adds 280 days (40 weeks) to your LMP.
• We adjust for your specific cycle length relative to the average 28-day cycle.

Note: This tool provides an estimate only. Please consult with your healthcare provider for a more accurate due date.

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