Gezidao

Due Date Calculator

Estimate the due date and current pregnancy week from the LMP.

Estimates only — this tool does not replace medical advice.

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AHow to use

  1. 01 Enter the first day of your last menstrual period.
  2. 02 Adjust the cycle length if it differs from 28 days.
  3. 03 Read the estimated due date and the current pregnancy week.

QFAQ

How is the due date calculated? ＋

Naegele's rule: 280 days from the first day of the last menstrual period, adjusted by your cycle length difference from 28 days.

How accurate is it? ＋

It is an estimate — obstetricians confirm dating with an early ultrasound. Always follow your doctor's guidance.

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