// multi-utility computation suite · offline · instant · precise
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health.pregnancy-due-date Calculator
Calculates estimated due date using Naegele's rule from last menstrual period date, and tracks gestational age in weeks and days. Naegele's rule adds 280 days (40 weeks) to the first day of the last period — accurate for cycles close to 28 days.
Inputs
Days Since Lmp
Reference formula or conversion factor shown for context.
Results
gestational age
Current pregnancy duration in weeks from the first day of the last menstrual period. 37–42 weeks is full term. Each earlier week increases neonatal care requirements.
days remaining
Sample size or count used in the calculation.
weeks remaining
The result expressed in weeks. Multiply by 7 to convert to days.
trimester
Reference formula or conversion factor shown for context.