Topic authority hub

Pregnancy

Pregnancy week calculations, trimester timelines, and gestational age references.

Open Pregnancy Calculator

Formula pages

Pregnancy Formula Explained

Complete Pregnancy formula reference with variables, units, and examples.

How-to guides

How to Calculate Weeks Pregnant

Step-by-step pregnancy week calculation from LMP.

Reference & charts

Pregnancy Week-by-Week Chart

Pregnancy week chart with trimester milestones.

Browse all Health & Fitness tools →