How to Use the Pregnancy Due Date & Trimester Calculator
- Select the first day of your last menstrual period (LMP).
- Adjust your average cycle length if different from 28 days.
- View your estimated delivery date (EDD), current gestational week, and trimester.
- Track important milestone dates (heartbeat, anatomy scan, full-term date).
Key Features & Capabilities
- Compliant with clinical Naegele’s Rule (280 days / 40 weeks).
- Live pregnancy progress meter and gestational age counter (weeks + days).
- Key milestone timeline from 1st trimester to early full-term (Week 37+).
Technical Architecture & Privacy
Pregnancy Due Date & Trimester Calculator is engineered with a focus on performance, mathematical accuracy, and maximum user privacy. Operating entirely in-browser on the client side, all processing takes place locally within your browser's JavaScript engine. None of your financial numbers, text entries, or private inputs are ever transmitted to or stored on remote servers.