Mathematical Basis & Formula Guide
This calculation model operates directly using continuous mathematical equations:
Standard 40-week (280-day) obstetric gestational timeline.
Calculations are computed locally on your device with high-precision 64-bit IEEE floating-point arithmetic. No financial or personal parameters are transmitted to any remote analytics or storage server.
Frequently Asked Questions
The second trimester begins at the start of week 13 and extends through week 27.