Mathematical Basis & Formula Guide
This calculation model operates directly using continuous mathematical equations:
Naegele's Rule: LMP date + 280 days, adjusted for menstrual cycle duration.
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
Naegele's rule calculates the expected delivery date by adding 280 days (40 weeks) to the first day of your last menstrual period.