Due Date Calculator

Calculate your estimated due date from your last period, conception date, or IVF transfer date.

Calculation method

First day of last period

Cycle length (days)

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Calculation methods

LMP method (Naegele's rule): First day of last period + 280 days (adjusted for cycle length). Conception method: Conception date + 266 days. IVF transfer: Transfer date + 261 days (day 5) or + 263 days (day 3). The due date is an estimate — only about 4% of babies arrive exactly on the EDD.

Due Date Calculator: LMP, Conception & IVF Methods Explained →

Calculate your due date from last period, conception date, or IVF transfer. Naegele's rule, gestational weeks, trimesters, and milestones explained.