Due date and gestational age (from LMP)

Estimated due date by Naegele's rule and today's gestational age.

Previewv0.1.0 · Pending clinical review

Inputs

0 of 1

First day of last period

Cycle lengthOptional, default 28

days

When to use

Pearls and pitfalls

First-trimester ultrasound redates if it differs by more than 5 to 7 days (depending on gestational age), per ACOG.

Why use

Gives weeks and days today plus trimester.

EDD = LMP + 280 days (adjusted for cycle length − 28); gestational age = today − LMP