Due date calculator

Enter the first day of your last period. If your cycle isn't 28 days, we adjust for it.

Estimated due date

May 9, 2027

Calculated for a 28-day cycle.

Today you are 8 weeks and 0 days. · Trimester 1

Example

My period started on and my cycles usually last .

August 2026

MTWTFSS

Each day shows the moon of that night.

28days

2145

If you are not sure, leave it at 28 — the estimate already allows for that.

General information. Not a substitute for your doctor.

01 · The estimate

A due date is an estimate: fewer than 1 in 20 babies arrive on it.

How we calculate this

Naegele’s rule, adjusted when your cycle is not 28 days.

General information. Not a substitute for your doctor.