Pregnancy Due Date Calculator
From the first day of your last period, this free calculator finds your expected due date, tells you which week of pregnancy you are in, which trimester that is, and how many days are left — a quick reference to track your pregnancy.
Estimated Due Date
—
You Are
—
Trimester
—
Days Remaining
—
This is an estimate only — only about 5% of babies arrive exactly on the due date. Please confirm with your doctor or midwife.
How to use
- Enter the first day of your last menstrual period.
- Select your usual cycle length (28 days is average).
- Click Calculate to see your due date, week, trimester and days left.
Tips
- The date is an estimate — only a small share of babies arrive exactly on it.
- A cycle longer or shorter than 28 days shifts the due date; enter your usual length for a closer result.
- An early ultrasound gives the most accurate dating — confirm with your doctor.