How is the due date calculated?

The due date is calculated using Naegele's Rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). If your cycle differs from 28 days, an adjustment is made.

What week of pregnancy am I in?

Pregnancy weeks are counted from the first day of your last menstrual period. Enter that date in our calculator to see your exact week, current trimester, and pregnancy progress.

How much should my baby weigh by pregnancy week?

Baby weight varies by gestational week. For example: week 12 (~14g), week 20 (~300g), week 28 (~1kg), week 36 (~2.6kg), week 40 (~3.5kg). Our calculator shows the estimated weight for your current week.

When does each pregnancy trimester start?

The first trimester spans weeks 1-12, the second weeks 13-26, and the third from week 27 until delivery (week 40). Each trimester has specific developmental milestones.

What size is my baby this week?

Doctors often compare baby size to fruits and vegetables. For example: week 8 is like a raspberry, week 14 like a lemon, week 20 like a banana, week 28 like an eggplant, and week 40 like a pumpkin.

When is the anatomy ultrasound?

The anatomy ultrasound is typically performed between weeks 18 and 22, with week 20 being most common. This ultrasound evaluates the baby's entire anatomy.

Is it normal for the due date to change?

Yes, the date may be adjusted after the first ultrasound. Only 5% of babies are born on their exact due date. Most are born between weeks 37 and 42, which is completely normal.

Calcufast

Calculadora de Embarazo Completa

Calcula tu fecha de parto, semana de embarazo actual y peso estimado del bebé. Todo en una sola calculadora.

Fecha de última menstruación (FUM)

Duración del ciclo (días)

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