The calculator calculates your current week of pregnancy based on the first day of your last period or the date of conception. Optionally, you can enter your individual cycle to get an even more accurate result.

Our calculator provides an approximate orientation, but is based on averages. For a medically accurate determination of your week of pregnancy, we recommend an ultrasound scan with your gynecologist.

The pregnancy is medically counted from the first day of the last period — not from the day of conception. This means that the first two weeks of “pregnancy” are still before actual fertilization.

No problem! The calculator automatically uses the standard 28-day cycle. If you know your actual cycle length, you can enter it to personalize the calculation.

The Birth date calculator Calculate the expected date of delivery based on your cycle. The pregnancy week calculator, on the other hand, shows you which week of pregnancy (SSW) you are currently in — including trimesters and important development steps. Ideal if you want to know how far you are and what's happening in your body right now.

Knowing your exact week of pregnancy helps you better plan examinations, understand your baby's development and receive targeted tips on nutrition, care and well-being during pregnancy.

The pregnancy is counted from the first day of your last period. This means that the first two weeks of pregnancy are mathematically before fertilization.

In addition to the SSW computer and the Birth date calculator You will also find a practical Baby name generator. With AI-supported suggestions, this helps you find the perfect first name for your child — individual, modern or classic.