SSW Calculator – Calculate Week of Pregnancy & Due Date

Sirawan Sindi

17 mai 2026

Schwangere Frau sitzt im hellen Babyzimmer und hält liebevoll ein Ultraschallbild vor ihren Babybauch

Gestation Week Calculator – Calculate Pregnancy Week & Due Date

Easily calculate your current gestational week, estimated due date, and important milestones of your pregnancy.

First day of your last period

Note: The calculation follows the usual 40-week method starting from the first day of the last period.

Your result 🧡

🍼 Current Gestational Week

📅 Estimated Due Date

🤰 Pregnancy Month

🛡️ Start of Maternity Protection

✨ Your Baby's Zodiac Sign

🧡 Matching BabyLions® Tip

How does the Gestational Week Calculator work?

The gestational week calculator determines your pregnancy week based on the first day of your last period. This method is commonly used to estimate the due date.

Important Milestones of Your Pregnancy

✔ calculate current gestational week
✔ find out estimated due date
✔ estimate pregnancy month
✔ calculate start of maternity protection
✔ discover suitable BabyLions® guides

Relevant Guides for Expectant Parents

Checklist for the Hospital Bag Baby Essentials: The Ultimate Checklist Packing the Diaper Bag: The Perfect Checklist Baby Development in the First Year How much sleep does my baby need?

Frequently Asked Questions about the Gestational Week Calculator

How accurate is a gestational week calculator?

The calculator provides a good orientation. However, the actual due date may vary, as every baby develops individually.

When does pregnancy count from?

Medically, pregnancy is calculated from the first day of the last period.

When does maternity protection begin?

In Germany, maternity protection typically begins 6 weeks before the calculated due date.

What does SSW mean?

SSW stands for "Schwangerschaftswoche", meaning gestational week. The information shows how far along your pregnancy is according to calculations.

Can the due date be changed later?

Yes, especially after ultrasound examinations, your doctor or midwife can adjust the estimated due date.

Important note: This calculator is for orientation only and does not replace medical advice. For questions about your pregnancy, please contact your doctor or midwife.