2. KNOWLEDGE, Development

Online calculator: Determine week of pregnancy & due date using ultrasound

With the help of this online calculator, you can use the measurements for HC, FL, BPD and CRL obtained during your ultrasound scan to determine your SSW (week of pregnancy/age of the fetus) and the expected date of birth (EGT).

Schwangerschaftsrechner – Gestationsalter & Geburtstermin

Operating instructions Online calculator

You can use this online calculator to calculate the progress of your pregnancy (week of pregnancy (wk)) and the expected date of birth based on the measurement data obtained during the ultrasound examination (sonography).

  • INPUT
    All fields highlighted in green are input fields.
  • Step 1
    Here you enter the date of your ultrasound examination (UU) using the drop-down menus.
  • Step 2
    Here you enter the measurement data from your ultrasound examination using the sliders.
    Rarely are all parameters determined during an examination – CRL, for example, is only measured in the first three months, HC and FL usually only after the third month.
    Use the checkboxes to select whether the parameter in question should be included in the calculation.
  • RESULTS
    All fields with a pink background indicate calculated values.
  • Pregnancy week (SSW): The calculated duration of your pregnancy based on the assumption that your fetus is developing normally.
  • Estimated due date (EGT): The date around which your baby is likely to be born.
    N.B.: In 66% of all cases, a baby is born within three weeks (= ± 10 d) of the calculated due date.