If you paste this script into your chrome developer console or firebug console while visiting the StudiDB of the CAU you get the weighted grade point average.

weighted grade point average

(function(){
var rows = document.querySelectorAll('tr');
var row, note, module, ects, sumects = 0, summe = 0, divisor = 0;
var base = ["Inf-Math-A", "Inf-Prog", "Inf-DigiSys", "Inf-DSys", "Inf-EinfPP", "Inf-ADS", "Inf-OAR", "Inf-Math-B", "Inf-PP"];
for(var i = 0, len = rows.length; i < len; i++){
        row = rows[i];
        module = row.querySelectorAll('.f1:nth-of-type(2)');
        note = row.querySelectorAll('.f1:nth-of-type(3)');
        ects = row.querySelectorAll('.f1:nth-of-type(4)');
        if (note.length && ects.length){
                note = parseFloat(note[0].innerHTML);
                if (note < 5.0 && note > 0) {
                        module = module[0].innerHTML;
                        ects = parseFloat(ects[0].innerHTML);
                        sumects += ects;
                        for (var j = 0, len2 = base.length; j < len2; j++) {
                                if (module.indexOf(base[j]) !== -1) {
                                        ects *= 0.5;
                                }
                        }
                        summe += note * ects;
                        divisor += ects;
                }
        }
        note = ects = undefined;
}
 
console.log("Dein Schnitt: %.2f bei %d ECTS und %d Klausuren", summe/divisor, sumects, rows.length);
})();