Bagaimana cara mengubah string ke number format di autosum function

Saya menggunakan input number format utk text input autosum. Bagaimana mengubah hasil dari autosum kembali ke number format?
<script>
function startCalc(){
interval = setInterval("calc()",3);}
function calc(){


var number_string = document.autoSumForm.nilai1.value.replace('.', "").toString(),
    A  =((number_string.replace('.','') ));
var number_string = document.autoSumForm.nilai2.value.replace('.', "").toString(),
    B  =((number_string.replace('.','') ));
var number_string = document.autoSumForm.nilai3.value.replace('.', "").toString(),
    C  =((number_string.replace('.','') ));
var number_string = document.autoSumForm.nilai4.value.replace('.', "").toString(),
    D  =((number_string.replace('.','') ));
var number_string = document.autoSumForm.nilai5.value.replace('.', "").toString(),
    E  =((number_string.replace('.','') ));
var number_string = document.autoSumForm.nilai6.value.replace('.', "").toString(),
    F  =((number_string.replace('.','') ));


  rp = ((A * 1) + (B * 1) + (C * 1) + (D * 1) + (E * 1) + (F * 1));
 var number_string = rp;
     value  = number_string;
document.autoSumForm.total.value =value;
    
}
function stopCalc(){
clearInterval(interval);}
</script>