Should I use Simplified field Notation or Custom Calculation Script? I cannot get either to work. Adobe Acrobat XI Mac OS

Works perfectly now everyone!  Thanks!

Where is that found? I'll Google it if youre unsure off memory. Getting back to iMac in 15 minutes. Thanks so much.

1 last issue. It seems like my calculated field doesn't clear out if I clear out the values that led to it. Then if do it a 2nd type that value seems to be included in part of next set of inputs making the 2nd solution incorrect  

You do have an extra right parentheses in that script. In addition to what Bernd suggested in order to avoid a divide by zero error, you should convert each field value to a number. Otherwise, if any of the fields are blank, it will interfere with the summation of the field values. When you use the value field property to get the field value of a blank field, the result will be a zero length string. If you then add a zero length string to one or more numbers, the result will be a string that is a concatenation of the string representations of the numbers. As an example, if you have four fields that have values of: blank, "1", "2", and "3"

the result of adding their values will be the string "123", not the number 6. So do something like this:

// Get the value of the input fields, as numbers

var n1 = +getField("Text1").value;

var n2 = +getField("Text2").value;

var n3 = +getField("Text3").value;

// Calculate the sum

var sum = n1 + n2 + n3;

// Set this field value

event.value = sum;

The unary + operator used in the first part explicitly converts the field values to numbers, so a blank field value will be converted to zero.

Also, note that to set the value of the field to which the script is attached, the script needs to set event.value to the calculated value as the script above demonstrates. So your script could be revised to:

var m = +getField("CHESTTTTT").value;

var n = +getField("BICEPPPPP").value;

var o = +getField("TRICEPPPPP").value;

var p = +getField("SUBSCAPULARRRRR").value;

var q = +getField("MIDAXILLARYYYYY").value;

var r = +getField("SUPRAILLIACCCCC").value;

var s = +getField("ABDOMINALLLLL").value;

var t = +getField("THIGHHHHH").value;

var u = +getField("MEDIALCALFFFFF").value;

var w = +getField("BODYYYYY").value;

if (w !== 0) {

    event.value = (m + n + o + p + q + r + s + t + u) / w / 100;

} else {

    event.value = "";  // or set to 0 if that's what you want

}

Try this:

if (w.value != 0)

v.value=(m.value+n.value+o.value+p.value+q.value+r.value+s.value+t.value+u.value)*27/w.value/100;

else

v.value = 0;