وزنك بالنسبة لجسمك

<script language="Javascript">

function bmiCalc(form) {
        var weight = Number(form.wt.value);
    var height = Number(form.ht.value);

    if (!checkNum(weight,"WEIGHT")) {
        form.wt.select();
        form.wt.focus();
        return false
    }

    if (!checkNum(height,"HEIGHT")) {
        form.ht.select();
        form.ht.focus();
        return false
    }

        if (form.wu.selectedIndex == 0) {
                                        //  What units for weight?
                                        //  0 = lbs
                                        //  1 = kg
                weight = weight * 0.45359237;    //  Convert wt (lbs to kg)
        }

        if (form.sex[1].checked) {      //  Is the patient female?
                                        //  0 = male
                                        //  1 = female
        leanConvert = 148;
        idealConvert = 45.5;    //  conversion factors for women
        } else {
        leanConvert = 128;
        idealConvert = 50;    //  conversion factors for men
    }

    if (form.hu.selectedIndex == 0) { 
                //  if height units are "inches"
        heightInches = height;
        heightMeters = height * 2.54 / 100;
    }

    if (form.hu.selectedIndex == 1) { 
                //  if height units are "cm"
        heightInches = height / 2.54;
        heightMeters = height / 100;
    }

    if (form.hu.selectedIndex == 2) { 
                //  if height units are "meters"
        heightInches = height * 100 / 2.54;
        heightMeters = height;
    }


    var bsa = 0.20247 * Math.pow(heightMeters,0.725) *
        Math.pow(weight,0.425);
    var leanKg = 1.1 * weight - leanConvert * (Math.pow(weight,2) /
        Math.pow((100 * heightMeters),2));
    var leanLbs = leanKg * 2.2046226;
    var idealKg = idealConvert + 2.3 * (heightInches - 60);
    var idealLbs = idealKg * 2.2046226;
    var bmi = weight / Math.pow(heightMeters,2);

    bsa = rounding(bsa,2);
    leanKg = Math.round(leanKg);
    leanLbs = Math.round(leanLbs);
    idealKg = Math.round(idealKg);
    idealLbs = Math.round(idealLbs);
    bmi = rounding(bmi,1);
    if (bmi < 18.5) {
        var interp = " اقل من المعدل الطبيعي"
    } else {
        if (bmi < 25.0) {
            var interp = "مبروك بحدود المعدل الطبيعي"
        } else {
            if (bmi < 30.0) {
                var interp = "اعلى من المعدل الطبيعي"
            } else {
                var interp = "وزنك زائد يجب عليك الحرص في انقاصه"
            }
        }
    }

        form.bsa.value = bsa;
        form.leanKg.value = leanKg;
    form.leanLbs.value = leanLbs;
        form.idealKg.value = idealKg;
    form.idealLbs.value = idealLbs;
        form.bmi.value = bmi;
    form.interp.value = interp;

    return true
}


function checkNum(val,text) {
        if ((val == null) || (isNaN(val)) || (val == "") || (val < 0)) {
        alert("رجاء ادخال ارقام في حقلي الطول و الوزن");
                return false
        }
        return true;
}


function rounding(number,decimal) {
    multiplier = Math.pow(10,decimal);
    number = Math.round(number * multiplier) / multiplier;
        return number
}

// BY WWW.STRA28.COM
</script>