<!-- Script by hscripts.com -->
<script type="text/javascript">
function calc()
{
var wt = document.bmi.wg.value;
var ht = document.bmi.ht.value;
var op=document.bmi.opt1.value;

//SI value
var h = ht/100;
var si = Math.round((wt/(h*h))*100)/100;
document.bmi.si.value = si;

//US value
var lb = wt*2.2;
var ic = ht*0.39;
var us = Math.round((703*(lb/(ic * ic)))*100)/100;
document.bmi.us.value = us;

//UK value
var uk = Math.round((6.35*si)*100)/100;
document.bmi.uk.value = uk;

//If value is not given for weight
if(wt=="")
{
alert("Introduzca el valor para el peso");
}

//If weight is less than 10
else if(wt<=10)
{
document.bmi.si.value = 0;
document.bmi.us.value = 0;
document.bmi.uk.value = 0;
alert("El peso debe ser superior a 10kgs");
}

//If weight is pounds and less than 22lbs
else if(op=="pounds"

<!-- Script by hscripts.com -->
<form name=bmi><br><b>BMI Calculadora</b>
<br>
Peso: <input type=text name=wg size=5>
<select name=opt1 onChange="unit()">
<option name=pounds value="pounds">pounds(lbls)</option>
<option name=kilograms value="kilograms" selected>kilograms(kgs)</option>
</select>
<br><br> Altura: <select name=opt2 onChange="conv(1)">
<option name=feet value="1">1'</option>
<option name=feet value="2">2'</option>
<option name=feet value="3">3'</option>
<option name=feet value="4">4'</option>
<option name=feet value="5">5'</option>
<option name=feet value="6">6'</option>
<option name=feet value="7">7'</option>
</select>
<select name=opt3 onChange="conv(2)">
<option name=inches value="0">0"</option>
<option name=inches value="1">1"</option>
<option name=inches value="2">2"</option>
<option name=inches value="3">3"</option>
<option name=inches value="4">4"</option>
<option name=inches value="5">5"</option>
<option name=inches value="6">6"</option>
<option name=inches value="7">7"</option>
<option name=inches value="8">8"</option>
<option name=inches value="9">9"</option>
<option name=inches value="10">10"</option>
<option name=inches value="11">11"</option>
</select>
or cms<input type=text name=ht size=5 onkeyup="conv(3)" class='innerc resform'>
<br><br><input type=button name=cc value="Calcular" onClick="calc()"><br><br>
<table cellspacing=0 cellpadding=3 border=0>
<tr align=center class="abouttabletext"><td>SI Unidades:</td><td> <input type=text readonly name=si></td></tr>
<tr align=center class="abouttabletext"><td>US Unidades:</td><td> <input type=text readonly name=us></td></tr>
<tr align=center class="abouttabletext"><td>UK Unidades:</td><td> <input type=text readonly name=uk></td></tr>
</table>
<table width=100%>
<tr><td colspan=2 align=center>
<input type="text" name=desc size=30 class=content readonly style="border:0px;">
</td>
</tr>
</table>
</form>
<div style="font-size: 10px;color: #dadada;" id="dumdiv"> <a href="https://www.hscripts.com" id="dum" style="text-decoration:none;color:#dadada;">©h</a></div> <!-- Script by hscripts.com -->