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BMI Calculator: Calculating Your Body Mass Index

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Guidelines for

You can calculate your body mass index (BMI) by using the following formula:

Weight (in kilograms)
------------------------
Height (in meters) squared

To convert your weight and height to metrics, note that 1 pound is equal to 0.45 kilogram and 1 inch is equal to 0.0254 meter. For example, a woman who weighs 120 pounds and is 64 inches tall also weighs 54 kilograms (120 X 0.45) and is 1.63 meters tall (64 X 0.0254). Her BMI would be 54 / (1.63 X 1.63), or about 20.3, which puts her in the normal range. Normal, overweight, and obese ranges for BMIs vary, but in general, a BMI of 20 to 25 is considered normal, 25 to 30 is considered overweight, and over 30 is considered obese. Using these ranges, up to 33 percent of the U.S. population should be considered obese. Obesity is more common in women than in men.

You can calculate your BMI by using the following form:

Add BMI calculator on your site!

Insert into <HEAD>
<SCRIPT LANGUAGE="JavaScript"> function mod(div,base) { return Math.round(div - (Math.floor(div/base)base)); } function calcBmi() { var w = document.bmi.weight.value 1; var HeightFeetInt = document.bmi.htf.value * 1; var HeightInchesInt = document.bmi.hti.value * 1; HeightFeetConvert = HeightFeetInt * 12; h = HeightFeetConvert + HeightInchesInt; displaybmi = (Math.round((w * 703) / (h * h))); var rvalue = true; if ( (w <= 35) || (w >= 500) || (h <= 48) || (h >= 120) ) { alert ("Invalid data. Please check and re-enter!"); rvalue = false; } if (rvalue) { if (HeightInchesInt > 11) { reminderinches = mod(HeightInchesInt,12); document.bmi.hti.value = reminderinches; document.bmi.htf.value = HeightFeetInt + ((HeightInchesInt - reminderinches)/12); document.bmi.answer.value = displaybmi; } if (displaybmi <19) document.bmi.comment.value = "Underweight"; if (displaybmi >=19 && displaybmi <=25) document.bmi.comment.value = "Desirable"; if (displaybmi >=26 && displaybmi <=29) document.bmi.comment.value = "prone to health risks"; if (displaybmi >=30 && displaybmi <=40) document.bmi.comment.value = "Obese"; if (displaybmi >40) document.bmi.comment.value = "Extremely obese"; document.bmi.answer.value = displaybmi; } return rvalue; } </script>

Insert into <BODY>
<form name=bmi> <center> <table width=200 border=0> <tr> <td align=center><B>Weight:</B> <input type=text name=weight SIZE=3 maxlength=3> lbs.</td> </tr> <tr> <td align=center><B>Height:</B> <input type=text name=htf size=1 maxlength=1> Ft. <input type=text name=hti size=2 maxlength=2> In. </td> </tr> <tr> <td align=center> <input type=button value="Calculate BMI" onclick="calcBmi()"> <hr></td> </tr> <tr> <td><B>Body Mass Index</B> <input type=text name=answer size=3> </td> </tr> <tr> <td> <a href="http://www.websmartideas.com/health/"> <img border="0" src="http://www.websmartideas.com/health/imagesh/bmi-idea.gif"></a><br> <input type=text name=comment size=25> </td> </tr> </table> </center> </form>

BMI Calculator: Calculating Your Body Mass Index

Guidelines for

Weight (in kilograms) ------------------------ Height (in meters) squared

You can calculate your BMI by using the following form:

Add BMI calculator on your site!

Weight (in kilograms)
------------------------
Height (in meters) squared