Use the same like document.getElementById('comment').innerHTML = 'Underweight' You cannot use like document.getElementById('comment').value = 'Underweight'

If (BMI = 18.5 & BMI = 25 & BMI 30) document.getElementById('comment').innerHTML = 'Overweight' And i don't understand what you wish to accomplish by the statement document.getElementById('answer').value = output so unless you explain that, i have commented it.ĭocument.getElementById('output').innerHTML = Math.round(BMI * 100)/100 and document.getElementById('comment') results in an empty set(null), hence the error : Cannot set property value of null. Remote patient monitoring acceptance trends among older adults residing in a frontier state. The things wrong with what you have done, is that the var output is not assigned any value. document.getElementById('answer').value = output If (output = 18.5 & output = 25 & output 30)ĭocument.getElementById('comment').innerText = 'Overweight' Var BMI = Math.round(weight / Math.pow(height, 2) * 10000) ĭocument.getElementById('output').innerText = Math.round(BMI * 100) / 100 var BMI = weight /Math.pow(height, 2)*10000 Var weightunits = document.getElementById('weightunits').value Var weight = Number(document.getElementById('weight').value) Var heightunits = document.getElementById('heightunits').value Var height = Number(document.getElementById('height').value) Your body mass index: Note: Results of the BMI calculator are based on averages. The BMI calculator uses the following BMI formula: Weight (lb) / (Height (in))² x 703.

Though it does not actually measure the percentage of body fat, it is used to estimate a healthy body weight based on a persons height.

A child's BMI is expressed as a 'centile' to show how their BMI compares with children who took part in. healthy weight between the 2nd and 91st centiles. Use the BMI calculator below to determine your body mass index by inputting your height and weight. bmi calculator The body mass index (BMI), or Quetelet index, is a heuristic measure of body weight based on a persons weight and height. The BMI calculator works out if a child or young person is: underweight on the 2nd centile or below. If (output=18.5 & output=25 & output30)ĭocument.getElementById('comment').value = 'Overweight' ĭocument.getElementById('answer').value = output Knowing BMI can help adult men and women understand their overall health. Var weightunits=document.getElementById('weightunits').value Var weight=Number(document.getElementById('weight').value) It is based on the results of the most comprehensive study published so far on the BMI and its. The SBMI an index that has been developed four years ago especially for this calculator serves for this purpose. Var heightunits=document.getElementById('heightunits').value This calculator computes the body mass index and rates it appropriately for men, women, children, juveniles and seniors. Var height=Number(document.getElementById('height').value) Please can someone help me fix my calculator, I know there are problems with my if statements? Thanks. There should be a message shown underneath: your bmi is:, and then the message underneath is this means you are: according to the BMI calculated above. I am trying to create a basic HTML/JavaScript BMI calculator.

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