Convertir JS en HTML

function calculator(){
        var x = Number(document.getElementById("x").value);
        var y = Number(document.getElementById("y").value);
     var z = Number(document.getElementById("z").value);
     var p = Number(30);
     var result;
  var calc = document.getElementById("choice").value
        switch(calc){
            case"1" : result = z * p; 
        break;
            case"2" : result = x * p + 50; 
        break;
            case"3" : result = x * p + 30; 
        break;

    }
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