JSFiddle - React, Tailwind, and code Playground

HTML

<form id="calculator">
    <p>
        <input type="text" id="no1" placeholder="Broj 1" />
    </p>
    <p>
        <input type="text" id="no2" placeholder="Broj 2" />
    </p>
</form>
<div id="result"></div>

JavaScript

$(function() {
    $('input').on('input', function(){
         var no1 = $('#no1').val();
         var no2 = $('#no2').val();
         var c = 1; // konstanta koju ti odredjujes
         if(no1.length && no2.length){
            var res = no1 * c / no2;
            $('#result').html(res);
         }
    });
});