JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test"></div>

JavaScript

var element = $('<div/>');
element.css("margin-left", cmToPx(2));
$("#test").html(pxToCm(element.css("margin-left")));

function cmToPx(cm){
    return cm * 37.795276;
}

function pxToCm(px){
    return parseInt(px) * 0.02645833;
}