Hello @life2
You cannot include superscript into input tags because the input tags do not render HTML code.
In this case, you can use the calculate field as an auxiliary but display the results into another field like an “HTML Content” field.
For example, assuming you have the equation: fieldname1*fieldname2
Insert an “HTML Content” field in the form with a div tag like <div class="result-here"></div>
where display the result.
Edit the equation as follows:
(function(){
var result = fieldname1*fieldname2;
jQuery('.result-here').html(result+'ft<sup>2</sup>');
return result;
})()
Finally, since the calculated field is used as an auxiliary, you can hide it by ticking a checkbox in its settings.
Best regards.