// ci = cc * 0.061023744095
var ci_calc = function() {
    var mm = Number(document.metric.Millimeters.value);
    var inches = mm * 0.061023744095;
    document.metric.Inches.value = Math.round(inches * 100) / 100;
    return inches;
};
// cc = ci * 16.387064
var cc_calc = function() {
    var inches = Number(document.sae.Inches.value);
    var mm = inches * 16.387064;
    document.sae.Millimeters.value = Math.round(mm * 100) / 100;
    return inches;
};