var scrollbarOffset = 15;
var buffer = 5;
var gridHeight = ((rowCount > 0 ? rowCount : 1) * rowHeight) + footer + header + filter + buffer;
var scrollable= $.grep(element[0].attributes,
function (rn) {
                return rn.nodeName === "ui-grid-pinning";
              }).length > 0;

if (scrollable) {
    gridHeight = gridHeight + scrollbarOffset;
}