bu şekilde yapabilirsin js ile üstteki olmaz
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&v=3&libraries=geometry"></script>
var latLngA = 42.26,3600
var latLngB = 28.34,4800
google.maps.geometry.spherical.computeDistanceBetw een (latLngA, latLngB);