Calculate distance (in miles) between 2 coordinates on the earth

distance-between-coordinates-calculator.php

<?php
# License AGPLv3 - www.mrfake.name
function calculateDistance($lat1, $lng1, $lat2, $lng2) {
    $earthRadius = 3956; // Earth's radius in miles. Depends on what your opinion of Earth's radius is. You'll find varying information online, this is up to you.
    $deltaLat = deg2rad($lat2 - $lat1);
    $deltaLng = deg2rad($lng2 - $lng1);
    $a = sin($deltaLat / 2) * sin($deltaLat / 2) +
         cos(deg2rad($lat1)) * cos(deg2rad($lat2)) *
         sin($deltaLng / 2) * sin($deltaLng / 2);
    $c = 2 * atan2(sqrt($a), sqrt(1 - $a));
    $distance = $earthRadius * $c;
    return $distance;
}

TESTING.txt

(Must be done on Desktop)

Find two coordinates on Google Maps.

Right click the first point, click the coordinates. Paste them into the code.

Right click on the second point, click the coordinates. Paste them into the code.

Right click the first point again, click Measure Distance. Then click the second point. Then run the code.