'Calculate Google Maps distance between two addresses
Public Function GetDistance(start As String, dest As String)
Dim firstVal As String, secondVal As String, lastVal As String
firstVal = "https://maps.googleapis.com/maps/api/distancematrix/json?units=metric&origins="
secondVal = "&destinations="
lastVal = "&mode=car&language=en&sensor=false&key=XXXXXX"
Set objHTTP = CreateObject("MSXML2.ServerXMLHTTP")
Url = firstVal & Replace(start, " ", "+") & secondVal & Replace(dest, " ", "+") & lastVal
objHTTP.Open "GET", Url, False
objHTTP.setRequestHeader "User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"
objHTTP.send ("")
If InStr(objHTTP.responseText, """distance"" : {") = 0 Then GoTo ErrorHandl
Set regex = CreateObject("VBScript.RegExp"): regex.Pattern = """value"".*?([0-9]+)": regex.Global = False
Set matches = regex.Execute(objHTTP.responseText)
tmpVal = Replace(matches(0).SubMatches(0), ".", Application.International(xlListSeparator))
GetDistance = CDbl(tmpVal)
Exit Function
ErrorHandl:
GetDistance = -1
End Function

{
"destination_addresses" :
[
"Tallinn, Estonia"
],
"origin_addresses" :
[
"Paris, France"
],
"rows" :
[
{
"elements" :
[
{
"distance" :
{
"text" : "2,571 km",
"value" : 2570531
},
"duration" :
{
"text" : "1 day 3 hours",
"value" : 98338
},
"status" : "OK"
}
]
}
],
"status" : "OK"
}