Weddings: How Many Invitations to Order? - as part of the Wedding series by GeoBeats.

There is no real guidelines to the invitation count. The only real way of doing is sitting down and counting how many couples you have in your guest list and how many families you have in your guest list. Those only get one invitation and then you want to make sure you have extras just in case you have you have unexpected guest. You always want to be prepared.