How to Determine a Proper Height to Hang a Dining Chandelier

It doesn't matter the size of your table - you need to be concerned about the height of the fixture from the floor. In most cases, it should be 60 inches from the floor to the bottom of the fixture. 12 feet less 5 feet (60 inches) would give you a chain length of about 7 feet. As mentioned above, you can try a mock up with a piece of cardboard and a string to get the exact length you need. You don't want the fixture blocking the view of other people sitting around your table.

Just add another foot to the chain hanging from the ceiling so that your chandelier is 60 inches from the floor.

You can hang it higher if you prefer, especially if it is made of a solid material that you can't easily see through. Ensure that it will still cast enough light onto the table. You want to be able to easily see other people sitting at the table.