How Do I Measure My Table?
To get the correct measurement for your table measure the length of the table and the width of the table.
For the drop around the table, I normally recommend anywhere from a 7" - 10" around the table so you would need to double that to get the actual size of the table cloth you would need.
For example:
Length: 72" length of table plus 18" (9" for each side) = 90"
Width: 42" plus 18" (9" for each side) = 60"
60" X 90" table cloth would be the finished size for a 42" X 72" table that includes a 9" drop around all four sides of the table.