If the door is 7 tall frame the opening 7 1 5.
Sieting garage door.
There is no standard garage door size.
A problem with the spring tension could cause the door to open or close unevenly improperly or at the wrong speed and adjusting the springs will likely solve the problem.
If you are installing a 9 wide door the opening will be 9 3 wide.
However a single garage door at eight to nine feet wide and seven to eight feet high is a common measurement for many homes.
Frame the rough opening to 3 inches wider than the garage door size you have selected.