Find out if you have a 5 IN. or 6 IN. gutter first because that will determine what size of the gutter guard will fit your gutter. We sell a 5 IN. standard version that will fit gutters between 2 IN. and 5 IN., and we also sell a 6 IN. Super version that will fit 6 IN. and 7 IN. gutters. To get the size of your gutter, measure the top of the gutter, starting at the front top outer lip, straight back to the fascia, just under the roof line.