Gauge: Rounds 1-3 = approx. 3 1/8″ x 4 7/8″

From the website:

Yes, technically it should be rectangular granny, but rectangle granny feels better. Either way, with this pattern you’ll be whipping up 7×9″ sections in no time for Warm Up America or your favorite charity that accepts this size. Or for yourself! I love grannies for the rhythmic comfort of mindless crochet. And plus, grannies always look good!