The giant sub at Jersey Mike's measures approximately 14 to 15 inches in length. This size is about double the length of their regular sub, which is around 7 inches, and significantly larger than the mini sub, which is about 5 inches long

. The exact length can vary slightly depending on factors such as the type of bread and toppings, and regional differences in bread suppliers across Jersey Mike's locations may cause some variation. Some sources mention the giant sub could be up to 15 inches, but 14 inches is the standard size indicated by Jersey Mike's customer relations

. In comparison to other sandwich chains, Jersey Mike's giant sub is larger than Subway's footlong (12 inches), Potbelly's BIGS (8 inches), and Firehouse Subs' largest sandwiches (12 inches). Only Jimmy John's offers a larger sandwich with its 16-inch J.J. Gargantuan

. Overall, the Jersey Mike's giant sub is a substantial sandwich that can often feed multiple people or provide several meals for one person due to its size and calorie content