Its 13in in length. Im pissed. Shouldn't it been at least 15inch. opp's I thought 15 in means 15 inch, oops. I feel like a fool, but wont ask for any help. Glad I can return the 15.4 case to Target cause I DONT HAVE A COMP THAT IS THAT BIG AT ALLLLLLL. THAT WOULD BE FOR A 17 INCH. HAScreen sizes are always measured in diagonal length, inches. It's standard, and you shouldn't be surprised. Now if your MBP is 14 inches in diagonal screen length, then I'd be surprised!