The Short Queen mattress size is 60 inches wide x 75 inches long. These are standard Short Queen bed measurements. Short Queen Mattress depths can vary from just a few inches to 8" or more. Many times, actual mattress dimensions will vary by one or two inches, usually smaller. The short queen mattress size is popular in rv, boat and sleeper sofa applications. Many times the short queen mattress can vary by an inch or two, usually shorter.