Mattress Sizes:
Twin Mattress Size (Single): 38" x 75"
Twin XL Mattress Size (Twin long): 38" x 80"
Most beds in college dorms have
twin long mattresses
Full Mattress Size (Double): 54" x 75"
Queen Mattress Size: 60" x 80"
King Mattress: 76" x 80"
California King Mattress Size: 72" x 84"