İf your heap is binary, the formula is like that, otherwise you can look at https://cs.stackexchange.com/questions/9914/finding-the-height-of-a-d-ary-heap.
height = ⌈log(base2)(n+1)⌉-1
height = ⌈log(base2)(200+1)⌉-1
height = ⌈7,..⌉-1
height = 8-1
height = 7