# Find the Maximum Depth OR Height of a Binary Tree

Objective: Given a binary tree, find the height of it

Input: A Binary Tree

Output: Height of a binary tree

Example:

Tree Height – Example

Approach:

Recursion:

• Get the height of left sub tree, say leftHeight
• Get the height of right sub tree, say rightHeight
• Take the Max(leftHeight, rightHeight) and add 1 for the root and return
• Call recursively.

Time Complexity : O(n)

get Height of a tree – Recursion

Complete Code:

Output:

```Height of the Tree is 7
```

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If you find anything incorrect or you feel that there is any better approach to solve the above problem, please write comment.
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• Anuj

Explanation with diagram is just amazing! Thanks!

• tutorialhorizon

Thanks Anuj

• Ardalan Yousefi

The height of a single-node tree is zero by definition, not one. You should check if your root has any children before adding 1 to the height.

• Rui Tang (Nathan)

public int treeHeight(Node root){
if(root==null)return -1;
return (1+ Math.max(treeHeight(root.left),treeHeight(root.right)));
}

This would work