Smaller than you think even if you looked at the measurements. In hindsight I wouldn't buy this for a child over eight and most certainly it is not suitable for an adult. I recommend you test the mirror before bothering to spend the many hours it takes to put together. Whoever was on the assembly line for the mirror on the unit I purchased glued the touch sensor on backwards. So when I press the blue on/off button on the mirror, nothing happens. But if I pull the vanity out from the wall and touch the back of the black sensor box, the light will turn on and change from bright white to soft white etc. Pretty useless to have to pull it out from the wall every time my teen wants to turn it on or off. Highly disappointed. I feel like I wasted money and time. My teen thinks it looks nice but is also disappointed since it doesn't do what it is supposed to do, which is light up when you touch the on/off button.