There are approximately 2.6 inches in 6.6 centimeters.

Here's how to calculate that:

* 1 centimeter = 0.3937 inches

* 6.6 centimeters = 6.6 x 0.3937 inches

* 6.6 centimeters = 2.59862 inches

Rounded to the nearest tenth of an inch, this is 2.6 inches.