11 is a number, not a measurement. You need to specify what you're measuring to know how many inches it is. For example:

* 11 feet: There are 12 inches in a foot, so 11 feet is 11 * 12 = 132 inches.

* 11 centimeters: There are approximately 0.3937 inches in a centimeter, so 11 centimeters is 11 * 0.3937 = 4.33 inches (approximately).

Please provide more context so I can help you convert 11 to inches!