It's impossible to directly convert "aft" to centimeters. "Aft" is a nautical term referring to the rear or stern of a ship or aircraft. It's a directional reference, not a unit of measurement.

To make a conversion, you'd need additional information like:

* The length of the ship or aircraft: You could express the aft position as a percentage or fraction of the total length, then convert that proportion to centimeters.

* A specific distance from the aft: For example, "10 meters aft of the rudder" could be converted to centimeters (10 meters = 1000 centimeters).

Please provide more context or details so I can help you with the conversion!