The maximum speed of a Nimitz-class aircraft carrier is classified information, and specific figures may not be publicly disclosed. However, the Nimitz-class carriers are known to have a top speed in excess of 30 knots (34.5 miles per hour or 55.6 kilometers per hour). These carriers are powered by two nuclear reactors that provide propulsion to the ship's four propeller shafts. The nuclear power system enables them to achieve high speeds and maintain operational endurance over extended periods without the need for refueling.