Divide the acceleration in meters per second squared by 1,000 to convert to kilometers per second. For example, if your acceleration is 5 m/s^2, divide 5 by 1,000 to get 0.005 km/s^2.
Multiply the acceleration in kilometers per second squared by 12,960,000 to convert to kilometers per hour squared. In this example, multiply 0.005 km/s^2 by 12,960,000 to get 64,800 km/h^2.
Verify your answer with an online acceleration converter (see Resources). Enter the acceleration in meters per second squared and click "Convert!" The equivalent acceleration in kilometers per hour squared will appear.