The unit used for calculating acceleration depends on the units used for distance and time. Here are some common units for acceleration:

* Meters per second squared (m/s²): This is the standard unit in the International System of Units (SI).

* Feet per second squared (ft/s²): This is commonly used in the United States.

* Kilometers per hour squared (km/h²): This is sometimes used for measuring acceleration of vehicles.

Remember: Acceleration is the rate of change of velocity over time. Since velocity is measured in units of distance per time, acceleration is measured in units of distance per time squared.