The formula for average kinetic energy is one-half the mass times the square of the velocity. Using mathematical notation, the formula can be written as KE_avg = 1/2 x m x v^2, where KE_avg is the average kinetic energy, m is the mass, and v is the velocity.
The average kinetic energy for a gas can also be calculated by multiplying the temperature times the Boltzmann constant times 3/2. The formula for determining the average kinetic energy can be adjusted for different input values, including the number of moles, the number of molecules and the universal gas constant. The average kinetic energy is related to the speed at which the molecules of a substance move.