# What is the speed of a bullet?

The average velocity of the most common ammunition in the world, a .22 long rifle ammunition, is approximately 720 mph, 1,200 km/h or 320 m/s. However, the actual speed of a bullet depends on a number of factors, including its physical dimensions and the gun from which it is fired.

The speed of a bullet is traditionally measured by the rate of travel the moment is leaves the barrel of a given firearm. Longer barrels and slow-burning propellants lead to higher muzzle velocities. Once free of the gun, a bullet fired in the open instantly begins to lose velocity due to air resistance. Although slower out of the barrel, heavier ammunition better resists the air to retain its velocity over distance.

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