A human can run as fast as about 27.8 miles per hour (44.72 kilometers per hour), which is the top speed recorded by the fastest sprinter, Usain Bolt, during a 100-meter sprint in 2009. His average speed during that race was about 23.35 miles per hour (37.58 kilometers per hour), and this peak speed was achieved briefly around the 60 to 80 meter mark. This is considered the fastest a human has ever run under recorded conditions and reflects a combination of extraordinary athletic ability and biomechanics.
For most people, average running speeds are far lower, typically around 5 to 6 miles per hour for an average adult over longer distances, which is much slower than the sprinting speeds of elite athletes.
