How many miles per hour can the fastest human run?
The fastest speeds achieved by humans are through sprinters that train to run as fast as they can during races.
Answer: The fastest anyone has run so far is about 27½ miles per hour.
This speed was reached (briefly) by the sprinter Usain Bolt just after the midpoint of his world-record 100-meter dash in 2009.
This speed was maintained briefly as it requires a lot of energy to run at that speed and is not sustainable. To run continuously for longer periods a lower speed is maintained, as seen in marathons.
Hence, the fastest human can run briefly at about 27½ miles per hour.