The average human running speed can vary depending on factors such as age, fitness level, and training. On average, a person can run at a speed of around 8 to 10 miles per hour (12.8 to 16 km/h). However, trained athletes can achieve much faster speeds, with elite sprinters reaching speeds of over 25 miles per hour (40 km/h) during short sprints. It's important to note that individual capabilities can vary greatly, so the average running speed can differ from person to person.