The average walking speed of a human can vary depending on several factors such as age, fitness level, terrain, and purpose of walking. However, as a general guideline, the average walking speed for an adult is typically considered to be around 3 to 4 miles per hour (4.8 to 6.4 kilometers per hour). This estimate assumes a comfortable walking pace on level ground with no obstacles or physical limitations.
It's worth noting that individual walking speeds can vary significantly. Some people may naturally walk at a slower pace, while others may walk faster. Additionally, factors like physical condition, health, and environmental conditions can influence an individual's walking speed.