A length of 400 meters is usually used to approximate 1/4 of a mile, especially in track races. Converting 400 meters to miles results in a value of exactly 0.2486 miles, according to Engineering Toolbox.
The length of 400 meters is also equivalent to 1,312 feet, 15,748 inches and 0.4 kilometers. According to Metric Conversions, each meter is equivalent to exactly 0.00062137 miles, and 1 mile is equivalent to 1609.3 meters. A race of 400 meters is common in track events. The current world record was set by Wayde van Niekerk with a time of 43.03 seconds.