The 440-yard dash, or quarter-mile race, is a sprint race in track and field competitions. In many countries, athletes compete in the 440 yard dash (402.336 m) – which corresponds to a quarter mile. Many athletic tracks are 440 yards per lap. In the 19th century it was thought of as a middle distance race. The 440 yard race distance used imperial measurements, which have been replaced by metric-distance races. The 400 metres is the successor to the 440 yard dash. An athlete who competes in the 400 m may still be referred to as 'quarter-miler'.