"H" sold over one million units in Japan and was certified Million by the Recording Industry Association of Japan (RIAJ) on 24 November 2002 for shipments of one million units. This became the best selling single of the year in Japan and surpassed Hikaru Utada's 2002 single "Traveling" which sold over 850,000 units throughout the year. "Traveling" and "H" were the only singles of the year to be certified for one million copies shipped by RIAJ. Overall, "H" was the only single to sell over one million units that year and became Hamasaki's first and only single to be the yearly number one. According to Oricon sales, "H" is Hamasaki's fifth-best-selling single in her musical career, behind "A", "Seasons", "M" and "Boys & Girls".