"Tomboy" debuted at number two on South Korea's
Gaon Digital Chart in the chart issue dated March 13–19, 2022, ascending to number one in the following week. On the
Billboard K-pop Hot 100, the song debuted at number 21 in the chart issue dated March 20–26, 2022, ascending to number one in the following week. The song debuted at number three on the
Billboard South Korea Songs in the chart issue dated May 7, 2022, ascending to number one in the chart issue dated June 4, 2022. In Singapore, the song debuted at number four on the
RIAS Top Streaming Chart in the chart issue dated March 18–24, 2022. The song also debuted at number 13 on the RIAS Top Regional Chart in the chart issue dated March 11–17, 2022, ascending to number one in the following week. On the
Billboard Vietnam Hot 100, "Tomboy" debuted at number 32 in the chart issue dated March 24, 2022, ascending to number 12 in the following week. In Hong Kong, the song debuted at number 22 on the
Billboard Hong Kong Songs in the chart issue dated March 26, 2022, ascending to number 11 the following week. In Taiwan, "Tomboy" debuted at number 15 on the
Billboard Taiwan Songs in the chart issue dated March 26, 2022, ascending to number five in the following week. In Malaysia, the song debuted at number 13 on the RIM International Singles Streaming Chart in the chart issue dated March 18–24, 2022. The song also debuted at number 11 on the
Billboard Malaysia Songs in the chart issue dated April 2, 2022, ascending to number nine in the following week. In United States, the song debuted at number 14 on the
Billboard World Digital Song Sales in the chart issue dated March 26, 2022, ascending to number 12 in the following week. Globally, the song debuted at number 58 on the
Billboard Global 200 in the chart issue dated April 2, 2022. ==Music video==