Radio Fórmula 103.3 FM is a prominent radio station based in Mexico City, Mexico. It serves as the flagship station of the Radio Fórmula network, one of the country's leading talk radio networks. The station's history dates back to 1957 when it first went on air as XERPM-FM.

In 1978, the station was acquired by Grupo Radio Fórmula and underwent several format changes over the years. It transitioned from music programming to its current news and talk format in the late 1990s, adopting the XERFR-FM call sign.

Today, XERFR-FM 103.3 broadcasts Radio Fórmula's Primera Cadena (First Network) programming, featuring some of Mexico's top radio personalities and journalists. The station offers a mix of news, analysis, opinion, and lifestyle content.

Key programs include "En los Tiempos de la Radio" with Oscar Mario Beteta, "Todo para la Mujer" with Maxine Woodside, and news broadcasts with renowned journalists like Joaquín López-Dóriga and José Cárdenas.

The station utilizes HD Radio technology and broadcasts from atop the iconic Torre Latinoamericana in Mexico City, ensuring wide coverage across the metropolitan area.