"Poker Face" is an uptempo electropop and dance-pop song, and follows the footsteps of the previous single "Just Dance". Whereas "Just Dance" was predominately electropop, "Poker Face" carries a dark sound with clear vocals on the chorus and a pop hook while combining the synths from "Just Dance" and the more dance-oriented beat of the next single "LoveGame". According to Kerri Mason of Billboard, the composition "carr[ies] the pleather-and-sequins vibe of the downtown New York scene out of the underground and onto the FM dial without losing its smut and sass."
According to the sheet music published in Musicnotes.com by Sony/ATV Music Publishing, the song is set in the time signature of common time, with a moderate tempo of 120 beats per minute. It is written in the key of G-sharp minor with Gaga's vocal range spanning from the note F♯3 to the note B4. It begins with a medium tempo followed by electronic chord arrangement and the "Mum-mum-mum-mah" hook. The chords follow in this order: G♯m–G♯m–E–F♯, and then for the chorus G♯m–E–B–F♯. This is followed by the sound of dance music, produced by a powerful beat from the instruments, and a stuttering hook following the chorus.
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