Hard liquor that is 60 proof equals how much actual ethyl alcohol?

60 percent alcohol = 120 proof. one percent = two proof.

Since this question involves 'proof' which is typically used to measure alcohol in distilled liquor, I need to point out some safety warnings.

At 120 proof, this is not something to drink 'straight'. That level and the even higher level of alcohol in 'Everclear' (190 proof) can actually 'burn' your skin by leaching water out of the skin cells. It is also flammable, some liquors of this level are used to 'flambe' food dishes.