Ohio Revised Code Title XXIX. Crimes Procedure § 2949.08

(C)(1) If the person is sentenced to a jail for a felony or a misdemeanor, the jailer in charge of a jail shall reduce the sentence of a person delivered into the jailer's custody pursuant to division (A) of this section by the total number of days the person was confined for any reason arising out of the offense for which the person was convicted and sentenced, including confinement in lieu of bail while awaiting trial, confinement for examination to determine the person's competence to stand trial or to determine sanity, confinement while awaiting transportation to the place where the person is to serve the sentence, and confinement in a juvenile facility.

(2) If the person is sentenced to a community-based correctional facility for a felony, the total amount of time that a person shall be confined in a community-based correctional facility, in a jail, and for any reason arising out of the offense for which the person was convicted and sentenced prior to delivery to the jailer, administrator, or keeper shall not exceed the maximum prison term available for that offense. Any term in a jail shall be reduced first pursuant to division (C)(1) of this section by the total number of days the person was confined prior to delivery to the jailer, administrator, or keeper. Only after the term in a jail has been entirely reduced may the term in a community-based correctional facility be reduced pursuant to this division. This division does not affect the limitations placed on the duration of a term in a jail or a community-based correctional facility under divisions (A)(1), (2), and (3) of section 2929.16 of the Revised Code.