Ohio Revised Code Title XXIX. Crimes Procedure § 2967.191

(A) The department of rehabilitation and correction shall reduce the prison term of a prisoner, as described in division (B) of this section, by the total number of days that the prisoner was confined for any reason arising out of the offense for which the prisoner was convicted and sentenced, including confinement in lieu of bail while awaiting trial, confinement for examination to determine the prisoner's competence to stand trial or sanity, confinement while awaiting transportation to the place where the prisoner is to serve the prisoner's prison term, as determined by the sentencing court under division (B)(2)(g)(i) [FN1] of section 2929.19 of the Revised Code, and confinement in a juvenile facility. The department of rehabilitation and correction also shall reduce the stated prison term of a prisoner or, if the prisoner is serving a term for which there is parole eligibility, the minimum and maximum term or the parole eligibility date of the prisoner by the total number of days, if any, that the prisoner previously served in the custody of the department of rehabilitation and correction arising out of the offense for which the prisoner was convicted and sentenced.

(B) The reductions described in division (A) of this section shall be made to the following prison terms, as applicable: