The legal BAC limit in Ohio is 0.08% for drivers 21 and older operating a regular vehicle. Commercial drivers hit the legal impairment line at 0.04% behind the wheel of a commercial motor vehicle, and drivers under 21 are impaired at just 0.02% under Ohio’s zero-tolerance rule. Ohio calls the offense Operating a Vehicle Impaired, or OVI, and it’s a “per se” law: reaching the number is enough for a conviction, with no separate proof of bad driving required.
Those three thresholds are measured by whole blood. Ohio law also spells out equivalent limits for blood serum, plasma, breath, and urine, but the 0.08% whole-blood figure is the one most drivers actually encounter.
The 0.17% High-Tier Line
Ohio draws a second line at 0.17% BAC, more than double the standard limit. Test results at or above that number fall under division (A)(1)(f) of Ohio Revised Code 4511.19, sometimes called a “Super OVI” or high-tier OVI. The offense name is the same, but the mandatory minimums are heavier at every level, and the court gains additional required orders like restricted plates and an ignition interlock. If you’re wondering whether your reading matters beyond simply being “over,” it does, and 0.17% is where the second jump happens.
What a First OVI Costs
A first OVI within ten years is a first-degree misdemeanor. Penalties turn on which tier your BAC falls into.
Standard BAC (0.08% to 0.169%)
A first-time conviction carries a mandatory three consecutive days in jail. The court can substitute those three days with a certified driver intervention program, which is a structured education and assessment course. Fines run from $565 to $1,075. Your license is suspended for one to three years, and you can apply for limited driving privileges 15 days after the suspension begins.
High BAC (0.17% and Above)
At the high tier, the court must impose at least three consecutive days in jail plus three consecutive days in a driver intervention program. Refuse the program, or the court finds you a poor candidate, and the mandatory jail time rises to at least six consecutive days. The fine range stays the same and the suspension is still one to three years, but the court is required to order restricted license plates and an ignition interlock device if you receive any driving privileges.
How Prior Offenses Change the Numbers
Ohio counts prior OVI convictions within the last ten years when setting penalties for a new one. The mandatory jail time, fines, and suspension length all climb sharply with each prior offense, and the high-BAC tier doubles the mandatory minimum jail sentence at every level.
Second Offense Within Ten Years
Still a first-degree misdemeanor. Ten consecutive days in jail for a standard-tier BAC, twenty consecutive days at 0.17% or above. Fines range from $715 to $1,625. License suspension stretches to one to seven years. The court must order your vehicle immobilized for 90 days and your plates impounded.
Third Offense Within Ten Years
Still classified as a misdemeanor, but mandatory jail jumps to 30 consecutive days for a standard-tier offense or 60 consecutive days for a high-BAC offense. Fines range from $1,040 to $2,750, and the license suspension runs two to twelve years. The court can order criminal forfeiture of your vehicle.
Fourth or Subsequent Offense
A fourth OVI within ten years is a fourth-degree felony, carrying 60 to 120 days in prison and fines of $1,540 to $10,500. The same felony classification applies if you accumulate six or more OVI convictions within twenty years. Any subsequent offense after a prior felony OVI is bumped up to a third-degree felony.
The Lookback Window
The general lookback is ten years. A conviction older than that won’t automatically raise your mandatory minimums for a new offense. Under a provision known as Liv’s Law, the window extends to twenty years for certain serious felony charges like aggravated vehicular homicide and for reaching the six-offense felony threshold.
Refusing the Breath or Blood Test
Driving on any Ohio road, public or private, counts as consent to chemical testing after an OVI arrest. That’s Ohio’s implied consent statute, and it covers breath, blood, urine, and oral fluid tests.
Refuse the test and you trigger an administrative license suspension that runs entirely separate from any criminal penalty. A first refusal costs you your license for one year. A second refusal within ten years produces a longer suspension, and a third pushes it higher still. The registrar of motor vehicles imposes these suspensions whether or not you’re ever convicted of OVI, and the refusal itself can be used as evidence against you at trial.
Failing the test triggers an administrative suspension too, though a shorter one: 90 days for a first offense, longer with priors. Either type of suspension can be appealed by filing within 30 days of your initial court appearance.
Costs After the Case Ends
The courtroom fine isn’t the end of the money. Ohio charges a $315 reinstatement fee to get your license back. You’ll also need an SR-22 filing, which is proof of financial responsibility your insurance company files on your behalf, and Ohio requires it for at least three years after an OVI conviction. Courts can extend that period for more serious offenses.
Carrying an SR-22 tells your insurer about the OVI, and premiums follow. The high-risk classification after an OVI typically lasts three to seven years, with significantly higher rates during that stretch. If your SR-22 lapses for any reason, the insurer notifies the BMV and your driving privileges are suspended again until you reinstate the filing.
An ignition interlock brings its own recurring costs: professional installation, a monthly monitoring fee, and periodic calibration. First-time offenders who want full driving privileges during a suspension can get them if every vehicle they operate has a certified interlock installed. For second and later offenses, an interlock is mandatory any time the court grants driving privileges.