The Mulligan Defense offers two free online DUI tools for anyone facing a DUI charge in California: a DUI Penalty Calculator that estimates statutory fines, jail time, license suspension, and DUI school requirements under California Vehicle Code §23152 and §23153, and a BAC Calculator that estimates blood alcohol concentration using the Widmark formula based on drinks consumed, body weight, sex, and elapsed time.
Both tools are free, require no login, and are designed to give people arrested for DUI in the Coachella Valley—and throughout California—a factual starting point before fear takes over and bad decisions follow.
You just got a DUI. Your heart's pounding. Your phone's blowing up with ads from lawyers promising miracles. Your cousin Googled "DUI penalties California" and now he's an expert.
Here's the problem: none of that noise is helping you think clearly. And clear thinking is the single most important thing you need right now—because the system you're about to enter runs on speed and fear. The faster you panic, the faster you plead, and the faster the Larson Justice Center stamps your file "resolved" and moves on to the next one.
We built these tools to slow that process down. Not to give you legal advice—no calculator can do that. But to give you a map of the terrain so you stop making decisions based on dread and start making them based on facts.
Use the DUI Penalty Calculator →
Plug in the basics—first offense or prior convictions within 10 years, injury or no injury, BAC level, chemical test refusal, whether you're on DUI probation, and whether the driver is under 21—and the calculator shows you the statutory penalty range under California law. That includes estimated fines and assessments, probation length, DUI school duration (3-month, 9-month, or 18-month programs), license suspension periods, ignition interlock device (IID) requirements, and potential jail or custody exposure.
The calculator covers both Vehicle Code §23152 (non-injury DUI) and Vehicle Code §23153 (DUI with injury), and factors in the enhanced penalties found in VC §§23536–23582 for repeat offenses.
Why this matters: Most people arrested for DUI have zero idea what they're actually facing. They either catastrophize ("I'm going to prison") or minimize ("it's just a ticket, right?"). Both reactions lead to terrible decisions. The Penalty Calculator gives you the statutory floor and ceiling so you can stop reacting to fear and start asking the right questions.
It's not a prediction. Courts, prosecutors, judges, and the specific facts of your case all push the outcome around within that range. But once you can see the range, you have leverage—because you know the difference between a real threat and a scare tactic.
This tool uses the Widmark formula—a well-established method for estimating blood alcohol concentration—based on the type and number of drinks you consumed (beer, wine, liquor, or strong beer at various serving sizes), your body weight in pounds, your biological sex, and the time elapsed since your first drink. You select your drinks, set the timeline, and the calculator returns an estimated BAC with a visual gauge showing where you fall relative to California's 0.08% legal limit.
Why this matters: The BAC number on the police report drives everything—your charges, your penalties, your license suspension length, your DUI school requirements, and whether the DA treats your case as routine or aggravated. But that number is a measurement taken at a specific time, under specific conditions, using equipment that must comply with California's Title 17 regulations governing forensic alcohol testing—and it has its own margin of error.
If the officer pulled you over at 9:15 PM but the breath test wasn't administered until 10:45 PM, your BAC at the time of driving may have been significantly different from what the machine recorded. If you had three beers over four hours with dinner and the report claims 0.14%, something doesn't add up—and that's exactly the kind of gap a good DUI defense attorney digs into.
The calculator can't account for every variable (metabolism, food intake, stress, medications), but it gives you a framework to question the evidence instead of accepting it as gospel.
They can give you a clear, factual picture of your statutory exposure and help you evaluate whether the State's BAC number makes sense based on what you actually drank.
They can't replace legal advice. Every DUI case turns on its own facts—the legality of the traffic stop, field sobriety test administration, chemical testing procedures and Title 17 compliance, officer conduct, and whether the prosecution can actually prove each element beyond a reasonable doubt. A calculator doesn't analyze any of that. An experienced DUI defense attorney does.
Think of it this way: the calculators give you clarity, and clarity is leverage. Five minutes with these tools takes you from "I have no idea what's happening to me" to "I understand my exposure, I have questions about the evidence, and I'm ready to have a real conversation with a lawyer."
The DUI Penalty Calculator is based on current California statutory minimums and maximums for Vehicle Code §23152 (non-injury DUI) and Vehicle Code §23153 (DUI with injury). Actual outcomes vary by county, judge, prosecutor, plea negotiations, and the specific facts of your case. The BAC Calculator uses the Widmark formula, which is a widely accepted estimation method but cannot account for individual metabolic differences, food consumption, medications, or other biological variables. Neither tool constitutes legal advice.
No. The BAC Calculator is an estimation tool for people who have already been arrested and want to understand how their drinking timeline relates to the BAC the State is claiming. It should never be used to decide whether you are safe or legal to drive. Impairment begins well below 0.08%, and individual tolerance varies widely.
The Widmark formula is a pharmacokinetic equation developed by Swedish scientist Erik Widmark that estimates blood alcohol concentration based on the amount of alcohol consumed, body weight, a sex-based distribution ratio (men and women metabolize alcohol differently), and the time elapsed since drinking. It is the foundational formula used in forensic toxicology and DUI defense to estimate BAC at a given point in time.
A first-time DUI conviction under Vehicle Code §23152 in California typically carries informal probation (usually 3 years), fines and penalty assessments (often totaling around $1,850), a 3-month DUI school program (longer with a high BAC), a DMV license suspension (4 months for a first offense, though restricted license options exist), and possible but often avoidable jail time in no-injury cases. Aggravating factors like a BAC of 0.15% or higher, a chemical test refusal, or being on existing probation increase penalties significantly. Use our DUI Penalty Calculator to see the specific range for your situation.
A BAC of 0.15% or higher is considered an aggravating factor that can increase DUI school requirements from 3 months to 9 months on a first offense, and may trigger enhanced sentencing recommendations from the prosecution. A BAC of 0.20% or higher often results in even longer program requirements and increased scrutiny from the court. High BAC can also affect DMV Administrative Per Se (APS) hearing outcomes and IID requirements.
Refusing a chemical test (breath or blood) after a lawful DUI arrest in California triggers an automatic 1-year license suspension from the DMV on a first offense—longer than the standard 4-month suspension for a test failure. Refusal is also used as an aggravating factor in court proceedings and can result in enhanced penalties. The refusal enhancement applies regardless of whether you are ultimately convicted of the DUI itself.
Yes. Both calculators are based on California state law, which applies regardless of where you live. If you were arrested for DUI anywhere in Riverside County—including at the Larson Justice Center in Indio—the same Vehicle Code sections and penalty ranges apply. You will need California-based legal representation, and you should act quickly on the 10-day DMV hearing deadline.
The calculator shows statutory ranges—not outcomes. Even a "low penalty" first-offense DUI carries a criminal conviction on your record, a license suspension, mandatory DUI school, years of probation, and potential insurance and employment consequences. A DUI defense attorney evaluates whether the stop was legal, whether the field sobriety tests were properly administered, whether chemical testing complied with California Title 17 regulations, and whether the prosecution can actually prove its case. Many cases that look straightforward on paper have defensible issues that only emerge under scrutiny.
Run the numbers. Write down your questions. Then call The Mulligan Defense at (760) 777-4322 for a free consultation.
Attorney Joshua Mulligan is a California State Bar Board Certified Criminal Law Specialist—a credential held by fewer than 3% of criminal defense attorneys in the state. He graduated from Cornell Law School and Gerry Spence's Trial Lawyers College, and has been defending DUI cases at the Larson Justice Center in Indio since 2007. He's been named a Top Criminal Defense Lawyer by Palm Springs Life Magazine every year since 2014 and holds a perfect 10.0 rating on Avvo.
Josh will give it to you straight: what you're facing, what's worth fighting, and how to protect your license, your record, and your future. No fluff. No scare tactics. Just a Specialist who knows how to make the government prove its case.
Contact The Mulligan Defense today →
The Mulligan Defense is located in La Quinta, California and represents clients facing DUI and criminal charges throughout the Coachella Valley, including Indio, Palm Springs, Palm Desert, La Quinta, Cathedral City, Indian Wells, Rancho Mirage, Desert Hot Springs, Coachella, Banning, Joshua Tree, Yucca Valley, and Twentynine Palms, Thermal, Bermuda Dunes, and Blythe. All DUI cases in this region are heard at the Larson Justice Center in Indio.
