BAC Calculator for Denver, Colorado

Alex Harmon · Updated June 2026

DUI Law in Denver, Colorado

Denver is unique among major US cities in having a lower-tier impaired driving offense: DWAI (Driving While Ability Impaired) applies at BAC 0.05%–0.079%, even below the standard 0.08% DUI threshold. This means Denver drivers can be charged with an alcohol offense even with a BAC well under the national standard. Denver Police and Colorado State Patrol run extensive enforcement programs, particularly around the RiNo Arts District, LoDo, and Colfax Avenue entertainment corridors.

Denver's RTD light rail (including the W, E, and R lines), bus rapid transit, and expanding light rail network provide good coverage through the metro area. The system runs until midnight or later on most nights.

Colorado DUI first-offense penalties: fines of $200–$1,000, 5 days to one year in jail, 9 months license suspension, 48 hours to 96 hours of community service, and mandatory alcohol treatment. The lower DWAI threshold at 0.05% is a critical distinction for Denver drivers.

How Many Drinks to Reach the Limit in Denver?

The 0.08% BAC limit in Denver means different things for different people. The Widmark formula — the standard method for estimating BAC — depends on body weight, biological sex, number of drinks, and time elapsed. Here are rough estimates for reaching 0.08% BAC:

• 120 lb (54 kg) female: approximately 2–3 standard drinks in 2 hours
• 150 lb (68 kg) female: approximately 3–4 standard drinks in 2 hours
• 160 lb (73 kg) male: approximately 3–4 standard drinks in 2 hours
• 200 lb (91 kg) male: approximately 4–5 standard drinks in 2 hours

These are estimates only. Individual metabolism, food intake, and drink strength all affect actual BAC. The only reliable way to know your BAC is to use a calibrated breathalyzer or estimate with our BAC calculator.

Sobering Up After Drinking in Denver

Your liver eliminates alcohol at approximately 0.015% BAC per hour — regardless of coffee, food, water, or activity. If your BAC is 0.08% when you stop drinking, you will need approximately 5.3 hours before reaching zero. There is no shortcut.

Common myths: coffee does not speed up metabolism, cold water does not lower BAC, and "sleeping it off" only works if enough time passes. The only thing that sobers you up is time.

For a full breakdown of elimination rates and timing, see our How Long to Sober Up guide.

Colorado DUI Laws: What You Need to Know

For complete information on Colorado's DUI statutes, penalties, license suspension rules, and ignition interlock requirements, see our dedicated state page: