BAC Calculator for Seattle, Washington

Q: What is the BAC limit in Seattle?

The legal BAC limit for drivers in Seattle, Washington is 0.08%. For drivers under 21, the limit is effectively 0.00–0.02% under zero-tolerance laws. For commercial (CDL) drivers, the federal limit of 0.04% applies.

Q: How many drinks is the legal limit in Seattle?

The number of drinks that puts you at the 0.08% limit varies significantly by body weight, sex, and how quickly you drink. As a rough guideline, a 160-pound male may reach 0.08% after 3–4 drinks in one hour. Women and lighter individuals reach the limit with fewer drinks. Use our free BAC calculator for a personalized estimate.

Q: What are DUI penalties in Washington?

A first-offense DUI in Washington typically carries fines, potential jail time, and license suspension. Penalties increase significantly for repeat offenses, high BAC readings (0.15%+), or if a minor was present in the vehicle. See our full Washington DUI laws page for detailed penalty information.

Alex Harmon · Updated June 2026

Key Facts for Seattle Drivers

Legal BAC Limit 0.08%

State Washington

Under-21 Limit 0.00–0.02%

CDL (Commercial) Limit 0.04%

Implied Consent Yes

Free BAC Calculator

Enter your weight, drinks, and time to get an instant BAC estimate. Know your number before you drive in Seattle.

Use the Free BAC Calculator →

DUI Law in Seattle, Washington

Seattle enforces DUI strictly, and Washington State's implied consent law adds automatic penalties for refusal. SPD and King County Sheriff run regular enforcement programs, and the city's rainy conditions and hilly terrain make impaired driving particularly dangerous. Major events at Safeco Field, CenturyLink Field, and Climate Pledge Arena increase enforcement presence.

Seattle's Link light rail, Sounder commuter rail, and extensive bus network — including King County Metro and Sound Transit — make it relatively easy to get home without driving. The system runs late on weekends.

Washington DUI first-offense penalties: minimum fine of $940.50, minimum 24 hours in jail or 15 days in electronic home monitoring, 90-day license suspension, and mandatory alcohol/drug assessment.

How Many Drinks to Reach the Limit in Seattle?

The 0.08% BAC limit in Seattle 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 Seattle

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.

Washington DUI Laws: What You Need to Know

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

Frequently Asked Questions

What is the BAC limit in Seattle?

The legal BAC limit in Seattle, Washington is 0.08% for drivers 21 and over. Drivers under 21 are subject to zero-tolerance laws (0.00–0.02% depending on state). Commercial CDL drivers are held to a stricter 0.04% federal limit.

How many drinks is the legal limit in Seattle?

The number of drinks to reach 0.08% varies by body weight and sex. As a rough guide, a 160-pound male may reach 0.08% after 3–4 drinks in one hour. Women and lighter-weight individuals reach the limit with fewer drinks. Use our BAC calculator for a personalized estimate based on your specific weight and drinking pace.

What are DUI penalties in Washington?

A first-offense DUI in Washington typically includes fines, potential jail time, and license suspension. Penalties are enhanced for high BAC readings (0.15%+), repeat offenses, or if a minor was in the vehicle. See our full Washington DUI laws page for complete penalty tables.

Facing a DUI Charge?

A DUI conviction costs $10,000–$25,000 on average. An experienced DUI attorney may challenge the stop, question the breathalyzer, or negotiate reduced charges.

FIND A DUI ATTORNEY →

Know Your BAC Before You Drive

Personal breathalyzers give you an accurate reading in seconds. The BACtrack Mobile connects to your phone and uses the same fuel cell technology as law enforcement devices.

CHECK PRICE ON AMAZON →

As an Amazon Associate we earn from qualifying purchases.