DUI Laws in Korea 2026: Blood Alcohol Limits and Safe Driving Windows

After the 2019 Road Traffic Act revision (Yoon Chang-ho Law), Korea tightened its DUI thresholds significantly. Here is what you need to know about BAC limits, penalties, and how long you must wait before driving.

Korea's DUI Standards for 2026 — The Essentials

Korea's DUI laws were significantly tightened in June 2019 under the so-called "Yoon Chang-ho Law," an amendment to the Road Traffic Act. Many drivers are unaware just how strict these rules have become.

Category	Blood Alcohol Concentration	Penalty
DUI	0.03% or above	License suspension (0.03–0.08%), License revocation (0.08%+)
Criminal DUI	0.03% or above	Up to 5 years in prison or fines up to 20 million KRW
Aggravated DUI	0.08% or above	1–5 years in prison or fines of 5–20 million KRW
Refusal to test	—	1–5 years in prison or fines of 5–20 million KRW

License revocation now triggers at 0.08% (previously 0.1%), and the suspension threshold dropped from 0.05% to 0.03%. The bottom line: even a small amount of alcohol can now lead to criminal charges.

How Blood Alcohol Concentration Is Calculated

BAC is typically estimated using the Widmark Formula:

BAC (%) = [Alcohol consumed (g) ÷ (Body weight kg × Distribution factor)] × 100

Distribution factor: 0.68 for men, 0.55 for women (women have less body water relative to fat)
Alcohol metabolism rate: approximately 0.015% per hour (varies by individual)

Alcohol Content by Drink

Soju (360 ml, 16.9%): 47.7 g of alcohol
Beer (500 ml can, 4.5%): 17.7 g of alcohol
Wine (150 ml glass, 12%): 14.1 g of alcohol

Estimated BAC by Drink Type (70 kg Male)

Drink	Volume	Estimated BAC
Soju 1 shot (50 ml, 16.9%)	50 ml	~0.014%
Half a bottle of soju (180 ml)	180 ml	~0.050%
Full bottle of soju (360 ml)	360 ml	~0.100%
Beer 500 ml can	500 ml	~0.034%
Beer 500 ml × 2 cans	1,000 ml	~0.068%

Even half a bottle of soju can push BAC above the 0.03% legal limit. Just 2–3 shots can put you in dangerous territory.

How Long After Drinking Can You Drive? — Reality vs. Myth

The most dangerous assumption is "I slept it off, so I'm fine." Alcohol metabolizes slowly even during sleep — roughly 0.015% per hour.

Example: A 70 kg male drinks a full bottle of soju at 10 PM

BAC immediately after: ~0.10%
Time to reach 0.03%: (0.10 − 0.03) ÷ 0.015 ≈ 4.7 hours
Safe to drive only after approximately 2:46 AM the next morning

Two bottles of soju? BAC ~0.20%. You would need about 11.3 hours before falling below the legal limit.

Breathalyzer vs. Blood Test

Officers use breath analyzers on the scene, which convert readings to blood BAC using a 2,100:1 conversion ratio. Results can vary by ±10%, so if your reading is borderline, you can request a more precise blood test through a court-appointed laboratory examination.

Bottom Line

When it comes to drunk driving, your only safe options are a designated driver service or a sober driver. Even if you estimate your BAC using a calculator, individual variation is enormous — never rely on rough estimates alone. "I only had a little" is one of the most dangerous things a driver can tell themselves.