BAC Calculator

0.00%

Blood Alcohol Content

Status: Normal

Time Until Sober (0.00%)

0h 0m

Time Until Legal (0.08%)

0h 0m

🚨 Legal Status

📊 BAC Effects & Impairment Levels

Effects vary by individual. Even low BAC levels can impair driving ability.

BAC Range	Effects & Behavior	Impairment
0.00% - 0.02%	Normal behavior, no obvious effects	Minimal (detectable only with tests)
0.02% - 0.04%	Slight euphoria, relaxation, reduced shyness	Slight impairment of judgment
0.04% - 0.06%	Feeling of warmth, talkativeness, increased confidence	Reasoning, memory, attention affected
0.06% - 0.08%	Disinhibition, extroversion, decreased sensitivity to pain	Peripheral vision, depth perception impaired
0.08% - 0.10%	Boisterousness, reduced motor control	LEGALLY IMPAIRED TO DRIVE
0.10% - 0.13%	Slurred speech, poor coordination, reduced reaction time	Significant motor impairment
0.13% - 0.16%	Blurred vision, major loss of balance	Gross motor impairment, lack of control
0.16% - 0.20%	Nausea, vomiting, "sloppy drunk" appearance	Severe impairment, blackouts possible
0.20% - 0.25%	Mental confusion, need help walking, vomiting	Severe motor impairment, blackouts likely
0.25% - 0.40%	Stupor, loss of consciousness, alcohol poisoning risk	MEDICAL EMERGENCY - CALL 911
0.40%+	Coma, respiratory arrest	FATAL - IMMEDIATE EMERGENCY

⚖️ Legal BAC Limits in the United States

Standard Legal Limit In all 50 states, it is illegal to drive with a BAC of 0.08% or higher if you are 21 or older. This is the "per se" limit - you can be convicted of DUI/DWI based solely on BAC, regardless of actual impairment.

Zero Tolerance Laws (Under 21) For drivers under 21, most states have "zero tolerance" laws with much lower BAC limits, typically 0.00% to 0.02%. Any detectable alcohol can result in license suspension and other penalties.

Enhanced Penalties Many states impose enhanced penalties for BAC levels of 0.15% or higher, including longer license suspensions, higher fines, and mandatory jail time.

🧮 How BAC is Calculated (Widmark Formula)

Widmark Formula

BAC = (A × 5.14 / (W × r)) - (0.015 × H)

Where:
A = Total alcohol consumed in ounces
W = Body weight in pounds
r = Gender constant (0.73 for males, 0.66 for females)
H = Hours since first drink
5.14 = Conversion factor for alcohol to blood
0.015 = Average BAC elimination rate per hour (can vary 0.012-0.018)

Important Notes About BAC Calculation The Widmark formula provides an estimate only. Actual BAC can vary significantly based on: food consumption, metabolism rate, medications, health conditions, drinking speed, type of alcohol, carbonation, individual tolerance, genetics, liver function, and hydration level. Some people metabolize alcohol faster or slower than the average 0.015% per hour.

🏥 Health & Safety Information

What Affects BAC? • Body Weight: Heavier people generally have lower BAC
• Gender: Women typically have higher BAC than men at same weight/drinks
• Food: Eating before/during drinking slows alcohol absorption
• Drinking Speed: Faster drinking = higher peak BAC
• Carbonation: Carbonated drinks increase absorption rate
• Medications: Many drugs interact dangerously with alcohol

Myths About Sobering Up ❌ Coffee doesn't lower BAC
❌ Cold showers don't lower BAC
❌ Exercise doesn't lower BAC
❌ Drinking water doesn't lower BAC
✅ Only TIME lowers BAC (liver processes ~0.015% per hour)

When to Seek Medical Help (Call 911) • Person is unconscious or can't be awakened
• Breathing is slow (fewer than 8 breaths per minute) or irregular
• Skin is cold, clammy, pale, or bluish
• Vomiting while unconscious or semi-conscious
• Seizures, confusion, or severe disorientation

These are signs of alcohol poisoning - a medical emergency!