Blood Alcohol Calculator

Calculate your blood alcohol concentration based on what you drink

Gender and Weight

Drinking Time Period

2

Select Drinks

🍺

Beer

(5%)
Large
0.5L
0
🍷

Wine

(12%)
Glass
0.15L
0
🥃

Strong Liquor

(40%)
Shot
0.04L
0
🍸

Cocktails

(15%)
Standard
0.2L
0

Blood Alcohol Content Over Time

Legal limit (0.08%)
Slow Metabolism (0.01%/h)
Average Metabolism (0.015%/h)
Time Status
Slow Metabolism
(0.01%/h)
Average Metabolism
(0.015%/h)
10:00PM Drinking period 0.0% ✓ 0.0% ✓
11:00PM Drinking period 0.0% ✓ 0.0% ✓
12:00AM Drinking period 0.0% ✓ 0.0% ✓
1:00AM After drinking 0.0% ✓ 0.0% ✓
2:00AM After drinking 0.0% ✓ 0.0% ✓
3:00AM After drinking 0.0% ✓ 0.0% ✓
4:00AM After drinking 0.0% ✓ 0.0% ✓
5:00AM After drinking 0.0% ✓ 0.0% ✓
6:00AM After drinking 0.0% ✓ 0.0% ✓

This calculator uses the Widmark formula, which is the most widely used method for estimating blood alcohol concentration:

BAC = (A / (r × W)) - (M × t)

Where:

  • BAC: Blood alcohol concentration
  • A: Total alcohol consumed in grams
  • W: Body weight in kilograms
  • r: Distribution ratio (0.68 for men and 0.55 for women)
  • M: Metabolism rate (varies by individual)
  • t: Time since drinking began in hours

Note: This calculator assumes that alcohol consumption is evenly distributed across the drinking period. In reality, drinking patterns vary and may affect BAC differently.

Blood Alcohol Content (BAC) is the percentage of alcohol in your bloodstream. The legal driving limit in many places is 0.02% to 0.08%.

  • 0.02-0.04%: Slight mood changes and coordination
  • 0.05-0.07%: Impaired judgment and coordination
  • 0.08-0.10%: Legal intoxication (in many places)
  • 0.11-0.15%: Significant impairment of motor skills
  • 0.16-0.30%: Severe impairment, possible unconsciousness
  • Above 0.30%: Life-threatening