drunk calculator

What this drunk calculator does

This drunk calculator estimates BAC (Blood Alcohol Concentration) using a common formula called the Widmark equation. It combines body weight, biological sex, alcohol consumed, and elapsed time to estimate how much alcohol remains in your bloodstream. The goal is awareness and safer decision-making—not a pass/fail signal for driving.

Important safety warning

Do not use this as proof that you are “okay to drive.” Even a low BAC can impair reaction time, judgment, and attention. If you have consumed alcohol, choose a safer plan: rideshare, taxi, designated driver, or staying put.

• This estimate can be wrong for your individual body.
• Actual BAC can be higher than estimated.
• Only certified breath or blood testing can determine legal intoxication.

How the estimate is calculated

1) Alcohol intake is converted to standard drinks

In the U.S., one standard drink contains about 0.6 fluid ounces (14 grams) of pure alcohol. The calculator estimates pure alcohol from your drink size and ABV, then converts it to standard drinks.

2) Widmark distribution factor is applied

Alcohol is distributed through body water. The Widmark “r” factor approximates this:

• Male: r = 0.73
• Female: r = 0.66
• Other/Unspecified: r = 0.70 (neutral estimate)

3) Metabolism over time is subtracted

A common average elimination rate is 0.015 BAC per hour. The calculator subtracts this from estimated peak BAC. Metabolism is not linear for every person, but this is a widely used approximation.

How to interpret your BAC result

• 0.00–0.02: minimal measurable effects in many people.
• 0.03–0.05: reduced focus, subtle judgment changes.
• 0.06–0.07: coordination and reaction time decline.
• 0.08+: legally impaired in many regions.
• 0.15+: severe impairment; risk of injury increases sharply.

Individual effects vary a lot. Two people with the same BAC can show very different levels of impairment.

Why calculators can be inaccurate

BAC estimators are useful, but not exact. Many factors are not fully captured:

• Food in stomach and meal timing
• Hydration and sleep deprivation
• Medication interactions
• Hormonal and metabolic differences
• Genetics and liver function
• Speed of drinking and drink-strength errors

Practical harm-reduction tips

• Set a transportation plan before drinking.
• Alternate alcoholic drinks with water.
• Eat before and during drinking.
• Avoid drinking games and rapid consumption.
• Never mix alcohol with sedatives unless directed by a clinician.
• Stop and seek help if someone shows signs of alcohol poisoning.

Possible signs of alcohol poisoning

• Vomiting repeatedly
• Confusion or inability to stay awake
• Slow/irregular breathing
• Seizures
• Bluish or pale skin
• Unconsciousness

If these signs appear, call emergency services immediately.

Bottom line

A drunk calculator can improve awareness, but it should always be used conservatively. If there is any doubt, do not drive, do not operate machinery, and choose safety first.