BAC-kalkylator – Blodalkoholkoncentration
Estimate your Blood Alcohol Concentration (BAC) based on drinks, weight, and time.
Så här använder du den här kalkylatorn
- Ange Number of Drinks
- Ange Weight (kg)
- Ange Gender
- Ange Hours Drinking
- Klicka på knappen Beräkna
- Läs av resultatet som visas under kalkylatorn
How Blood Alcohol Concentration (BAC) Works
Blood Alcohol Concentration (BAC) measures the percentage of alcohol in your bloodstream. A BAC of 0.08% — the legal driving limit in most US states and many countries — means 0.08 grams of alcohol per 100 mL of blood.
Alcohol is absorbed through the stomach and small intestine, peaks in the blood 30–90 minutes after drinking, and is eliminated at roughly 0.015% per hour — about one standard drink per hour.
Widmark Formula: How BAC is Estimated
The Widmark formula is the most common BAC estimation method: BAC = (alcohol grams / (weight × r)) × 100 − (elimination rate × hours). The "r" factor is 0.68 for men and 0.55 for women, reflecting differences in body water distribution. Women typically reach higher BAC levels than men of the same weight after identical alcohol consumption.
A 70 kg man who drinks 3 standard drinks (36g alcohol) in 2 hours would have approximately: (36 / (70000 × 0.68)) × 100 − (0.015 × 2) ≈ 0.046%.
BAC Effects by Level
0.02–0.05%: Mild relaxation, slight impairment of judgment
0.05–0.08%: Reduced coordination, slower reaction time
0.08–0.15%: Significant impairment — illegal to drive
0.15–0.30%: Severe disorientation, nausea, blackout risk
0.30%+: Medical emergency, risk of coma or death
This calculator estimates BAC only. Never use an estimated BAC to decide whether to drive.
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- The breathalyzer was invented by Robert Borkenstein in 1954; before that, blood or urine tests were the only way to measure alcohol intoxication.
- A BAC of 0.08% became the legal driving limit across all 50 US states by 2004 — before then, limits varied from 0.08% to 0.15% by state.
- The liver can metabolize approximately one standard drink per hour regardless of coffee, food, exercise, or cold showers — none of these speed up alcohol elimination.
BAC-nivåer och Effekter
Effekter av olika blodalkoholnivåer.
| BAC (g/dL) | Fas | Typiska Effekter |
|---|---|---|
| 0.01–0.05 | Subclinical | Normal behavior; slight warmth; relaxation |
| 0.06–0.10 | Impairment begins | Mild euphoria; lowered inhibitions; slower reaction time |
| 0.11–0.15 | Clear impairment | Impaired coordination; slurred speech; legal DUI in most countries |
| 0.16–0.20 | Serious impairment | Poor balance; nausea; serious motor impairment |
| 0.21–0.29 | Severe impairment | Significant coordination loss; blackout possible |
| 0.30–0.39 | Danger zone | Loss of consciousness; breathing depression; life-threatening |
| 0.40+ | Potentially fatal | Coma; respiratory failure; death possible |
Senast uppdaterad: March 2026
Frequently Asked Questions
How long until I am sober?
Your body eliminates alcohol at roughly 0.015% BAC per hour. Divide your BAC by 0.015 to estimate hours until sober. Coffee, cold showers, and food do not speed this up.
What counts as one standard drink?
In the US: 12 oz regular beer (5%), 5 oz wine (12%), or 1.5 oz spirits (40%). Each contains roughly 14g of pure alcohol.
Why do women reach higher BAC?
Women generally have a higher body fat percentage and lower body water ratio, plus lower levels of the enzyme alcohol dehydrogenase. Both factors mean alcohol is less diluted and metabolized more slowly.