Educational estimate only. Do not use this tool to decide whether you are safe to drive, work, swim, or operate equipment.
What this intoxication calculator does
This intoxication calculator gives a rough estimate of blood alcohol concentration (BAC) using a standard Widmark-style formula. It combines body weight, biological sex estimate, amount of alcohol consumed, and time since drinking began to approximate current intoxication level.
It is meant for education and harm reduction—not legal, medical, or safety-critical decisions. Real BAC can differ substantially from estimates because human physiology varies from person to person.
How the estimate is calculated
1) Alcohol consumed
The calculator estimates pure alcohol volume from: number of drinks × drink volume × ABV. It also reports equivalent standard drinks (US standard drink ≈ 14 grams of pure alcohol).
2) Body distribution factor
Alcohol distributes differently based on body composition. A Widmark distribution factor (r) is applied:
- Male estimate: 0.73
- Female estimate: 0.66
- Midpoint estimate: 0.695
3) Metabolism over time
The model subtracts alcohol elimination over elapsed time. A common average value is about 0.015 BAC per hour, but real rates vary by individual and circumstance.
How to read your result
The output includes estimated BAC, a broad effect category, and an estimated time to return near zero BAC if no additional alcohol is consumed.
- 0.00–0.02: Minimal detectable effects in many people.
- 0.02–0.05: Mild impairment in attention, coordination, and judgment may begin.
- 0.05–0.08: Noticeable impairment; reaction time and decision quality decline.
- 0.08–0.15: Significant impairment; legal driving limit is exceeded in many regions.
- 0.15+: High risk zone for severe impairment and alcohol poisoning symptoms.
Important limitations
Even a good calculator cannot directly measure your BAC. Your true intoxication can be higher or lower due to:
- Food intake timing and composition
- Medication interactions
- Hydration and sleep deprivation
- Liver function and genetics
- Drinking speed and carbonation
- Measurement uncertainty in pour size and ABV
Harm-reduction best practices
- Set a drink limit before you start.
- Alternate alcohol with water.
- Eat before and during drinking.
- Avoid mixing alcohol with sedatives or opioids.
- Never drive after drinking—use a sober ride plan every time.
- Look out for friends, especially late in the night when effects can peak.
Frequently asked questions
Is this calculator legally valid?
No. Only certified testing methods are accepted for legal determinations.
Can coffee, cold showers, or exercise sober you up faster?
No. They may change how alert you feel, but they do not significantly speed alcohol metabolism. Time is the primary factor.
Why does one person feel more intoxicated than another at the same BAC?
Tolerance, health status, sleep, medications, and drinking context can change how intoxication is experienced even at similar BAC levels.
Bottom line: use this as a planning and awareness tool, not as permission to do risky activities.