Alcohol Burning Time Calculator

Estimate your blood alcohol concentration and time until sober. Predefined US and EU standard drink sizes for accurate results.

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⚠️ Disclaimer: This calculator provides estimates only. Alcohol metabolism varies significantly between individuals based on genetics, liver health, food intake, medications, and tolerance. Never use this tool to decide if you are safe to drive. When in doubt, don't drive.

How Alcohol Metabolism Works

Your liver metabolizes alcohol at a relatively constant rate of approximately 0.015% BAC per hour. This rate cannot be significantly changed by coffee, water, exercise, or cold showers — only time reduces your BAC.

US vs EU Standard Drinks

A US standard drink contains 14g of pure alcohol: a 12 oz (355ml) beer at 5%, a 5 oz (148ml) glass of wine at 12%, or a 1.5 oz (44ml) shot of spirits at 40%.

An EU standard drink (or unit) varies by country but typically contains 10-12g: a 330ml beer at 5%, a 125ml glass of wine at 12%, or a 25ml measure of spirits at 40%. UK units contain 8g of alcohol.

The Widmark Formula

BAC% = (Alcohol in grams) / (Weight in grams × r) × 100

Where r is approximately 0.68 for males and 0.55 for females.

Factors Affecting Metabolism

FAQ

What's the difference between US and EU drink sizes?
US standard drinks contain 14g alcohol (12 oz beer, 5 oz wine, 1.5 oz spirits). EU standard drinks contain 10-12g (330ml beer, 125ml wine, 25ml spirits). The calculator auto-sets the correct sizes when you switch regions.
How accurate is this calculator?
It uses the scientifically validated Widmark formula, but individual metabolism varies ±30% due to genetics, liver health, food intake, and tolerance.
Can I speed up alcohol elimination?
No. Coffee, cold showers, exercise, and water do not speed up liver metabolism. Only time reduces BAC.
Why do women get higher BAC than men?
Women typically have a lower percentage of body water (55% vs 68%), so the same amount of alcohol is less diluted.
Can I drive if the calculator says I'm under the limit?
Never rely solely on a calculator. Impairment begins well below legal limits.
How long does it take for one drink to leave your system?
On average, the body eliminates alcohol at a rate of about 0.015 BAC per hour, which is roughly equivalent to one standard US drink (14g of pure alcohol) per hour for an average-sized person. This means a single drink may take 1–2 hours to fully metabolize, depending on body weight, gender, and other factors.
Does coffee or a cold shower sober you up faster?
No. Caffeine and cold water may make you feel more alert, but they do not increase the rate at which your liver metabolizes alcohol. Only time reduces BAC. Drinking coffee while intoxicated can actually be dangerous because it may mask impairment and lead to riskier decisions like driving.
Why do women typically have higher BAC than men?
Women generally have a lower percentage of body water (about 52% vs. 61% for men) and less of the enzyme alcohol dehydrogenase in their stomachs. This means more alcohol enters the bloodstream directly. The Widmark factor reflects this difference: 0.73 for men and 0.66 for women.
Can I speed up alcohol metabolism?
No reliable method exists to accelerate liver metabolism of alcohol. The rate of approximately 0.015 BAC per hour is determined by liver enzyme capacity and is largely fixed. Eating food before drinking slows absorption but not elimination. Staying hydrated helps with hangover symptoms but does not reduce BAC faster.

How to Use the Alcohol Burning Time Calculator

  1. Enter your body weight — the calculator uses this to estimate blood volume and alcohol distribution.
  2. Select your gender — men and women metabolize alcohol at different rates due to differences in body water percentage.
  3. Add your drinks — choose from preset standard drink sizes (US or EU standards) or enter custom amounts including ABV and volume.
  4. Set the time you started drinking — the calculator factors in elapsed time since your first drink.
  5. Review your results — you'll see estimated BAC, time until sober (BAC reaches 0.00), and a timeline of elimination.

Understanding Alcohol Metabolism and BAC

Blood Alcohol Concentration (BAC) measures the amount of alcohol in your bloodstream, expressed as grams of alcohol per 100 milliliters of blood. The body metabolizes alcohol at a relatively constant rate through the liver enzyme alcohol dehydrogenase (ADH). On average, the liver eliminates about 0.015 BAC per hour — roughly one standard drink per hour. This rate is remarkably consistent and cannot be significantly accelerated by coffee, cold showers, exercise, or any other "sobering up" method.

This calculator uses the Widmark formula, the most widely used BAC estimation method: BAC = (A × 5.14 / (W × r)) − 0.015 × H, where A is the number of standard drinks, W is body weight in pounds, r is the Widmark factor (0.73 for men, 0.66 for women, reflecting differences in body water), and H is hours since drinking began. The factor 5.14 converts fluid ounces to BAC percentage. Women generally have higher BAC than men after the same number of drinks because they have a lower percentage of body water.

Many factors influence BAC beyond weight and gender: food in the stomach slows absorption (drinking on an empty stomach can double peak BAC), medications can inhibit ADH, liver health affects metabolism rate, and genetics play a role in enzyme efficiency. The legal driving limit is 0.08% in the US (0.05% in Utah) and 0.05% or lower in most of Europe. Even at BAC levels below legal limits, impairment begins at 0.02%, affecting judgment and reaction time. This calculator provides estimates only — always use a breathalyzer for actual BAC measurement.

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