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A browser-based alcohol metabolism & driving timer tool. No data sent to server.

📘 How to Use

  1. Enter your body weight using the slider or input field.
  2. Input the drink's volume (ml) and alcohol percentage (%) or select a preset.
  3. Check the estimated total time for alcohol metabolism and the specific time it will be cleared.

Alcohol Metabolism & Driving Timer

kg
ml
%

Quick Presets

Pure Alcohol Amount

0.0 g
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Estimated Metabolism Time

0 hours 0 mins
timer

Estimated Driving-safe Time

--:--
directions_car Based on current time
warning

This calculator provides estimates based on a general metabolism rate (body weight × 0.1g per hour). Actual alcohol clearance times vary significantly based on individual physiology, health, age, and gender. This result is not legal proof of sobriety. If you feel any effects of alcohol, do not drive. Drunk driving is strictly prohibited by law.

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Article

Alcohol Clearance Calculator｜Estimate Your Sober Up Time & Safe Driving Clock

This tool provides an estimate of how long it takes for your body to process alcohol based on your weight and the amount you've consumed. It's designed for anyone who wants to make informed and responsible decisions after drinking.

💡 Tool Overview

  • Personalized Calculation: The estimate is tailored to your body weight, providing a more relevant result than generic charts.
  • Versatile Drink Input: Manually enter the volume (ml) and alcohol by volume (ABV %) of any drink, or use the quick presets for common beverages like beer, wine, and spirits.
  • Clear & Actionable Results: Instantly see the total pure alcohol consumed (in grams), the total time needed for your body to break it down, and the specific time on the clock when you can expect your system to be clear.
  • Safety First: The main result is a "Safe to Drive" clock, offering a clear visual aid for planning ahead and avoiding drink driving.
  • 100% Private: Your body weight and drinking data are never sent to a server. All calculations happen entirely in your browser.

🧐 Frequently Asked Questions

Q. Is this calculation 100% accurate?

A. No. This calculator provides a theoretical estimate based on a standard formula (Widmark's). Actual alcohol metabolism rates can vary significantly based on factors like gender, age, health, metabolism, food intake, and medication. Always treat this result as an estimate and add a significant buffer time for safety. Never drive if you feel even slightly impaired.

Q. What formula does this calculator use?

A. The tool calculates the total grams of pure alcohol consumed (Volume (ml) * (ABV/100) * 0.8). It then estimates the time needed to metabolize it using the formula: Time (hours) = Total Alcohol (g) / (Body Weight (kg) * 0.1). The 0.1 factor represents an average hourly alcohol elimination rate per kilogram of body weight.

📚 Understanding Alcohol Metabolism

Your body processes alcohol at a relatively constant rate, primarily through the liver. The common rule of thumb of "one standard drink per hour" is a very rough average and can be misleading. A person's body weight is a major factor, which is why this calculator uses it as a key input. A heavier individual generally has a higher metabolic rate and more body water to distribute the alcohol, allowing them to process it faster than a lighter person.

However, the calculation is a simplified model. It doesn't account for the fact that metabolism doesn't start instantly, or that eating a meal can slow the absorption of alcohol into the bloodstream. Therefore, the time shown by this tool should be considered the absolute minimum. For the sake of safety, it is always best to wait longer than the estimated time or, even better, to not drive at all after drinking.