Alcohol Units Calculator

The Alcohol Units Calculator converts your drinks into standard alcohol units, estimates the calories consumed, and calculates roughly how long until your blood alcohol clears. A standard UK unit contains 10 mL (8 g) of pure ethanol. Tracking units helps you stay within recommended weekly limits — 14 units for both men and women per UK guidelines — and understand the hidden caloric cost of alcohol.

How to Use This Calculator

1. Add each drink — select the beverage type (beer, wine, spirit, etc.) and enter the volume and ABV (alcohol by volume percentage).
2. Enter your body weight for the clearance time estimate.
3. Click Calculate to see total units, estimated calories, and hours until sober.

What This Calculator Measures

This calculator measures alcohol units consumed, caloric intake from alcohol, and estimated clearance time.

• Alcohol unit: Volume (mL) × ABV% ÷ 1000 = units (using 10 mL ethanol per unit).
• Calories: 1 gram of ethanol = 7 kcal; mixer and sugar calories are often additional.
• Clearance rate: The liver processes roughly 1 unit per hour on average.
• Weekly limit: 14 units spread across 3 or more days (UK guidelines).

Formula or Logic

Units = (Volume in mL × ABV%) ÷ 1000. Calories from alcohol = Units × 8 g/unit × 7 kcal/g ≈ Units × 56 kcal. Estimated hours to clear = Units ÷ average liver processing rate (0.9–1 unit/hour). Individual clearance varies with weight, sex, liver health, and food intake.

Example Calculations

Example 1: Two pints of 4% beer (568 mL each): Units = (1136 × 4) ÷ 1000 = 4.5 units; ~252 kcal from alcohol alone.

Example 2: A 250 mL glass of 13% wine: Units = (250 × 13) ÷ 1000 = 3.25 units; ~182 kcal; clears in ~3.25 hours.

Understanding Your Results

Staying under 14 units per week and having several alcohol-free days reduces the risk of liver disease, cancer, and cardiovascular problems. Even moderate drinking adds significant hidden calories that can contribute to weight gain.

Common Mistakes to Avoid

• Assuming a "glass" of wine is a standard serving — home pours are often 250–300 mL, not 125 mL.
• Ignoring the ABV listed on the bottle — craft beers can reach 7–10%.
• Believing strong coffee or a cold shower accelerates sobriety — only time clears alcohol.
• Exceeding weekly limits in one or two sessions (binge drinking) even if the weekly total seems low.