Alcohol calculator online

What is your blood alcohol level?

Estimate the level of alcohol in the blood and the approximate time it takes to break it down.

No registration and free.

0,00‰

Estimated blood alcohol level right now

Now

Add the first drink and you will see the estimate.

This estimate does not confirm sobriety or fitness to drive.

About you

For calculation

Gender (model)

Weight (kg)

Beginning of drinking

Stop drinking

This data remains only in this browser.

What did you drink?

Choose a drink

Drinks are evenly distributed between the start and end of drinking in the calculation. Absorption takes a model of 45 minutes.

Drinks consumed

0 drinks

Nothing here yet.

Development over time

Indicative model

Now+ 2 h+ 4 h+ 6 h+ 8 h

The curve is a mathematical approximation, not a measurement.

The estimate uses a simplified Widmark model, approximately 45-minute absorption and decay of a common level of 0.15‰ per hour. Individual absorption and metabolism may vary significantly. Do not use the result to decide whether you can drive. When in doubt, don't drive.

Alcohol in beverages

How long does alcohol take to break down?

Compare common servings and amounts of pure ethanol. This module illustrates the conversion at 8 g/h, not the individual sobering time.

2,5 hod.Large beer · 19.7 g ethanol

Illustrative conversion: grams of ethanol ÷ 8 g/h. It does not include absorption or body parameters and is not identical to the main calculator model. The result is not a predictor of sobriety or a basis for driving.

What does the degradation time depend on?

The amount of ethanol is also determined by individual metabolism and the course of absorption. A larger glass of wine can contain a similar amount of alcohol as a large beer.

Can alcohol stay in the blood for the next day?

Yes, the model can still show a non-zero level the next morning with a larger amount. The actual course cannot be confirmed by calculation.

How to find out the exact time of sobriety?

The amount of drinks alone is not enough to reliably determine the exact time. The Internet model does not replace measurement.

Source of illustrative value: NHS - Alcohol units. The NHS describes around 8g per hour for the average adult, with individual variations.

More about breaking down alcohol

Alcohol behind the wheel · world overview

Same alcohol. Other rules.

Compare basic blood alcohol limits and rules for selected groups of drivers in 47 countries and regions of the world.

Search for a country

Slovakia

0,0 g/l

Starting: 0.0 g/l
Professional: 0.0 g/l

Source

Czech Republic

0,0 g/l

Starting: 0.0 g/l
Professional: 0.0 g/l

Source

Hungary

0,0 g/l

Starting: 0.0 g/l
Professional: 0.0 g/l

Source

Romania

0,0 g/l

Starting: 0.0 g/l
Professional: 0.0 g/l

Source

Poland

0,2 g/l

Starting: 0.2 g/l
Professional: 0.2 g/l

Source

Sweden

0,2 g/l

Starting: 0.2 g/l
Professional: 0.2 g/l

Source

Norway

0,2 g/l

Starting: 0.2 g/l
Professional: 0.2 g/l

Source

Estonia

0,2 g/l

Starting: 0.2 g/l
Professional: 0.2 g/l

Source

Lithuania

0,4 g/l

Starting: 0.0 g/l
Professional: 0.0 g/l

Source

Austria

0,5 g/l

Starting: 0.1 g/l
Professional: 0.1 g/l

Source

Germany

0,5 g/l

Starting: 0.0 g/l
Professional: 0.0 g/l

Source

France

0,5 g/l

Starting: 0.2 g/l
Professional: 0.5 g/l

Bus drivers: 0.2 g/l.

Source

Italy

0,5 g/l

Starting: 0.0 g/l
Professional: 0.0 g/l

Source

Croatia

0,5 g/l

Starting: 0.0 g/l
Professional: 0.0 g/l

Source

Slovenia

0,5 g/l

Starting: 0.0 g/l
Professional: 0.0 g/l

Source

Spain

0,5 g/l

Starting: 0.3 g/l
Professional: 0.3 g/l

Persons under 18 years: 0.0 g/l; recheck the rules before the trip.

Source

Portugal

0,5 g/l

Starting: 0.2 g/l
Professional: 0.2 g/l

Source

The Netherlands

0,5 g/l

Starting: 0.2 g/l
Professional: 0.5 g/l

Source

Belgium

0,5 g/l

Starting: 0.5 g/l
Professional: 0.2 g/l

Source

Finland

0,5 g/l

Starting: 0.5 g/l
Professional: 0.5 g/l

Source

Ireland

0,5 g/l

Starting: 0.2 g/l
Professional: 0.2 g/l

Source

England and Wales

0,8 g/l

Starting: 0.8 g/l
Professional: 0.8 g/l

Source

Scotland

0,5 g/l

Starting: 0.5 g/l
Professional: 0.5 g/l

Source

Switzerland

0,5 g/l

Starting: 0.1 g/l
Professional: 0.1 g/l

Source

Bulgaria

0,5 g/l

Starting: 0.5 g/l
Professional: 0.5 g/l

Source

Cyprus

0,5 g/l

Starting: 0.2 g/l
Professional: 0.2 g/l

Source

Denmark

0,5 g/l

Starting: 0.2 g/l
Professional: 0.5 g/l

Source

Greece

0,5 g/l

Starting: 0.2 g/l
Professional: 0.2 g/l

Source

Latvia

0,5 g/l

Starting: 0.2 g/l
Professional: 0.5 g/l

Source

Luxembourg

0,5 g/l

Starting: 0.2 g/l
Professional: 0.2 g/l

Source

Malta

0,5 g/l

Starting: 0.2 g/l
Professional: 0.2 g/l

Source

USA

0,8 g/l

Baseline for adults; Utah 0.5 g/l. There are stricter rules for people under 21 and professional drivers.

Source

USA - Utah

0,5 g/l

Specific state limit; other categories of drivers have stricter rules.

Source

Canada

0,8 g/l

Criminal limit 80 mg/100 ml; it is not a uniform allowed tolerance. Provinces can apply sanctions already at lower values.

Source

Brazil

0,0 g/l

Zero tolerance according to Lei Sec.

Source

Argentina

0,0 g/l

The national law provides cero alcohol. Also check the rules of the relevant jurisdiction.

Source

Uruguay

0,0 g/l

Zero tolerance under law 19.360.

Source

Chile

0,3 g/l

DUI Category Limit; from 0.8 g/l the state of intoxication is distinguished.

Source

Australia

0,5 g/l

For a full driver's license. States and territories have stricter limits for beginners and some other categories.

Source

New Zealand

0,5 g/l

For drivers over 20 years old; zero applies for under 20 years.

Source

South Africa

0,5 g/l

Basic blood limit; special categories may have stricter rules.

Source

Singapore

0,8 g/l

80 mg of alcohol per 100 ml of blood. Even under the limit, driving under the influence can be penalized.

Source

Hong Kong

0,5 g/l

Separate legal regime; 50 mg/100 ml of blood.

Source

China

0,2 g/l

Drink driving limit 20 mg/100 ml; at 80 mg/100 ml, drunkenness is distinguished.

Source

South Korea

0,3 g/l

The legal limit for the ban on driving with a BAC of 0.03%.

Source

India

0,3 g/l

Limit 30 mg/100 ml according to the traffic police.

Source

Jordan

0,5 g/l

Amendment Act of 2025; 0.05 g per 100 ml for ordinary drivers.

Source

The data are expressed in grams per litre of blood (g/l). They are not automatically the same as blood alcohol concentration by mass (‰) and this directory does not compare the legal limit with your calculator result. The legal limit does not mean a safe level for driving. Other exclusions and stricter conditions may apply; before traveling, check the current rules of a specific country.

Is the same limit applicable throughout the European Union?

No. Rules vary by country and driver category. The overview covers a verified selection from several continents. It is not a complete database of all states or legal advice.

Source: ETSC – Blood Alcohol Content Limits across Europe. European data according to ETSC, others according to government and police sources and WHO, linked by each card. Sources checked 10/12/2026; it is not a legal audit of all local exemptions.

Detailed overview of limits in the world

Understand the result

An estimate that has its limits.

The calculator is an information tool. Neither the result nor the time to zero is a measure or confirmation of fitness to drive.

How does the alcohol calculator work?

Takes into account the amount and alcohol content of the drinks, the weight and the specified drinking range. It spreads the drinks evenly between the start and finish and calculates one total alcohol level.

You will get an estimate of the blood alcohol concentration (‰) and the approximate time to 0.00 ‰ according to the model. This calculation does not measure individual absorption or metabolism.

Calculation details

How long does alcohol take to break down?

Alcohol is metabolized mainly in the liver. Speed and course are individual; both genetic differences and nutrition can affect metabolism.

The calculator uses a fixed value of 0.15‰ per hour. It's an assumption of the tool, not the measured speed of your body.

Degradation of alcohol

What affects blood alcohol levels?

In this model, the amount of ethanol, mass, distribution coefficient and time are decisive. Body composition, absorption, and health or metabolic differences also affect the actual course.

What is residual alcohol

Alcohol in individual drinks

Compare the amount of pure ethanol, not just the size of the glass. The same volume of beer, wine and spirits contains different amounts of alcohol.

Beverage	Portion	Alcohol	Ethanol
Beer	500 ml	5 %	19,7 g
Wine	150 ml	12 %	14,2 g
Distillate	40 ml	40 %	12,6 g

Illustrative portions and concentrations. Check the exact contents on the label.

Calculate the grams of alcohol in your own drink

Frequently asked questions

Is the alcohol calculator accurate?

No. It provides a mathematical estimate based on the entered data and a simplified model. Actual level may vary.

What data do I need for the calculation?

Select gender for model, weight, start and end of drinking and add drinks with volume and number. Drinks are evenly distributed within the specified range.

How much blood alcohol concentration (‰) does one beer cause?

One universal value does not exist. It depends on volume, percentage of alcohol, body parameters, time and individual differences.

Can I drive according to the result of the calculator?

No. The calculator does not measure alcohol and does not confirm the ability to drive. Even a result of 0.00 ‰ is not proof of sobriety.

What is residual alcohol?

Alcohol that can remain in the body after drinking, even the next morning. Elapsed time or feeling of sobriety alone is not a measurement.

What does 0.00 ‰ mean in a calculator?

The model used estimates a zero level; the data is also rounded to two decimal places. It is not a confirmation that there is no alcohol in the body.

How does the multi-drink calculation work?

Amounts of ethanol are added to one common level. The model breaks down this level, not each drink separately.

Why does the result change over time?

The model uses the current time. The result and graph are recalculated every minute according to absorption and elimination assumptions.

Calculation methodology

Weight of ethanol: volume (ml) × alcohol (%) / 100 × 0.789. Model dose in blood alcohol concentration (‰): ethanol (g) / (weight (kg) × r).

The r coefficient is 0.68 for the male model and 0.55 for the female model. Each drink is divided into 60 time doses and each is absorbed for 45 minutes. Demolition of the common level is 0.15 ‰/h. The level does not drop below zero.

Concentrations in the catalog and cocktail recipes are indicative. The model does not take into account food, drugs, diseases or individual body composition. The green mark only means a model return to zero.

Model assumptions and limitations

Read on

Resources and transparency

The explanation of metabolism is based on NIAAA – Alcohol Metabolism. He explains the portions and different amounts of ethanol NIAAA – What Is a Standard Drink?. This is not an independent clinical validation of the calculator.

World alcohol limits Safe use · Data and Privacy · About the project