What is the legal drink-driving limit in Finland?

In Finland, the legal blood alcohol limit for driving is 0.5 per mille (0.05% BAC). For professional drivers and those on a provisional license, a zero tolerance policy applies (0.2 per mille). Penalties are severe.

How long does it take for alcohol to leave the body?

The body metabolizes approximately 0.1–0.15 per mille of alcohol per hour. There is no way to speed up this process — coffee, cold showers, and exercise do not help. Only time eliminates alcohol from your system.

Is this calculator accurate enough for driving decisions?

No. BAC calculations are estimates and individual variation is significant. Factors like medication, health status, and food intake affect actual BAC. Never rely on a calculator to decide if it is safe to drive — the only safe choice is zero alcohol before driving.

Blood Alcohol Calculator

Estimate your blood alcohol level based on drinks consumed, body weight, and time elapsed. For informational purposes only — never drive after drinking.

Weight: 75 kg

40 kg150 kg

Calculation time (now)

⚡ Add drink quickly

🍹 Drinks consumed

17,8 g alcohol

BAC now (19:51)

0,40 ‰

Below limit

Now

🚗 Safe to drive (<0.5 ‰)

+2,3 h

✅ Fully sober (<0.1 ‰)

📉 BAC decrease — next 8 hours

+0h

+2h

+4h

+6h

+8h

Now+8h

≥1,5 ‰0,5–1,5 ‰<0,5 ‰

🚨 Do not drink and drive. Finnish law: DUI 0.5 ‰, aggravated DUI 1.2 ‰. Calculator is indicative — actual BAC varies individually. Always use a taxi or public transport. Emergency: 112.

This blood alcohol calculator estimates your blood alcohol concentration and roughly when you should be sober again, based on how much you drank and your personal details. It uses the Widmark formula, the most common way to make a rough estimate of intoxication.

How the calculator works and what it’s for▾

How blood alcohol is estimated

The Widmark formula relates the pure alcohol you consumed to the amount of fluid in your body, which depends on weight and sex. From this it derives the alcohol concentration in your blood, expressed in grams of alcohol per litre.

Over time the liver breaks alcohol down at a fairly steady pace, so the level falls gradually. The calculator uses this to estimate how long until you are sober.

What you need to enter

You typically provide the number of drinks or the amount of alcohol consumed, your weight, your sex, and how much time has passed since drinking. The more accurately you identify your drinks, the more reliable the estimate.

The result shows an estimated blood alcohol level and the time after which it has likely returned to zero.

An important caveat

The Widmark formula gives only a rough guide. Real intoxication is affected by food, metabolism, medication and individual differences that the calculator cannot account for.

Never use the result to decide whether you can drive. If you have been drinking, the safest choice is to leave the car at home.

🔄 Reviewed June 2026