Alcohol calculators, safety and practical knowledge

Use this BAC calculator to estimate your blood alcohol concentration from your drinks and their timing. Explore the estimated alcohol curve without an account. It is not a breathalyzer measurement.

Add your drinks and their timing to see estimated BAC over time and when the model may reach zero. This is a forecast, not confirmation that you are sober.

Calculate pure alcohol in US fluid ounces and US standard drinks from the serving size and alcohol percentage. No personal details needed.

Choose the beer size and strength, add when you drank it, and estimate your blood alcohol level using your own details.

Enter your wine serving size, strength and timing to estimate your blood alcohol level. Adjust each glass separately.

Compare two serving sizes and strengths side by side to see how much pure alcohol each contains.

Convert between blood alcohol and breath alcohol in both directions. Choose a country to use the relevant legal BAC–BrAC relationship.

Calculate the approximate grams of pure alcohol in beer, wine or spirits, then compare standard-drink definitions used in six countries.

Add up pure alcohol across seven days, see the weekly pattern and, when confirmed data exists, compare it with guidance for the selected country.

Estimate energy from ethanol separately from the approximate energy in sugar, the drink itself, and mixers.

Why sleep does not reset alcohol, how a hangover differs from alcohol still being in your blood, and how to plan a safer morning.

Learn how to use a breathalyzer in four steps: wait before testing, blow correctly, repeat the reading and check the displayed unit.

Compare an alcohol estimate with a breath measurement and see when tracking drinks in Cheers is useful.

Compare BAC limits across 198 countries and territories, including zero-tolerance rules and lower limits for novice, young and professional drivers.

Compare how countries report alcohol in blood and breath: % BAC, g/L, mg/100 mL, per mille and breathalyzer units.

What happens to the brain and body as blood alcohol rises? Understand approximate stages of intoxication and warning signs of alcohol poisoning.

How repeated drinking can affect the brain, liver, heart, cells and the risk of alcohol dependence — an accessible evidence-based guide.

Alcohol may make it easier to fall asleep while disrupting sleep quality and structure. Learn why awakenings and next-day fatigue happen.

Learn how alcohol can alter medicines, which groups need particular caution and when to ask a doctor or pharmacist for advice.

A hangover and a BAC estimate describe different things. Understand what the curve can explain about the morning after.

Symptoms after reducing or stopping regular drinking can be unpredictable, and severe withdrawal needs urgent medical assessment.

Pregnancy and breastfeeding require separate guidance. Check current advice for the selected country and discuss your situation with a doctor or midwife.

A practical, non-judgemental plan for drinking less: identify your pattern, set a goal, prepare for difficult situations and review progress.

How to recognise when drinking is becoming difficult to control, what alcohol use disorder means and where to find safe professional support.

Short-term relaxation can be followed by poorer sleep, tension, and low mood the next day. Both amount and repeated pattern matter.

Add drinks in seconds, follow the evening's estimate, set alerts, and return to a complete session history.