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.

Wondering when you will be sober? Add your drinks and their timing to estimate alcohol elimination and the time until the model reaches zero. This is a forecast, not confirmation of sobriety.

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 grams of pure alcohol and compare standard-drink definitions used in the US, UK, Ireland, Canada, Australia and New Zealand.

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

Prepare for a breath test, avoid mouth alcohol, repeat the test correctly and understand the unit shown by your breathalyzer.

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

Check drink-driving limits across 198 countries and territories, including zero-tolerance rules and lower limits for novice 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.

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.