The all-in-one drinking companion. Know your limit, track your BAC, and recover smarter.
Free forever · Coming to iOS & Android
"How many drinks can I have tonight?"
"I've had 3 drinks. Can I drive?"
"How do I recover before my 9am meeting?"
Local drink units and legal BAC limits for countries worldwide.
All data stays on your device. No accounts, no servers.
No subscriptions, no paywalls. Just a smarter way to drink.
Built on the Widmark formula, the gold standard in BAC estimation.
Three steps. One app. Total clarity.
Enter your weight, sex, and country. We save it locally — set it once and forget it.
Pick from local drink units — soju shots, beer pints, wine glasses. We know what you're drinking, wherever you are.
See your BAC, when you can drive, hangover risk, and a shareable result card — all in seconds.
Our BAC calculator uses the Widmark formula with your body weight, sex, and meal status to estimate exactly how much you can drink. Set a goal — driving, avoiding hangovers, or a custom BAC — and get a personalized drink limit.
Log each drink in real-time and watch your BAC curve rise and fall. Know exactly when you'll be sober, when it's safe to drive, and when the hangover window hits.
Check your symptoms — headache, nausea, dehydration, fatigue — and get evidence-based recovery tips. Hydration schedules, food recommendations, and curated product links to get you back on your feet.
Every feature designed to keep your night fun and your morning intact.
10-question quiz that grades your hangover from A to F with personalized recovery tips.
Compare BAC with friends in real-time. See who's leading the night.
Funny, smooth, and relatable excuses when you need to say no to another round.
6-item prep checklist: meals, water, taxi number, schedule, and medications.
Select your medications and get warnings about dangerous alcohol interactions.
Hydration timer with glass counter to pace your water intake between drinks.
Real-time guidance on when it's safe to have your next drink.
See total calories from drinks with fun comparisons — rice bowls, walking time, and more.
Countries supported
Drink types
Free forever
Data sent to servers
HowDrunk uses the Widmark formula — the gold standard used by forensic toxicologists worldwide. While individual metabolism varies, our estimates are as accurate as any consumer BAC tool. That said, never rely solely on numbers. If you feel even a little off, don't drive.
Yes, 100% free. No subscriptions, no paywalls, no hidden costs. We're supported by non-intrusive ads and affiliate links for hangover recovery products.
None. All your data — weight, drinking history, preferences — stays on your device. We don't have accounts, servers, or analytics that track individuals. Your drinking habits are your business.
We support 50+ countries with local drink units (soju shots for Korea, pints for the UK, standard drinks for Australia, etc.) and legal BAC driving limits. More countries are added regularly.
HowDrunk is coming to iOS and Android very soon — all features including real-time tracking, hangover recovery, group mode, and more are already built. Sign up above to get notified the moment it drops.
Get notified when HowDrunk launches and take control of your night.