Virtual Breathalyzer OnlineScientifically proven accuracy
Our algorithm, based on Watson's formula, precisely estimates BAC levels, taking into account your individual characteristics. Check when you can drive safely – online and offline.Why alq.app is more than just a simple calculator
- Scientific precision, not guessing – Our algorithm, based on the scientific Watson formula, considers key factors: height, weight, age, gender, drinking time, and the effect of food. This gives you a reliable estimate, not just an approximation.
- Works without internet – Once added to your home screen, the app is always with you. Use it at the pub, in a taxi, or abroad – without worrying about signal.
- Full drink personalization – Define your own beverages, their strength (%) and volume (ml). Your favorite drinks are saved for future use.
- Clear answer to the key question – We show you the exact time when you can safely drive again, along with the time of complete sobriety.
- 100% Privacy – Your data never leaves your device. Everything is stored locally in your browser.
How does our virtual breathalyzer work? 4 simple steps
- Enter your details: height, weight, age, and gender.
- Specify the drinking duration (start and end).
- Indicate how much food you consumed while drinking (none / little / typical / a lot).
- Add the drinks you had – choose from the list or create your own beverages (% and ml).
That’s it! You’ll get a clear chart, estimated BAC level, time to “0.00‰”, and safe driving time in the selected country. Your settings are saved locally – everything will be ready for your next visit. Learn more: How Long Does Alcohol Stay in Your Blood? Complete Guide
BAC limits by country – your travel essential
Traveling abroad? Select a country from the list to instantly check the legal BAC limit for drivers. alq.app includes an up-to-date regulations table, helping you comply with local laws in Poland and worldwide. Data also works offline!
- Quick country lookup – see the allowed limit and penalty thresholds.
- Responsible planning – make informed decisions while traveling.
- Access without internet – key information always at hand.
Check the detailed list: BAC Limits by Country: Universal Guide (Ranges, Driver Categories, Checks)
Add alq.app to your phone screen in 5 seconds
On iPhone: open Alq.app in Safari, tap Share → Add to Home Screen. On Android: in Chrome, select Menu (three dots) → Install app. From then on, Alq.app runs faster and works offline.
FAQ – Frequently Asked Questions
Our algorithm provides precise results because it is based on scientific principles, including the Watson formula. It considers personal parameters (height, weight, age, gender), drinking time, and the effect of meals. More details: BAC Calculator Accuracy – How It Really Works and What to Expect
Yes. Once alq.app is added to your phone’s home screen (or after your first visit), the app works fully offline, just like a traditional mobile app.
No. alq.app is a modern web app (PWA), so you don’t need to download it from a store. Just add it to your home screen from your browser and it will work like any other app, including offline.
No. We value your privacy. All settings and parameters are stored only locally in your browser. Nothing is sent to our servers.
No. The result is informational and approximate. It is meant for responsible planning. The only reliable proof of sobriety is a test with a calibrated police breathalyzer. Comparison: Virtual vs Police Breathalyzer – Which Is Reliable?
Make informed decisions
alq.app is your support in responsible alcohol use. However, remember that metabolism is also affected by individual factors such as fatigue, stress, or medication.
Never drive if you are not 100% sure of your sobriety.
Calculate your BAC now
Start calculation – enter your details, drinks, and drinking time to see your estimated BAC and the time you’ll be safe to drive again.