Why alq.app is more than just a simple calculator

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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: [link:how-long-does-alcohol-stay-in-blood]

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: [link:bac-limits-in-countries]

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

How accurate is this virtual breathalyzer?

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: [link:accuracy-of-bac-calculator]

Does the BAC calculator work without internet?

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.

Do I need to install the app from the App Store / Google Play?

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.

Do you store my personal data?

No. We value your privacy. All settings and parameters are stored only locally in your browser. Nothing is sent to our servers.

Does the result replace a police breathalyzer test?

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: [link:virtual-vs-police-breathalyzer]

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.

Virtual Breathalyzer OnlineScientifically proven accuracy