Frequently Asked Questions

How does Promilaj calculate the estimate?

Promilaj works out how much pure alcohol is in each drink you log (volume × alcohol percentage) and combines that with your height, weight and biological sex. It also accounts for alcohol leaving your body over time to produce an estimate for the current moment.

The calculation is based on the Seidl (2000) formula, published in an international peer-reviewed journal. The model works from the ratio of water and fat in the body. It was developed in the German population; estimation accuracy may vary across different body types.

How reliable are the results?

The results are estimates and are never a measurement. Your real blood alcohol level varies considerably depending on whether you have eaten, how full your stomach is, your metabolic rate, medication, lack of sleep, age and genetic differences.

None of these can be measured by a phone app. The number Promilaj shows can therefore be either higher or lower than your actual level.

Can I use the app to decide whether to drive?

No. Promilaj is not a tool for deciding whether to drive and must never be used as one.

If you have been drinking, the only safe level is zero. Even if the app says you are below the limit, do not drive — take a taxi, use public transport, or ask someone who has not been drinking.

Why use this instead of a breathalyser?

Do not — one does not replace the other. A breathalyser measures; Promilaj estimates.

What Promilaj gives you is visibility over the evening: it helps you keep track of how much you have had, notice when to slow down, and remember to drink water. It is an awareness tool, not a measuring device.

Is the legal driving limit the same everywhere?

No. Limits vary significantly between countries; some apply zero tolerance, and many set separate, lower limits for new drivers and professional drivers.

It is your responsibility to check the current rules for the country you are in from an official source.

Does the app cost anything?

No. Promilaj is a free download from the App Store and Google Play.

Which languages are supported?

Twelve: Turkish, English, German, Spanish, French, Italian, Russian, Swedish, Czech, Azerbaijani, Greek and Arabic. Right-to-left layout is supported for Arabic.

What are guest profiles for?

They let you track the estimated level of the people around you separately. Around a table, that makes the conversation about who can drive home a lot easier.

Each profile is calculated with its own height, weight and sex.

What if my drink is not in the list?

Pick the closest drink type in the list and adjust the volume and alcohol percentage by hand. The calculation is based on those two values, so the result stays valid.

Does this website collect data about me?

Not unless you press "Accept all" in the cookie notice. Until you consent, no analytics (Google Analytics) or advertising (Google AdSense) script is loaded onto the page at all.

The only things stored regardless of consent are your language preference and your cookie choice, both kept in your browser. Neither is sent to a server.

Where does the information I enter in the app go?

The information you enter is used solely for the calculation. Without collecting any personal or identifiable data, the app’s statistical data may be shared with third parties.

The privacy policy on this website covers the website only; you can read the app privacy policy from the link on the download page.

Can I change my cookie choice later?

Yes. The "Cookie preferences" link at the bottom of every page reopens the notice. If you withdraw consent the page reloads, which removes any analytics or advertising scripts that had been loaded.