Online Breathalyser (BAC) Calculator
Fast, accurate and free online alkomat online tool running directly in your browser.
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Online Breathalyzer
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Other tools you may find usefulOnline breathalyzer - alcohol calculator with a graph and sobering time
"Can I drive now?", "How much alcohol do I have now?", "When will the alcohol drop to zero?" – these are questions that come back like a boomerang after a party, a wedding or an ordinary evening. This online breathalyzer is designed to stop you from guessing. You enter your profile, drinks and hours, and you get a simulation of permille over time: the "now" result, the predicted maximum, a chart and approximate moments of going below the thresholds.
free online without registration result immediately permille chart own drinks
Important right away: this tool is not an "oracle" and does not replace the measurement with a real breathalyzer. But if you want to understand how permille can rise and fall over time, and how much the result depends onwhen youdrank, how long it took you to drink and what the portions were - this is exactly the type of permille calculator that makes sense for everyday use.
What do you actually get as a result?
You get not just one number, but the whole picture. The tool shows the estimatedper mille now, the predictedper mille maximumand the time when this peak may occur. Additionally, you get a chart and a timeline, thanks to which you can see the trend - whether the result is increasing, stagnant, or already falling.
This is practical, because in real life the problem is not "do I have exactly 0.27‰", but "will it be worse or better in an hour" and "when can I sleep peacefully that my body is already on the safer side of the chart?"
Why does this online breathalyzer focus on time
Two people can drink exactly the same thing and still have a different blood alcohol level - because one drank quickly, the other slowly, one ate properly, the other "empty". Many simple permille calculators pretend that time does not exist. Here it is the other way around: time is the main axis of the simulation.
As a result, you get an answer that is more "real": not only how much alcohol you can have at a given moment, but also when you will approximately go below the selected thresholds and what the path to zero looks like in the following hours.
How to use an online breathalyzer for reliable results
This blood alcohol calculator works best when you feed it with data from reality, not from dreams. This is not the moment for "I'll type less because maybe it will come out better." If you want to use the tool wisely, approach it like a map: a map helps, but it must have real starting points.
- Set profile: gender, weight, age and body type (this affects the breakdown of alcohol in the body).
- Enter the time frame: when you started drinking and when you stopped (this changes the dynamics of uptake and decline).
- Add drinks: use presets or enter your own (ml, %, quantity) if you drank something non-standard.
- Click "Calculate" and look at the chart and timeline - this is where you can see whether the "worst" is yet to come.
In the tool you also havelive preview. This is a quick version of the simulation, ideal when you are just filling in the data and want to see whether the permille is increasing or decreasing "for now". You get the full result with a longer timeline only after the final calculation - and this is normal. The preview should be quick and the result should be complete.
Most common scenario: "Yesterday there was wine and a few beers, am I clean in the morning?" What matters here is not only the number now, but also the trend. If the result continues to rise, it means your body is still absorbing - even if you haven't drank for a while.
A long evening and various drinks are a classic. Entering real hours (start and end) can dramatically change the result. What's often surprising about weddings is that the "peak" can happen later than you think.
IPA 6.5% and "strong" 7-8% do not behave like standard 5% beer. Instead of pretending it's the same thing, add your own drink (ml and %). This is one of the easiest ways to make the permille simulation closer to the truth.
Drinks can be tricky because the portion of alcohol is "hidden" in a nice glass. If you are not sure about milliliters, make two variants: more careful (larger portion) and gentler (smaller). You will see forks, not just one fairy tale.
How to read permille: the result "now" is not everything
Many people look at one number and instinctively make a decision: "it's low, so it's cool." But the permilles don't always drop. Sometimes the permille increases even though you no longer drink - because the body still absorbs alcohol. That's why this online breathalyzer shows a graph, not just a static result.
Permille "now"
This is a snapshot of a moment. Useful when you want to assess the current state, but in itself it does not answer the question "when will things get better". If the graph is going up, it means it could be worse in 20-60 minutes, even if the number looks "innocent" now.
In practice, this is the most risky moment: you feel better because your emotions have subsided, but your alcohol concentration may still increase. Simulation over time helps you see this in black and white.
Maximum, thresholds and "time to zero"
Maximum tells you what the highest point can be. Thresholds (e.g. 0.5‰ and 0.2‰) are landmarks that people often want to check. “Time to Zero” can be the most important thing for those who just want to stop wondering if alcohol is still in their system.
Honestly: it will always be an approximation. But an approximation based on real hours and real portions is worth much more than guesswork.
What influences the result in the permille calculator
Instead of magic tricks, stick to specifics. In this online breathalyzer, the result is most sensitive to: weight, gender, drinking time and the actual amount of alcohol in portions. The meal and metabolic rate (burning setting) also matter, but usually less than people think - they change the shape of the graph more often (when the peak and how long the "tail") rather than making 0.6‰ suddenly 0.1‰.
If you want to do a quick "what makes the biggest difference" test, do a simple test: count once as it was, then change just one thing. For example, you postpone the end of drinking by an hour, or change 0.33 to 0.5, or enter a real 7.5% instead of "approximately 5%". Suddenly you see that portions and time are the kings of the result.
Standard portions and your own drinks - how not to cheat yourself
The most common mistake is "underestimating portions" without realizing it. People say "I drank two beers", but they do not add that it was two strong 0.5 and then another half a glass of wine, "because someone poured it". This alcohol calculator gives you two convenient ways: presets (quickly) and your own drink (more precisely).
| Option | Typical portion | Typical strength | Best use |
|---|---|---|---|
| Large beer | 500 ml | approx. 5% | Classic beer 0.5 - when you want to count quickly and without any fuss. |
| Small beer | 350 ml | approx. 5% | When it actually was 0.33-0.35 and you don't want to "add" alcohol that wasn't there. |
| Wine | 175 ml | approx. 12% | A glass of wine, not "half a bottle per eye" - a good basis for sensible calculations. |
| Champagne / sparkling | 120 ml | approx. 12% | When there was a glass of bubbles; portion usually smaller than wine. |
| Shot | 50 ml | approx. 40% | Vodka, whiskey or similar - a classic "bar portion". |
| Own drink | any | any | IPA 6.5%, strong 7.5%, drinks, liqueurs - everything that is not "standard". |
Custom Drink is the best feature if you want to count permille after something non-standard. You don't have to be a chemist - just enter milliliters, percentages and amounts honestly. If you don't know exactly, take a reasonable value and do the second option. In 2 minutes you will get an answer whether the spread is "half an hour" or "half a day".
Permille chart and time axis - how to read it so as not to make a movie
The simplest method of reading the chart: look at the direction and pace. As the line grows, the situation worsens. When the line drops, the body fights alcohol. When the line is flat, you are in the balance between what is still being absorbed and what is already being metabolized.
The timeline (every few minutes) is "specific" mode. If you have a question like "how much alcohol at 7:00?" or "what's going to happen at 9:30?", that's right there. However, the chart is great when you want to understand whether the peak is already behind you or is yet to come.
Why "I feel sober" doesn't always mean "I'm sober"
Well-being can be misleading. Adrenaline, emotions, fatigue and context make a person "feel" that everything is OK, even though the alcohol levels are still present. That's why the alcohol calculator and the chart are useful - they show the mileage regardless of how much you want to believe in the good version.
If the chart says "it's still growing", it's really worth taking a correction. If it says "it's falling, but slowly", then planning makes sense, but with a margin of safety.
“When will I get sober?” – how to ask this question correctly
A good question is: “When am I likely to be in a downtrend and when will I move down to safer values?” In practice, this is more useful than "when will I have a perfect 0.00", because life rarely requires mathematical perfection, and more often requires a reasonable decision and margin.
This online breathalyzer does just that: it gives you a map over time, rather than one number without context.
Sharing the result and saving it - who needs it
There are situations when you want to show the result to another person: your partner, a friend, someone from your team. Instead of sending screenshots or rewriting numbers, you can share the finished result with a link in read-only mode. It's convenient because everyone sees the same graph and the same times.
If you are doing several variations (different times, different portions, different types of drinks), sharing helps you compare scenarios without chaos. And export to PDF can be useful for purely "organizational" purposes: you save the result, come back to it later, you don't have to count again.
Start with steps - use an online breathalyzer
The most common myths about permille (and why the calculator exposes them)
Myth number one: "If I eat fatty foods, the permille will magically disappear." Food can slow down the absorption, but it does not remove alcohol from the body. Myth number two: "Coffee, a cold shower and a walk will do the trick." They can change your feelings, but they don't do wonders for your metabolism. These are the moments when a tool such as an online breathalyzer helps you come back to earth: the chart is not prone to distorting reality.
There is also a more insidious myth: "I only drank beer, so it's nothing." If it was a lot and for a long time, the result can last a long time. And if you had a stronger beer or several servings in a short period of time, the peak may be higher than you think. That's why your own drinks and real hours do the job.
Sobriety time after alcohol - table
The body burns on average0.1-0.15 per mille per hour— always at your own pace, regardless of coffee, sleep or a cold shower. Approximate time to complete sobriety (men ~80 kg; women and lighter people - significantly longer):
| Alcohol consumed | Peak concentration (approx.) | Time to 0.0‰ |
|---|---|---|
| 1 beer 0.5 l (5%) | 0.3‰ | 2–3 h |
| 2 beers 0.5 l | 0.6‰ | 5–6 h |
| 3 beers 0.5 l | 1.0‰ | 8–10 h |
| Bottle of wine 0.75 l (12%) | 1.2‰ | 10–12 h |
| 200 ml of vodka (40%) | 1.1‰ | 9–11 h |
| 0.5 l of vodka | 2.8‰ | 20–28 h |
Practical conclusion: after a heavy party ending at midnightin the morning, you are still under the influence of, and you can often get back behind the wheel only in the afternoon. The virtual breathalyzer will estimate your result more accurately (it takes into account weight, gender and drinking time), but it is still an estimate - only a certified breathalyzer with a mouthpiece can provide certainty.
Also check the calorie content of drinks:how many calories are in beer i how many calories are in wine.
FAQ - online breathalyzer, permille and sobering time
Does the online breathalyzer show the same as a real breathalyzer?
No. It's a simulation based on the model and data you enter. A real breathalyzer takes measurements and in practice may give a result depending on many factors (equipment, calibration, testing technique, time since the last sip). This permille calculator is great for understanding the trend and an approximate pattern over time, but it does not give a "guaranteed" measurement value.
Why can my blood alcohol levels increase even though I no longer drink?
Because alcohol is absorbed over time. If you have just finished drinking or had a meal that slowed down the absorption, your body may still be pumping alcohol into the bloodstream. That's why an online breathalyzer with a graph can be more honest than a simple number: it shows whether you are before or after the peak.
What is more important: weight or type of drinks?
Both elements are important, but in practice the greatest impact is the actual amount of pure alcohol (portions and strength) and the drinking time. Weight and gender influence how this amount translates into permille. If you underestimate the portions or enter the wrong strength, the result will be just as bad even if you set the profile perfectly.
How to enter craft beer, liqueur or drink that is not included in the presets?
Use the own drink option and enter: ml, percentage and quantity. This is the simplest way to get a sensible result. If you are not sure about milliliters, count two variants: "less" and "more". Then you will see the forks and make your decision more carefully.
Is the meal and burning rate setting “secure”?
These are model parameters to help simulate various scenarios, but are not a promise. A meal often slows absorption, and the rate of burning can vary between people and situations. If you don't know, leave the default values and if in doubt, check the more conservative option.
Can I decide that I can drive based on the result?
Don't use the calculator as a pass. It is an educational and simulation tool. If the matter concerns safety, law or liability, the only sure way is sobriety and reliable measurement. In the real world, it is better to add a margin, because the risk of error is asymmetric: a mistake "in the wrong direction" can be really serious.
Why is there a link to share the result and a read-only mode?
So that you can show someone the finished result without rewriting and without the risk that someone will change something in the data. The link allows you to see the same numbers, graph and times. This is convenient for comparing scenarios, consultations and simple communication: "see what it looks like over time."
Can I use the online breathalyzer to plan multiple options?
Yes – and this is one of the best uses. You can calculate the "ideal" version (less alcohol, longer in time) and the "cautious" version (larger portions, shorter time), and then compare the graphs and the moment of descent to lower values. This often gives a better picture than trying to "recreate" one perfect version of the evening.
If you want, treat this online breathalyzer like a quick compass: it's designed to help you not wander in the dark. Enter your data, see the graph, check your descent times and make your decision with a margin. This works better than counting in your head and realizing that "so many hours have already passed."
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Related tools:alcohol calculator - permille and sobriety timeandpermille calculator.