Alcohol Recovery
How Long Does Alcohol Stay in Your System?
By Craig Bilton, Founder & Clinical Director · Updated 13 July 2026 · 9 min read
It is one of the most searched questions about drinking, and usually for a practical reason. You might be wondering whether you are clear to drive in the morning. You might have a test coming up. Or you might just be curious about why a heavy night still hangs over you the next day.
The honest answer is that alcohol leaves the body at a fairly steady, and fairly slow, rate. There is no trick to speed it up, and there is no reliable way to calculate exactly when you are clear. This article explains how long alcohol stays in your blood, breath, urine, and hair, what affects those times, and why the numbers come with an important warning.
We will keep this factual and straightforward. Towards the end there is a short, honest note for anyone who is asking this question because they are quietly worried about their drinking, because for some people, that is the real reason they are searching.
How Your Body Processes Alcohol
When you drink, alcohol is absorbed into your bloodstream, mostly through the stomach and small intestine, and carried around the body. Your liver then does the work of breaking it down, and it does this at a fairly constant pace.
On average, the body processes roughly one unit of alcohol per hour. A unit is a measure of pure alcohol, and most drinks contain more than one. A pint of regular-strength beer is around two units, a large glass of wine is around three, and a single measure of spirits is around one. So a few drinks can easily take many hours to clear.
The key point is that this rate is fairly fixed. You cannot make your liver work faster. Coffee, cold showers, fresh air, water, food, and sleep can all make you feel a little better, but none of them actually speed up how quickly alcohol leaves your system. Only time does that.
This is why someone can wake up feeling rough, assume they have slept it off, and still have significant alcohol in their system. The drinks from late the night before may simply not have cleared yet.
How Long Alcohol Stays in Different Parts of the Body
Alcohol can be detected for different lengths of time depending on what is being tested. The figures below are rough guides, not precise guarantees, because individual variation is significant.
In your blood
Alcohol is typically detectable in the blood for up to around 12 hours, depending on how much was drunk. Blood alcohol is the most direct measure of how much is currently in your system, which is why it is used in clinical and legal settings.
On your breath
Breath alcohol roughly tracks blood alcohol, which is why breathalysers are used by police. Alcohol can usually be detected on the breath for up to around 12 to 24 hours after heavy drinking. Mouthwashes and some other products can affect a breath reading in the very short term.
In your urine
Standard urine tests can detect alcohol for around 12 to 24 hours. However, more sensitive tests that look for a marker called EtG, a by-product of alcohol, can detect recent drinking for several days, sometimes up to three to five days after heavier use. This is why EtG tests are often used where complete abstinence needs to be confirmed.
In your saliva
Saliva tests can usually detect alcohol for around 12 to 24 hours after drinking. They are quick and non-invasive, which is why they are sometimes used for roadside or workplace screening.
In your hair
Hair testing is the long-range option. Alcohol markers can be detected in hair for up to around 90 days, and hair testing is often used to give a picture of longer-term drinking patterns rather than a single occasion. It does not show whether someone was over a limit at a particular moment, but it can indicate sustained heavy use.
What Affects How Long Alcohol Stays in Your System
The averages above shift considerably from person to person. The main factors include:
- How much you drank. More alcohol takes proportionally longer to clear.
- How quickly you drank it. Drinking quickly raises your blood alcohol higher, which takes longer to come down.
- Your body size and composition. Alcohol distributes through body water, so body size and make-up affect concentration.
- Your sex. On average, women tend to reach higher blood alcohol levels than men from the same amount, due to differences in body composition and enzymes.
- Your age. Metabolism tends to slow with age.
- Whether you ate. Food slows absorption, which changes the peak but not the underlying rate of clearance.
- Your liver health. The liver does most of the work, so liver problems can slow the process significantly.
- Medications. Some medicines interact with alcohol and can affect how it is processed.
- How regularly you drink. Regular heavy drinkers may process alcohol somewhat differently, but this does not make drinking safer, and it often points to tolerance, which is its own concern.
Because so many factors are involved, no online calculator or rule of thumb can tell you precisely when your system is clear. The figures are useful for understanding, not for making decisions where safety or the law is involved.
Why You Cannot Use This to Decide If You Are Safe to Drive
This is the part that matters most, so we will say it plainly.
You cannot reliably work out from any of this whether you are under the drink-drive limit or safe to drive. The variation between people is too large, the rate at which different people clear alcohol differs, and even small amounts can affect your reaction times and judgement.
A common and dangerous mistake is driving the morning after a heavy night, feeling fine, and assuming the alcohol has gone. As we have seen, it may not have. Many drink-drive offences happen the next day for exactly this reason.
The only genuinely safe approach is not to drive if you have been drinking, and to leave a generous margin afterwards. If there is any doubt at all, do not drive. No appointment or convenience is worth the risk to you or to someone else.
A Quiet Word, If You Are Asking This for a Different Reason
Most people who search this question have a simple, practical reason for asking. But some people land here for a quieter one. They are starting to wonder why alcohol seems to hang around longer than it used to, why the hangovers are worse, why they still feel it the next day, or why they keep needing to ask the question at all.
If that is you, it is worth pausing on. Frequently checking how long alcohol stays in your system can be a sign that drinking has become a bigger presence in your life than you are fully comfortable with. That is not a judgement. It is just something worth noticing honestly.
Wondering about your own drinking does not mean you have a problem, and it does not mean you need rehab. It simply means it might be worth getting a clearer picture. A confidential assessment is a low-pressure way to do that, and there are no wrong answers in it.
Understanding the Difference Between Tolerance and Safety
One thing worth clearing up, because it trips a lot of people up.
If you drink regularly, you may notice that you feel the effects of alcohol less than you used to. That is tolerance, and people often mistake it for being able to handle alcohol better, or for clearing it faster. Neither is quite true.
Tolerance changes how alcohol feels, but it does not meaningfully change the amount in your bloodstream or how long it takes to clear. So someone with high tolerance can feel relatively sober while still being well over a safe or legal limit. Tolerance is also one of the recognised signs that drinking may be becoming a problem, because it usually means the body has adapted to regular heavy use.
If any of that resonates, our resources explain what dependence looks like, and how it differs from ordinary heavy drinking.
If You Are Thinking About Cutting Down
If reading this has prompted you to think about reducing or stopping, that is a positive step, but there is one important safety note to be aware of.
If you drink heavily, daily, or have been drinking for a long time, do not stop suddenly without advice. Sudden withdrawal from alcohol can be medically serious for people who are dependent. Speak to your GP, a local alcohol service, or our team first, so you can plan a safe approach.
For people who are medically stable and want structure and support, our online recovery programme offers therapy, group support, and practical tools. For those who may need a supervised detox or residential care, our treatment placement service can help you find the right setting.
In Summary
Alcohol leaves the body at a fairly fixed and fairly slow rate, roughly one unit an hour on average, and nothing reliably speeds that up. It can be detected for hours in the blood, breath, and saliva, longer in urine with specialist tests, and for weeks in hair. But because the variation between people is so large, these figures are for understanding, not for deciding whether you are safe or legal to drive. And if you find yourself asking the question often, it may be worth taking an honest look at your drinking, with no pressure and no judgement.
Your Next Step
Curious about your drinking, not just the timings?
If you found yourself reading this for reasons beyond a simple practical question, it might be worth taking an honest look. There is no pressure and no judgement, just a clearer picture and a sense of what, if anything, you might want to do next.
Take a confidential assessment or contact us for a private, supportive conversation whenever you are ready.