Alcohol and health
Cider and driving
How much cider can I drink and still drive?
In short
There is no answer to that question that CiderHQ or anyone else can give you. No calculation from units, body weight, time elapsed or how you feel establishes an individual’s blood alcohol concentration, and none of them establishes that you are safe to drive.
The legal limits differ within the United Kingdom: Scotland has a lower limit than England, Wales and Northern Ireland, and a driver who is under the limit in one is not necessarily under it in the other.
Impairment begins below every legal limit. The limits define an offence; they do not define a level at which driving is unaffected.
The limits, and where they differ
Scotland reduced its drink-drive limit in December 2014. The limit there is 50 milligrams of alcohol per 100 millilitres of blood, 22 microgrammes per 100 millilitres of breath, and 67 milligrams per 100 millilitres of urine.
In England, Wales and Northern Ireland the limit remains 80 milligrams per 100 millilitres of blood, 35 microgrammes per 100 millilitres of breath, and 107 milligrams per 100 millilitres of urine.
The practical significance for a driver is that crossing the border changes the legal position without anything changing in the vehicle or in the driver. A driver who is lawfully under the limit in Carlisle may be over it in Gretna.
Limits elsewhere differ again, and several European countries operate lower general limits and stricter limits for novice and professional drivers. Anyone driving in another jurisdiction should check that jurisdiction’s current rules with its own authority.
| Jurisdiction | Blood | Breath | Urine |
|---|---|---|---|
| Scotland | 50 mg / 100 ml | 22 µg / 100 ml | 67 mg / 100 ml |
| England | 80 mg / 100 ml | 35 µg / 100 ml | 107 mg / 100 ml |
| Wales | 80 mg / 100 ml | 35 µg / 100 ml | 107 mg / 100 ml |
| Northern Ireland | 80 mg / 100 ml | 35 µg / 100 ml | 107 mg / 100 ml |
Why cider makes the estimate worse
The strength range is wide, and cider is often served without an ABV shown. A drinker who does not know whether they have had 4.5 per cent or 7.5 per cent cider cannot estimate their intake within a factor of nearly two.
Cider is served in beer measures. A pint of 7.5 per cent cider is about 4.3 UK units, which is more alcohol than most people associate with a single glass of anything.
Sweetness, fruit character and carbonation reduce the perception of strength, so the internal sense of how much has been drunk is systematically unreliable for sweet strong ciders.
Draught and farm cider varies between batches, and mulled or mixed drinks have no determinable strength at all.
The morning after
Alcohol is eliminated at a roughly constant rate that cannot be accelerated, so a person who drank heavily in the evening may still have a blood alcohol concentration above a legal limit the following morning. Sleep does not clear alcohol; it merely removes the subjective sense of being affected.
This is the situation in which drivers are most often caught out, because the feeling of impairment has largely passed while the concentration has not. It is also the situation in which self-assessment is least reliable, because the drinker feels normal.
There is no method of calculating when a specific person will be below a limit. Where any doubt exists, the position is unresolved, and driving on an unresolved position is a decision with consequences for other people as well as for the driver.
What the limit is not
A legal limit is a threshold for an offence, set by legislators balancing enforcement, evidence and public acceptability. It is not a scientific finding that driving below it is unaffected by alcohol.
Measurable impairment of reaction time, judgement and divided attention begins at blood alcohol concentrations below every limit in force in the United Kingdom. A driver who is under the limit may still be impaired, and may still be prosecuted for driving while unfit through drink, which is a separate offence from being over the prescribed limit.
CiderHQ states this because the framing of the question — "how much can I drink and still drive" — presupposes that there is a safe quantity to be identified. There is not one that can be identified for an individual, and the presupposition is the part of the question that is wrong.
Also answered on this page
Questions this page covers, so you can tell at a glance whether it is the one you want.
- What is the drink-drive limit in Scotland?
- How long after drinking cider can I drive?
- Is one pint of cider under the limit?
Related
What people ask next
Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.
- How do you work out the units in a cider, and why do uk and us measures differ — A UK unit is 10 ml — about 8 grams — of pure ethanol, and units are calculated by multiplying the volume in litres by the ABV. A 568 ml pint at 6 per cent is 3.4 units.
- What does the body do with alcohol, and why is it’s only cider a mistake at 7.5 per cent — Ethanol is absorbed from the stomach and small intestine into the bloodstream within minutes, and it is eliminated chiefly by liver enzymes at a rate that is roughly constant and cannot be increased at will.
- What questions does ciderhq refuse to answer, and why
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
GOV.UK · government · passage verified 2026-08-24
Read on 2026-08-24. The address CiderHQ had registered, gov.uk/drink-driving-law, now returns 404; the page is at gov.uk/drink-drive-limit and the record is corrected. Two things it establishes matter here. The limit is set at constituent-country level rather than at state level — Scotland’s is materially lower than England, Wales and Northern Ireland’s — which is the clearest single justification for modelling the four countries separately under the United Kingdom. And the page states plainly that no arithmetic converts drinks into a blood alcohol level for an individual, which is why CiderHQ’s unit calculator will not attempt one.
NHS · health authority · passage verified 2026-08-24
The definition CiderHQ’s units calculator implements, read against the page rather than assumed: one UK unit is 10 ml or 8 g of pure ethanol, and units are ABV multiplied by volume in millilitres divided by a thousand — which is exactly the arithmetic in `engine/calculators.ts`.
World Health Organization · health authority · passage verified 2026-08-24
The basis for CiderHQ publishing no health benefits for alcohol. Note carefully what this page does and does not carry: it states that no form of alcohol consumption is risk-free and that alcohol is an established carcinogen, but it does not itself set out the IARC classification. That is cited to IARC directly — see `iarc-alcohol-monograph`. The distinction matters because CiderHQ’s own rule is that a source is cited for what it actually says.
A description of what is known, written for readers of legal drinking age. It is not medical advice and it is not an encouragement to drink. CiderHQ publishes no health benefits for alcohol, because current guidance from the major health authorities does not support them. For advice about your own drinking, speak to your national health service. Our policy on alcohol.
Where to go next
- Alcohol and health — The rest of this section, and the position the whole of it is written from.
- Our policy on alcohol — What CiderHQ will and will not publish about drinking, and the reasoning behind it.
- How strong cider is — The strength range cider actually covers, and what drives it.