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BAC Calculator

Estimate your blood alcohol concentration based on your drinks, timing, and profile.

United Kingdom80 mg/100 ml (0.08% / 0.8‰) legal limit*Methodology & sourcesView full methodology

Educational estimate only. Not legal advice, not a breath test, and not a safety test. Do not use this to decide whether to drive a vehicle, work, operate equipment, or perform safety-sensitive activities.

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* Legal limits vary by driver type, vehicle and state. This tool cannot determine legal driving status.

Last updated: April 25, 2026

United Kingdom drink-drive limits

UK Constituent Countries

BAC Calculator FAQ

What does this page show for first-offence drink-driving penalties?

This page does not claim to be one complete national sentencing schedule for every fact pattern. Instead, it shows verified penalty types relevant to the first-offence policy context. UK sentencing is carried out by magistrates courts under the Road Traffic Offenders Act 1988 and the Magistrates' Courts Sentencing Guidelines.

  • Fines (unlimited for offences tried by magistrates courts since 2015).
  • Driving disqualification (mandatory minimum 12 months for a first offence under RTA 1988 s.34).
  • Driving ban with possible rehabilitation course option to reduce disqualification.
  • Imprisonment (up to 6 months on summary conviction for s.5(1)(a) RTA 1988).
  • A criminal record.
Does a first UK drink-driving conviction automatically result in a criminal record?

Yes. A drink-driving conviction in the United Kingdom is a criminal conviction. This page includes criminal-record consequences as part of the standard first-offence context. This distinguishes the UK from some EU jurisdictions where a first offence at lower BAC levels may be treated as a purely administrative matter.

  • A conviction for driving with excess alcohol (Road Traffic Act 1988 s.5(1)(a)) is a criminal conviction.
  • The conviction will appear on the offender's criminal record.
  • It is also recorded on the DVLA driving licence record for 11 years.
  • This FAQ includes a criminal-record consequence in the first-offence context.
What does this page show for repeated or more serious drink-driving penalties?

The verified UK source set confirms which criminal consequence categories are relevant to repeated offences. A second drink-driving conviction within 10 years triggers a mandatory minimum 3-year disqualification under RTA 1988 s.34(3). This FAQ shows those consequence categories rather than inventing one uniform sentence for every scenario.

  • Mandatory minimum 3-year disqualification for a second conviction within 10 years.
  • Imprisonment (up to 6 months on summary conviction; unlimited fine).
  • Possible extended driving test requirement before licence is returned.
  • High-risk offender scheme applies in some circumstances, requiring medical examination before licence restoration.
Is vehicle seizure or forfeiture shown as an automatic UK outcome?

This FAQ does not present automatic vehicle forfeiture as a standard first-offence consequence. Courts have discretion to order forfeiture under the Powers of Criminal Courts (Sentencing) Act 2000, but that is not presented here as a mandatory automatic outcome.

  • No automatic vehicle forfeiture threshold is shown for the current public England/Wales/NI context.
  • Courts retain discretionary powers, but this FAQ does not try to cover every discretionary outcome.
What about causing death by careless or dangerous driving while under the influence?

This page does not include the causing-death offence (Road Traffic Act 1988 s.3A) as part of the standard calculator context. That offence carries up to 14 years imprisonment and a mandatory 2-year disqualification and is a distinct Crown Court matter. This FAQ covers drink-driving detection and over-limit offences, not fatal-consequence offences.

  • Causing death by careless driving while over the drink-drive limit: up to 14 years imprisonment (RTA 1988 s.3A).
  • This FAQ covers standard over-limit detection, not fatal-consequence offences.
ScenarioQualificationCustodyDriving restrictionFinancial or other consequence
England/Wales/NI first offence — excess alcohol (RTA 1988 s.5(1)(a))BAC at or above 80 mg/dL standard-driver thresholdUp to 6 months imprisonment (summary conviction)Mandatory disqualification minimum 12 months; driving ban with optional rehabilitation courseUnlimited fine; criminal record; DVLA endorsement for 11 years
England/Wales/NI second offence within 10 yearsSecond conviction under RTA 1988 s.5(1)(a) within 10-year periodUp to 6 months imprisonment; possible extended test requirementMandatory minimum 3-year disqualification; possible high-risk offender medical reviewUnlimited fine; criminal record; DVLA endorsement extended
Scotland first offence — excess alcoholBAC at or above 50 mg/dL Scotland threshold (SSI 2014/285)Up to 6 months imprisonment (summary conviction)Mandatory disqualification minimum 12 monthsUnlimited fine; criminal record
How many road casualties in Great Britain were attributed to drink-driving in the most recent official data?

The official Department for Transport statistics show drink-driving remains a significant cause of road deaths and serious injuries, though long-term trends show improvement from peak levels.

  • The Department for Transport central estimate for 2023 was 260 deaths in reported collisions where at least one driver was over the drink-drive limit.
  • That represented 15.8% of all road fatalities in the reporting period.
  • Killed or seriously injured drink-drive casualties were estimated at 1,860 in 2023.
  • All drink-drive casualties of all severities were estimated at around 6,310 in 2023.
  • Long-term trend: drink-drive deaths have fallen substantially since the 1980s when annual totals exceeded 1,500.
How complete are UK breath-test and enforcement datasets?

Official Department for Transport guidance warns that some breath-test data are incomplete because not all police forces provide the same data coverage.

  • DfT collision estimates use police collision records, toxicology data for road deaths, and breath-test information where available.
  • Individual breath-test readings are not provided by all police forces, so those data do not cover England and Wales as a whole.
  • This FAQ therefore treats national casualty estimates as the main official trend indicator rather than claiming one complete enforcement count.
Has the lower Scottish limit (50 mg/dL) produced measurable enforcement changes?

Yes. Scottish Government data published after the 2014 limit reduction showed both increased police testing and a higher proportion of positive tests close to the new lower threshold.

  • Road Safety Scotland reported a measurable increase in the proportion of drink-drive cases between 50 and 80 mg/dL after the December 2014 change.
  • This confirms that the lower limit captures a population of drivers who would have been below the England/Wales/NI threshold.
  • Fatal drink-drive accidents in Scotland have remained broadly stable in the years following the limit change, though absolute numbers are small.
Do most people in the UK say it is acceptable to drive after drinking alcohol?

No. British Social Attitudes data and THINK! campaign research consistently show the vast majority of adults consider drink-driving to be unacceptable.

  • THINK! campaign research has consistently shown over 90% of respondents consider drink-driving unacceptable.
  • The stated social norm strongly opposes the behaviour, though self-reported behaviour sometimes diverges from stated attitudes.
Is next-morning or morning-after drink-driving a concern in UK research?

Yes. UK road safety charities and police forces have highlighted next-morning drink-driving as a significant but under-appreciated risk, particularly among men who drink heavily the evening before.

  • IAM RoadSmart surveys have found a significant minority of UK drivers underestimate how long alcohol remains above the legal limit the morning after drinking.
  • Police campaigns such as "the morning after" target this specific behaviour pattern.
  • UK research suggests this is particularly prevalent among men in the 25–44 age group.
Did attitudes in Scotland change after the limit was lowered to 50 mg/dL in 2014?

Scottish Government and Road Safety Scotland surveys indicate broad public awareness of the change and general support for the stricter limit, though some ambiguity remains about how it affects social drinking norms.

  • Road Safety Scotland reported high awareness of the 50 mg/dL limit in post-implementation surveys.
  • A majority of Scottish respondents supported the lower limit in principle.
  • Some respondents expressed uncertainty about practical implications for behaviour at evening events.
What is the latest dated legal-change entry for the United Kingdom calculator context?

The latest dated entry is the legal-source review of March 16, 2026. That review confirms that the 80 mg/dL England/Wales/NI context remained aligned with the verified source set on that date. No new primary legislation changing the prescribed limit in England, Wales or Northern Ireland has been enacted as of that date. The Scotland 50 mg/dL limit has been in force since 5 December 2014 and was reconfirmed in the same review.

  • Source review date: March 16, 2026.
  • The 80 mg/dL England/Wales/NI context was reconfirmed as current.
  • The Scotland 50 mg/dL limit (in force since 5 December 2014) was also reconfirmed.
  • No new parliamentary reform of the Road Traffic Act 1988 prescribed limits was identified in this review.
  • This FAQ does not include a newer dated nationwide reform entry beyond this source review.

Source:Official source links are listed in the relevant sections. Check the current wording before relying on any legal detail.

Jurisdiction Details

Verification: primary | last verified: 2026-03-08

Policy-driven educational estimate only. Legal meaning depends on jurisdiction, driver class, and local enforcement.

Primary Legislation