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Scotland

Scotland Drink Drive Calculator 🏴󠁧󠁢󠁳󠁣󠁴󠁿

Calculate your blood alcohol level against Scotland's stricter 50mg/100ml limit. Our free BAC calculator shows when you'll be legal to drive based on your weight, gender, and drinks consumed.

50 mg/100 ml Legal limit

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Scotland's Drink Drive Limit – What You Need to Know — 50 mg/100 ml

Scotland's 50 mg/100ml blood limit (22 µg/100ml breath, 67 mg/100ml urine) has applied since December 2014 — lower than the 80 mg/100ml limit still in force in England, Wales and Northern Ireland. Police Scotland may breath-test any driver stopped for a moving offence; the safest course is zero alcohol before driving.

ℹ️ Information

CONTEXT
🌎 Country
Show results in
ABOUT YOU
Sex
⚖️ Weight

lbs

⏱️ Start time of drinking (optional) Time of your first drink (not required)

🕒

⏳ Or: hours ago —
0h6h12h18h24h

🍹🍸🍺 Drinks

Drink {{ index+1 }}

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%

≈ {{ servingHint(drink) }}

Maximum number of drinks reached.

The results will show up here...
📈 Results
Current BACPeak BAC {{ initialSobriety }}{{ unitSign }} Legal limit {{ countryLimit }}{{ unitSign }}
Safe Caution Impaired Intoxicated Dangerous
Above the legal limit – do not drive. Close to the legal limit – driving not recommended. Safe to drive, but stay cautious.
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Sober in: {{ sobrietyTime }}

Scotland's Drink Drive Limit – What You Need to Know

All drivers in Scotland 50 mg/100ml

Common Penalties for DUI/DWI Globally

Offence type No offence Below the legal limit – driving is permitted.
Offence type Over the 0.0 limit Zero-tolerance country — driving with any detectable alcohol is prohibited.
Offence type Over the legal limit You are over the legal limit and committing a drink-driving offence. Exact penalties depend on your BAC and local law.
Offence type Drink driving (criminal offence) 50–99 mg/100 ml Criminal offence from 50 mg/100 ml — conviction carries a mandatory minimum 12-month disqualification.
Typical penalties
  • Criminal offence — fine up to £5,000
  • Mandatory minimum 12-month driving ban
  • Up to 6 months imprisonment; 11-year endorsement
Offence type High-BAC drink driving 100+ mg/100 ml Criminal offence — may result in a criminal record.
Typical penalties
  • Bans of 18–24 months common; possible vehicle forfeiture
  • Higher likelihood of custodial sentence
  • Up to 14 years if death/serious injury caused
These are general penalties. Actual consequences may vary by local law and circumstances. Learn more →

Legal limit

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Scotland legal limit (50mg/100ml) ·

Elimination rate

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Assumed average

Standard Drinks

{{ standardDrinks }}🍺
Approx. consumed

Pure Alcohol

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Pure alcohol consumed

Pure Alcohol (g)

{{ alcoholGrams }} g
Total ethanol consumed

Calories

{{ calories }} kcal
From alcohol only — mixers add more

Time over limit

{{ timeOverLimit || '0m' }}
Estimated duration above the legal driving limit
For your own safety, we recommend using a rate no higher than the average.
Current BACPeak BAC {{ initialSobriety }}{{ unitSign }} Legal limit {{ countryLimit }}{{ unitSign }}
Safe Caution Impaired Intoxicated Dangerous
Above the legal limit – do not drive. Close to the legal limit – driving not recommended. Safe to drive, but stay cautious.
{{ legalLimitTimeLabel }}
Sober in: {{ sobrietyTime }}

Scotland's Drink Drive Limit – What You Need to Know

All drivers in Scotland 50 mg/100ml

Common Penalties for DUI/DWI Globally

Offence type No offence Below the legal limit – driving is permitted.
Offence type Over the 0.0 limit Zero-tolerance country — driving with any detectable alcohol is prohibited.
Offence type Over the legal limit You are over the legal limit and committing a drink-driving offence. Exact penalties depend on your BAC and local law.
Offence type Drink driving (criminal offence) 50–99 mg/100 ml Criminal offence from 50 mg/100 ml — conviction carries a mandatory minimum 12-month disqualification.
Typical penalties
  • Criminal offence — fine up to £5,000
  • Mandatory minimum 12-month driving ban
  • Up to 6 months imprisonment; 11-year endorsement
Offence type High-BAC drink driving 100+ mg/100 ml Criminal offence — may result in a criminal record.
Typical penalties
  • Bans of 18–24 months common; possible vehicle forfeiture
  • Higher likelihood of custodial sentence
  • Up to 14 years if death/serious injury caused
These are general penalties. Actual consequences may vary by local law and circumstances. Learn more →
{{ afterLabel }} {{ $t('unit.' + units) }} Status
{{ result.time }} {{ result.drunkenness }}
  • Safe to drive, but stay cautious.
  • Close to the legal limit – driving not recommended.
  • Above the legal limit – do not drive.
Create a pop-up notification

Sobriety Over Time

Your estimated BAC as your body clears the alcohol

Sober in {{ sobrietyTime }}
  • {{ lookaheadBacDisplay }}{{ unitSign }} Above the legal limit – do not drive. Close to the legal limit – driving not recommended. Safe to drive, but stay cautious.
  • {{ $t('unit.' + units) }}
  • Legal limit ({{ countryLimit }}{{ unitSign }})
👮 Health impact and legal consequences
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Peak BAC: {{ peakBAC }}

💡 Tips: drink water, eat, and avoid driving until below the legal limit and ideally sober.

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Attention‼️ The results are only approximate, so make sure you are sober before driving.

About results
Current BAC

Your Current BAC is the estimated alcohol in your blood, shown in mg per 100 ml — the unit Scotland’s limit is written in — or as a percentage. Police Scotland measure breath (µg/100ml); 22 µg breath corresponds to the 50 mg/100ml blood limit.

Legal limit

Scotland has enforced a 50 mg/100ml blood limit (22 µg/100ml breath, 67 mg/100ml urine) since December 2014 — lower than the 80 mg/100ml still in force in England, Wales and Northern Ireland. Police Scotland can breath-test any driver stopped for a moving offence, and because the limit is low, even one drink can put you over — the safest course is none.

Elimination rate

Your liver clears alcohol at a near-fixed 15 mg/100ml (0.015%) an hour, and nothing shortens it — coffee, a cold shower or a meal change how you feel while the reading falls just as slowly. With Scotland’s lower limit, that can leave you over the line well into the next morning.

Standard Drinks

In the UK one unit is 10 ml (8 g) of pure alcohol. Scotland’s lower limit leaves very little room: a 568 ml pint of strong lager is around 3 units, so even a single pint can carry many drivers to or past 50 mg/100ml.

Pure Alcohol

The pure alcohol (in grams) your body has absorbed so far — the basis for both your unit count and your BAC.

Time vs. Sobriety Table

The table projects your BAC each hour, and with your first-drink time it maps them onto the clock — useful the morning after, showing when you fall back under 50 mg/100ml. Status icons mark the safe-to-drive hours.

Sobriety Over Time Graph

A line chart of your BAC declining over the hours ahead, showing when it drops below Scotland’s 50 mg/100ml limit and then to zero.

How Alcohol Affects You

A reference table matching BAC ranges to their typical effects on judgement, coordination and reaction time — impairment that begins well below the limit.

Legal limit reached in / Sober in / Peak BAC

Quick summary estimates:

  • Legal limit reached in: time until your BAC falls below Scotland’s 50 mg/100ml limit.

  • Sober in: time until it returns to ~0.

  • Peak BAC: the highest level reached in the session.

Data used for calculations

Five factors that determine your result

Weight
Body weight determines how alcohol distributes in the body — more weight means a lower blood alcohol concentration.
Sex
Men and women metabolise alcohol at different rates because of differences in body water content.
Amount
The amount of pure alcohol consumed is the main factor that determines your BAC result.
Strength
A higher strength (%) means more ethanol in the same drink serving.
Time
The time of your first drink shows how BAC changes hour by hour and when you'll be sober again.

How much does Scotland drink?

Alcohol consumption per adult, per year

10.9L

litres of pure alcohol per adult (15+), per year

Per adult, that is roughly:

384 beers ≈ 7/week
606 glasses of wine ≈ 12/week
681 shots ≈ 13/week
10.9 L
0.7 L Ø 8.9 17.1 L

23% above the regional average

Ranks #18 of 51 in Europe Ranks #23 of 188 in the World Average in Europe: 8.9 L

WHO reports this figure for the UK as a whole.

How neighbours compare

#1 France 11.2L #12 Europe
#2 Scotland 10.9L #18 Europe
#3 United Kingdom 10.9L #18 Europe
#4 Ireland 10.5L #22 Europe
#5 Netherlands 8.7L #30 Europe
#6 Norway 7.5L #35 Europe

How safe are the roads in Scotland?

Road traffic deaths per 100,000 people, per year

2.4 /100k

road traffic deaths per 100,000 people, 2021

~40% of road deaths linked to alcohol WHO estimate, 2019 · 28–56%
31 road deaths per week WHO estimate, 2021
12 alcohol-linked deaths per week WHO-derived estimate
2.4
0.0 Ø 6.7 17.2

64% fewer road deaths than the regional average

#6 safest of 53 in Europe #9 safest of 195 worldwide Average in Europe: 6.7 per 100k

WHO reports this figure for the UK as a whole.

How neighbours compare

#1 Norway 1.6 #2 Europe
#2 Scotland 2.4 #6 Europe
#3 United Kingdom 2.4 #6 Europe
#4 Ireland 3.2 #10 Europe
#5 Netherlands 3.2 #11 Europe
#6 France 4.6 #19 Europe

Latest available year shown per country.

LIMITS NEARBY

BAC limits in neighbouring countries

Explore the legal blood alcohol concentration (BAC) limits for drivers in neighbouring countries.

UK

United Kingdom

80mg/100 ml
Relaxed
IE

Ireland

50mg/100 ml
Moderate
NO

Norway

20mg/100 ml
Strict
FR

France

50mg/100 ml
Moderate
NL

Netherlands

50mg/100 ml
Moderate

Scotland's Drink Drive Limit – What You Need to Know

Scotland's legal drink-drive limit (blood)

All drivers in Scotland
50mg/100ml
Moderate
Scotland's 50 mg/100ml blood limit (22 µg/100ml breath, 67 mg/100ml urine) has applied since December 2014 — lower than the 80 mg/100ml limit still in force in England, Wales and Northern Ireland. Police Scotland may breath-test any driver stopped for a moving offence; the safest course is zero alcohol before driving.

Common Penalties for DUI/DWI Globally

Consequences of exceeding Scotland's 50mg/100ml limit

50–99 mg/100 ml
Drink driving (criminal offence)
  • Criminal offence — fine up to £5,000
  • Mandatory minimum 12-month driving ban
  • Up to 6 months imprisonment; 11-year endorsement
100+ mg/100 ml
High-BAC drink driving
  • Bans of 18–24 months common; possible vehicle forfeiture
  • Higher likelihood of custodial sentence
  • Up to 14 years if death/serious injury caused

Tips for Responsible Drinking

Practical tips for safer drinking

Pace yourself
Stick to the "one drink per hour" rule – your liver needs time to process alcohol.
Eat before and while drinking
A solid meal slows alcohol absorption – an empty stomach raises BAC faster.
Drink water
After each alcoholic drink, have a glass of water – it reduces dehydration and health risks.
Don't drive
Even small amounts of alcohol impair reaction time. If in doubt, call a taxi or stay overnight.

Source: World Health Organization (WHO).

How we calculate your BAC

The exact formula, step by step

Your result is not a guess. It comes from the Widmark equation, the same formula forensic toxicologists use in court. Here it is, worked through with an example.

BAC = A ÷ (r × W) − (β × t)

where A = grams of pure alcohol, r = body-water factor (0.68 for men, 0.55 for women), W = weight in kg, β = elimination rate (~0.15 g/L per hour), and t = hours since your first drink.

  1. Pure alcohol (A). Three 500 ml beers at 5% ABV hold 3 × 500 × 0.05 × 0.789 ≈ 59 g of pure alcohol.
  2. Body water (r × W). For an 80 kg man: 0.68 × 80 = 54.4.
  3. Peak level. A ÷ (r × W) = 59 ÷ 54.4 ≈ 1.09 g/L — the same as 1.09‰ or about 0.11% BAC.
  4. Subtract elimination. After 2 hours: 1.09 − (0.15 × 2) = 0.79 g/L.

The calculator runs this same equation on your own weight, sex, drinks and timing — the numbers above are only a worked example. Method based on E. M. P. Widmark (1932); results are an estimate, not a legal measurement.

What people actually log

SmartBAC has run over 17,000 calculations in recent weeks. Of every drink people log, beer is the most common by far — about 6 in 10 — ahead of spirits and then wine.

Anonymous, aggregated first-party usage data from SmartBAC, July–August 2026.

FAQ

How long does it take for a BAC of 0.1% to leave the body in Scotland?
The body typically eliminates alcohol at approximately 0.015% BAC per hour (roughly one UK unit per hour). For a BAC of 0.1% (100mg/100ml), it would take roughly 6-7 hours to fully metabolise. However, at 100mg/100ml, you're double Scotland's legal limit (50mg/100ml).
How can I sober up faster to meet Scotland's limit?
You cannot speed up alcohol metabolism. Drinking water, coffee, eating food, or taking a cold shower may help you feel more alert, but only time will reduce your BAC. Your liver metabolizes alcohol at a fixed rate of approximately 0.015% per hour. With Scotland's stricter limit, patience is essential.
What is the margin of error for breathalyzers in Scotland?
Police breathalyzers in Scotland typically have a margin of error of ±2 micrograms per 100ml of breath or ±6mg per 100ml of blood. A reading of 22µg/100ml (Scotland's limit) could range from 20-24µg/100ml. However, this margin does not exempt you from prosecution if you exceed the legal threshold.

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