New Zealand

Blood Alcohol Calculator NZ – Standard Drinks & 0.05% Limit 🇳🇿

Calculate your estimated Blood Alcohol Concentration (BAC) instantly. Track standard drinks, view sobriety charts, and check your status against New Zealand's 0.05% legal limit (zero tolerance under 20).

0.05% BAC Legal limit

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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}} 🍷

%

Maximum number of drinks reached.

The results will show up here...
📈 Results
Current BACPeak BAC {{ initialSobriety }}{{ unitSign }} Measured for Now · Legal limit {{ countryLimit }}{{ unitSign }}
Status:
Above the legal limit – do not drive. Close to the legal limit – driving not recommended. Safe to drive, but stay cautious.
{{ legalLimitTimeLabel }}

Legal limit

{{ countryLimit }}{{ unitSign }}
Based on NZ law ·

Elimination rate

{{ decayRateDisplay }}{{ unitSign }} / h
Assumed average

Standard Drinks

{{ standardDrinks }}🍺
Approx. consumed

Pure Alcohol

{{ results.length > 0 ? results[0].pureAlcoholMl : '0' }} {{ qunits }}
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 }} Measured for Now · Legal limit {{ countryLimit }}{{ unitSign }}
Status:
Above the legal limit – do not drive. Close to the legal limit – driving not recommended. Safe to drive, but stay cautious.
{{ legalLimitTimeLabel }}
{{ 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
👮 Health impact and legal consequences
{{ item.title }}
{{ legalLimitTimeLabel }} Sober in: {{ sobrietyTime }} 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 shows your estimated blood alcohol concentration right now as a percentage. This number reflects how much alcohol is in your bloodstream and is used to assess impairment.

Legal limit

In New Zealand, the legal driving limit for drivers aged 20 and over is 0.05% BAC (250mcg per litre of breath / 50mg per 100ml of blood). Drivers under 20 have a zero limit (0.00%). Exceeding the limit can result in infringement fees, demerit points, fines, and licence disqualification.

Elimination rate

This shows the assumed average rate your body metabolizes alcohol — typically ~0.015 % BAC per hour. It’s an estimate of how fast your BAC decreases over time.

Standard Drinks

The number of Standard Drinks represents the approximate number of typical servings you’ve consumed. In New Zealand, one standard drink contains 10 grams of alcohol.

Pure Alcohol

This is the amount of pure alcohol (in ounces/grams) your body has absorbed so far, giving you a measure of total alcohol consumed.

Time vs. Sobriety Table

The table lists how your BAC is expected to change with each hour passed — and when a Start time of drinking is provided, it aligns these estimates with the exact time of day you began drinking. For example, if you started at 6:00 PM, the column will show your projected BAC at 6:00 PM (Now), 7:00 PM (1h), 8:00 PM (2h), etc., so you can clearly see when your BAC is likely to cross legal and safer thresholds as the day progresses. Icons or status indicators show whether the level is safe for driving at those specific clock times, making it easier to plan your departure or rest period.

Sobriety Over Time Graph

A visual line chart plotting your estimated BAC decline over hours. It helps you see when your BAC drops below legal and safer levels.

How Alcohol Affects You

This reference table shows ranges of BAC and typical effects on your body and behaviour — from mild alertness changes to significant impairment at higher levels.

Legal limit reached in / Sober in / Peak BAC

These summaries give quick key estimates:

  • Legal limit reached in: the time until your BAC likely falls below the legal driving limit.

  • Sober in: total time until BAC reaches ~0.000 %.

  • Peak BAC: the highest BAC value recorded 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.
LIMITS NEARBY

BAC limits in neighboring countries

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

AU

Australia

0.05%
Moderate
UK

United Kingdom

0.08%
Relaxed
US

United States

0.08%
Relaxed
JP

Japan

0.03%
Strict
TH

Thailand

0.05%
Moderate

Drink Driving in New Zealand

Legal alcohol limits for New Zealand drivers

Drivers 20 & over
0.05%
Moderate
Drivers under 20
0.00%
Zero tolerance
Drivers aged 20 and over must stay under 250mcg of alcohol per litre of breath (50mg per 100ml of blood), equivalent to 0.05% BAC. Drivers under 20 have a zero alcohol limit — any alcohol is an offence. Compulsory Breath Testing is enforced by NZ Police nationwide.

Common Penalties in New Zealand

Consequences of exceeding the legal alcohol limit

250–400mcg breath / 50–80mg blood (drivers 20+, infringement)
  • $200 infringement fee and 50 demerit points
  • No court appearance or conviction in this band
  • Drivers under 20: $200 + 50 points for any alcohol; criminal charge above 150mcg / 30mg
Over 400mcg breath / 80mg blood (court)
  • Criminal conviction — fine up to NZ$4,500 and/or up to 3 months imprisonment (first offence)
  • Mandatory disqualification of 6+ months
  • Repeat offences: up to NZ$6,000, 2 years imprisonment and an alcohol interlock

Source: NZ Transport Agency / NZ Police.

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: Health New Zealand / NZ Transport Agency.

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