What's the driving limit?

0.08 percent in most US states and UK England/Wales. 0.05 percent in Scotland, most EU countries, Australia, India officially, Japan. 0.02 percent for novice drivers in many countries. 0.00 percent in Saudi Arabia, UAE, and Pakistan — because alcohol itself is illegal entirely in those jurisdictions, any positive reading is a legal problem regardless of perceived impairment.

Does coffee, food, water sober you up faster?

No, no, and no. Coffee makes you a more alert drunk person, not a sober one. Food slows absorption if eaten before drinking, but does nothing to speed elimination once alcohol is already in your bloodstream. Water helps with the hangover (alcohol is dehydrating) but doesn't lower BAC faster. Time is the only sober-er — your liver processes roughly 0.015 percent per hour, full stop.

Why are women affected more?

Two biological reasons that compound. First, lower body water content (around 55 percent vs 68 percent in men) — alcohol distributes through body water, so the same dose hits a higher concentration in a smaller water volume. Second, lower stomach alcohol dehydrogenase enzyme activity, meaning less first-pass metabolism. Same drink, same weight, roughly 25 percent higher BAC in a woman.

Is BAC the same as breathalyzer reading?

Approximately, but not exactly. Breathalyzers measure breath alcohol concentration (BrAC) and convert via a fixed ratio (2,100 to 1 in the US). Real BAC measured from a blood draw is the gold standard for legal proceedings; BrAC is convenient and portable but runs about 10 percent less accurate. In court, blood beats breath every time.

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Blood Alcohol Content (BAC) Calculator

Health

Estimate blood alcohol content from drinks consumed using the Widmark formula. Time-decay adjustment + legal threshold reference.

Health

Blood Alcohol Content (BAC) Calculator

Generated on July 8, 2026

Educational estimate only. The Widmark formula has ±20% individual variability. Don't use this to decide whether to drive. Never drink and drive.Alcohol is haram in Islam — this calculator may be useful for emergency / medical contexts only.

Body weight

Sex (affects body water content)

Drinks consumed

Drink size (ml)

ABV %

Number of drinks

Hours since first drink

Body eliminates ~0.015% BAC per hour

Save / share— download or share to WhatsApp, Facebook & more

Premium Converters

BAC Estimate

0.058% BAC — Mild impairment

Generated

7/8/2026

Mild impairment

0.058 % BAC

0.58 ‰ (EU)58 mg/dL

Time to fully sober: 3.9 hrs

BAC gauge

Decay over time

Step-by-step calculation

Formula

Widmark formula: BAC% = (alcohol_g / (weight_g × r)) × 100, where r = 0.68 (male) or 0.55 (female). Subtract 0.015% per hour for elimination.

1Total alcohol: 355 ml × 5% × 0.789 g/ml × 3 drinks = 42.0 g.
2Widmark r factor: 0.68 (male).
3BAC raw = 42.0 / (70.0 × 1000 × 0.68) × 100 = 0.0883%.
4Subtract elimination: 2 hours × 0.015%/hr = 0.030%.
5Final BAC: 0.0583%.
6US driving threshold: 0.08% in most states. Pakistan, Saudi Arabia, UAE: 0.00% (alcohol illegal). Most of EU: 0.05%.

1 min readHow we build →

Quick Answer

Estimate blood alcohol content from drinks consumed using the Widmark formula. Time-decay adjustment + legal threshold reference.

How the Blood Alcohol Content (BAC) Calculator works

Health

Formula

Widmark: BAC% = (alcohol_g / (weight_g × r)) × 100. r = 0.68 (male), 0.55 (female). Subtract 0.015% per hour for liver elimination.

By Muhammad Salman SaleemMethodologyNo sign-up, no tracking · Calculated on your device, not our servers

Before you start — a few notes

Most people don't open a BAC calculator while sober — they open it on the drive home from a friend's wedding in Karachi or a cousin's reception in Toronto, slightly panicked, wondering if they're actually fit to drive. Honest answer first: if you're asking the question, you almost certainly shouldn't. The Widmark formula behind every BAC estimate has plus or minus 20 percent individual variability — it doesn't know your stomach contents, your liver health, your genetics (ALDH2 variants are common in East Asian populations and dramatically affect alcohol metabolism), or any medications you're on. The calculator gives you an estimate; a breathalyzer gives you a measurement; neither replaces 'just don't drive'. Note for context: alcohol is haram in Islam, and this calculator is provided primarily for emergency, medical, and educational situations — not as a guide to 'safe' drinking. If you're in Pakistan, Saudi Arabia, UAE, or any country where the driving limit is zero and alcohol itself is illegal, no BAC number above zero is legally acceptable. Even in countries with non-zero limits, impairment starts well before 0.08 percent — reaction time, judgment, and vision are measurably compromised at 0.04 percent. Coffee doesn't help. Cold showers don't help. Eating doesn't speed elimination once alcohol is in your bloodstream. Your liver processes about 0.015 percent per hour and there is no way to speed it up — time is the only sober-er. If you're estimating BAC to decide whether to drive: the answer is no, get a Careem, take a taxi, call your brother. Two hours of inconvenience is cheaper than a license suspension, an accident, or a life.

Pro tips most people learn the hard way

Time is the only thing that lowers BAC. Coffee makes you a more alert drunk person, not a sober one. Food slows absorption if eaten before drinking, but doesn't speed elimination once alcohol is in your bloodstream. Your liver processes about 0.015 percent per hour — that's it, no shortcuts, no magic juice, no cold shower.
Individual variability is plus or minus 20 percent. Factors the formula can't see: food in stomach, genetics (ALDH2 variants are very common in East Asian populations and dramatically affect alcohol metabolism), liver health, hydration, medications. Don't rely on a calculator to decide whether you can drive — that's not what the math is built for.
Pakistan, Saudi Arabia, UAE, and most Gulf states have zero-tolerance driving limits because alcohol itself is illegal. Any BAC above zero is a legal problem, regardless of perceived impairment. If you've been drinking and you're in any of these jurisdictions, taking transport home isn't a precaution — it's the only legal option.
Women hit higher BAC than men of the same weight after the same drinks — typically about 25 percent higher. The reason is biological: lower body water content (around 55 percent vs 68 percent in men) and lower stomach alcohol dehydrogenase enzyme activity. Same drink, more in the bloodstream.
Impairment starts well before the legal limit. Reaction time, judgment, and visual tracking are measurably compromised at 0.04 percent BAC — half the US driving threshold. 'I feel fine' is the worst possible self-assessment because alcohol impairs the very judgment you'd use to assess yourself. If in doubt, don't drive. Take the Careem.

?What is the Blood Alcohol Content (BAC) Calculator?

The Blood Alcohol Content (BAC) Calculator estimates blood alcohol concentration from drinks consumed, body weight, sex, and time elapsed using the Widmark formula — the same equation used by toxicologists since 1932. Reports BAC in three common units (%, ‰ per mille, mg/dL) and indicates impairment level relative to the US driving threshold (0.08%). Educational only — individual variability is ±20%, and any amount of alcohol impairs driving. Note: alcohol is haram in Islam; this calculator is provided for emergency, medical, and educational contexts.

The Formula

Widmark: BAC% = (alcohol_g / (weight_g × r)) × 100. r = 0.68 (male), 0.55 (female). Subtract 0.015% per hour for liver elimination.

Erik Widmark (Sweden, 1932) derived this from cadaver studies. The 'r factor' represents the fraction of body weight that is water (alcohol distributes through body water). Men have higher water fraction than women, so the same drinks produce lower BAC in a man. Liver eliminates alcohol at a remarkably constant ~0.015% per hour regardless of how drunk you are — there's no way to speed it up (coffee, cold showers, food don't help). Time is the only sober-er.

Practical Examples

70 kg male, 3 standard beers (12 oz, 5%) over 2 hours: BAC ≈ 0.04% — under US driving limit but already impaired (slowed reaction time, mild euphoria).

60 kg female, 2 glasses of wine (5 oz, 12%) in 1 hour: BAC ≈ 0.06% — close to US driving limit, well above EU 0.05%.

85 kg male, 6 beers in 3 hours: BAC ≈ 0.12% — significantly impaired, well over driving limit, vision and judgment compromised.

Time to fully sober from 0.08% BAC: ~5.3 hours (no shortcuts work).

Pakistan, Saudi Arabia, UAE driving limit: 0.00% — alcohol is illegal regardless of impairment.

Frequently Asked Questions

Plus or minus 20 percent individual variability. Factors the formula can't see but that genuinely affect real BAC: food in the stomach (slows absorption), genetics (ALDH2 variants are common in East Asian populations), liver health, hydration status, and any medications you're on. Don't rely on this to decide whether you can legally or safely drive — that's not what the math is built for.

Popular Conversions

Jump to a ready-made conversion — useful for quick reference and sharing:

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Calculate daily water intake in millilitres or litres from body weight and exercise minutes, with hot-climate, pregnancy and breastfeeding adjustments.

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Premium Converters

Blood Alcohol Content (BAC) Calculator

Health

Estimate blood alcohol content from drinks consumed using the Widmark formula. Time-decay adjustment + legal threshold reference.

Health

Blood Alcohol Content (BAC) Calculator

Generated on July 8, 2026

Body weight

Sex (affects body water content)

Drinks consumed

Drink size (ml)

ABV %

Number of drinks

Hours since first drink

Body eliminates ~0.015% BAC per hour

Save / share— download or share to WhatsApp, Facebook & more

Premium Converters

BAC Estimate

0.058% BAC — Mild impairment

Generated

7/8/2026

Mild impairment

0.058 % BAC

0.58 ‰ (EU)58 mg/dL

Time to fully sober: 3.9 hrs

BAC gauge

Decay over time

Step-by-step calculation

Formula

Widmark formula: BAC% = (alcohol_g / (weight_g × r)) × 100, where r = 0.68 (male) or 0.55 (female). Subtract 0.015% per hour for elimination.

1Total alcohol: 355 ml × 5% × 0.789 g/ml × 3 drinks = 42.0 g.
2Widmark r factor: 0.68 (male).
3BAC raw = 42.0 / (70.0 × 1000 × 0.68) × 100 = 0.0883%.
4Subtract elimination: 2 hours × 0.015%/hr = 0.030%.
5Final BAC: 0.0583%.
6US driving threshold: 0.08% in most states. Pakistan, Saudi Arabia, UAE: 0.00% (alcohol illegal). Most of EU: 0.05%.

1 min readHow we build →

Quick Answer

Estimate blood alcohol content from drinks consumed using the Widmark formula. Time-decay adjustment + legal threshold reference.

How the Blood Alcohol Content (BAC) Calculator works

Health

Formula

Widmark: BAC% = (alcohol_g / (weight_g × r)) × 100. r = 0.68 (male), 0.55 (female). Subtract 0.015% per hour for liver elimination.

By Muhammad Salman SaleemMethodologyNo sign-up, no tracking · Calculated on your device, not our servers

Before you start — a few notes

Pro tips most people learn the hard way

Time is the only thing that lowers BAC. Coffee makes you a more alert drunk person, not a sober one. Food slows absorption if eaten before drinking, but doesn't speed elimination once alcohol is in your bloodstream. Your liver processes about 0.015 percent per hour — that's it, no shortcuts, no magic juice, no cold shower.
Individual variability is plus or minus 20 percent. Factors the formula can't see: food in stomach, genetics (ALDH2 variants are very common in East Asian populations and dramatically affect alcohol metabolism), liver health, hydration, medications. Don't rely on a calculator to decide whether you can drive — that's not what the math is built for.
Pakistan, Saudi Arabia, UAE, and most Gulf states have zero-tolerance driving limits because alcohol itself is illegal. Any BAC above zero is a legal problem, regardless of perceived impairment. If you've been drinking and you're in any of these jurisdictions, taking transport home isn't a precaution — it's the only legal option.
Women hit higher BAC than men of the same weight after the same drinks — typically about 25 percent higher. The reason is biological: lower body water content (around 55 percent vs 68 percent in men) and lower stomach alcohol dehydrogenase enzyme activity. Same drink, more in the bloodstream.
Impairment starts well before the legal limit. Reaction time, judgment, and visual tracking are measurably compromised at 0.04 percent BAC — half the US driving threshold. 'I feel fine' is the worst possible self-assessment because alcohol impairs the very judgment you'd use to assess yourself. If in doubt, don't drive. Take the Careem.

?What is the Blood Alcohol Content (BAC) Calculator?

The Formula

Widmark: BAC% = (alcohol_g / (weight_g × r)) × 100. r = 0.68 (male), 0.55 (female). Subtract 0.015% per hour for liver elimination.

Practical Examples

70 kg male, 3 standard beers (12 oz, 5%) over 2 hours: BAC ≈ 0.04% — under US driving limit but already impaired (slowed reaction time, mild euphoria).

60 kg female, 2 glasses of wine (5 oz, 12%) in 1 hour: BAC ≈ 0.06% — close to US driving limit, well above EU 0.05%.

85 kg male, 6 beers in 3 hours: BAC ≈ 0.12% — significantly impaired, well over driving limit, vision and judgment compromised.

Time to fully sober from 0.08% BAC: ~5.3 hours (no shortcuts work).

Pakistan, Saudi Arabia, UAE driving limit: 0.00% — alcohol is illegal regardless of impairment.

Frequently Asked Questions

Popular Conversions

Jump to a ready-made conversion — useful for quick reference and sharing:

Browse all Health

BMI Calculator

Calculate Body Mass Index against WHO and Asian-population thresholds for men and women using kg or lb, cm or inches, with healthy-range guidance.

BMR Calculator

Estimate Basal Metabolic Rate using the Mifflin-St Jeor equation by sex, age, weight and height — the resting kcal/day baseline for diet planning.

TDEE Calculator

Compute Total Daily Energy Expenditure from BMR and activity multiplier (sedentary to extra active) to set kcal targets for cutting, maintenance, or bulking.

Ideal Weight Calculator

Find your ideal weight range in kg and lb using the Robinson, Miller, Devine and Hamwi formulas alongside the BMI 18.5-24.9 healthy band for men and women.

Water Intake Calculator

Calculate daily water intake in millilitres or litres from body weight and exercise minutes, with hot-climate, pregnancy and breastfeeding adjustments.

Body Fat Calculator

Estimate body fat percentage with the US Navy tape-measure method using neck, waist and hip in cm or inches — a no-cost alternative to DEXA scans for men and women.

Macro Calculator

Calculate your daily protein, carbohydrate, and fat targets based on your goals.

Pregnancy Due Date Calculator

Estimate baby's due date using Naegele's rule (LMP + 280 days), adjusted for cycle length, with conception date, trimester boundaries and current week and day.

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See every tool in this category, plus FAQs and category-specific guides.

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Blood Alcohol Content (BAC) Calculator | Premium Converters

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Premium Converters

Blood Alcohol Content (BAC) Calculator

Blood Alcohol Content (BAC) Calculator

BAC Estimate

Step-by-step calculation

How the Blood Alcohol Content (BAC) Calculator works

Before you start — a few notes

Pro tips most people learn the hard way

?What is the Blood Alcohol Content (BAC) Calculator?

The Formula

Practical Examples

Frequently Asked Questions

Popular Conversions

Embed this calculator on your site

Browse other categories

Premium Converters

Blood Alcohol Content (BAC) Calculator

Blood Alcohol Content (BAC) Calculator

BAC Estimate

Step-by-step calculation

How the Blood Alcohol Content (BAC) Calculator works

Before you start — a few notes

Pro tips most people learn the hard way

?What is the Blood Alcohol Content (BAC) Calculator?

The Formula

Practical Examples

Frequently Asked Questions

Popular Conversions

Embed this calculator on your site

Browse other categories

Premium Converters

Premium Converters

Blood Alcohol Content (BAC) Calculator

Blood Alcohol Content (BAC) Calculator

Step-by-step calculation

How the Blood Alcohol Content (BAC) Calculator works

Before you start — a few notes

Pro tips most people learn the hard way

?What is the Blood Alcohol Content (BAC) Calculator?

The Formula

Practical Examples

Frequently Asked Questions

How accurate is this estimate?

What's the driving limit?

Does coffee, food, water sober you up faster?

Why are women affected more?

Is BAC the same as breathalyzer reading?

Popular Conversions

Embed this calculator on your site

More Health Tools

Browse other categories

Premium Converters

Blood Alcohol Content (BAC) Calculator

Blood Alcohol Content (BAC) Calculator

Step-by-step calculation

How the Blood Alcohol Content (BAC) Calculator works

Before you start — a few notes

Pro tips most people learn the hard way

?What is the Blood Alcohol Content (BAC) Calculator?

The Formula

Practical Examples

Frequently Asked Questions

How accurate is this estimate?

What's the driving limit?

Does coffee, food, water sober you up faster?

Why are women affected more?

Is BAC the same as breathalyzer reading?

Popular Conversions

Embed this calculator on your site

More Health Tools

Browse other categories