What does this health or nutrition number mean?

A standard 330ml beer (13g alcohol) in a 70 kg person produces ~0.25 g/L BAC. At the elimination rate of 0.15 g/L per hour, your body clears it in roughly **1.7 hours**. A 500ml pint takes about 2.7 hours for the same person.

Your liver eliminates alcohol at a constant rate of approximately **0.15 g/L per hour** (range: 0.10–0.20 g/L/h). After 4 standard drinks, most people take **6–8 hours** to reach zero BAC. Only time works — coffee, water, and exercise do not speed the process.

One US standard drink contains **14 grams of pure alcohol**, equivalent to: 355ml beer (5% ABV), 150ml wine (12% ABV), or 45ml distilled spirits (40% ABV). Our calculator uses similar volumes with accurate ABV-based gram calculations.

Yes, it's possible. One beer can produce a BAC of 0.02–0.04% (0.2–0.4 g/L), which is detectable by a breathalyzer. Though it's below the 0.08% legal limit in the US, you could still be charged with DUI if your driving is impaired.

Women have a lower Widmark factor (r = 0.55 vs. 0.68 for men), reflecting lower body water content, less of the stomach enzyme alcohol dehydrogenase (ADH), and typically higher body fat percentage. At the same weight and consumption, women's BAC is typically **20–30% higher** than men's.

Yes, food eaten before or during drinking slows alcohol absorption from the stomach into the bloodstream, **delaying and lowering the peak BAC**. However, it doesn't reduce the total amount of alcohol processed — the final number of hours to reach zero remains similar.

For a 70 kg male: roughly 2 standard drinks (28g alcohol) produces ~0.59 g/L (0.059%), which is under the 0.08% limit. But impairment starts at very low BAC levels. The safest answer is **zero drinks** if you plan to drive — individual metabolism varies widely.

The Widmark formula has an estimated margin of **±20%** because actual BAC depends on metabolism, genetics, food consumed, hydration, medications, and alcohol tolerance. **Never use this calculator to decide whether to drive.** If you've been drinking, don't drive.

They are equivalent measurements. **0.8 g/L = 0.08% BAC** (the US legal limit). To convert: divide g/L by 10 to get %. The US and UK typically express BAC as a percentage; other countries use g/L or g/dL.

Call Uber, Lyft, or a local taxi. Designate a sober driver before you start drinking. Many areas have drunk-driving prevention hotlines that offer free rides. A rideshare costs far less than a DUI fine, license suspension, or the risk of harming yourself or others.

When performed by a trained technician, the Jackson-Pollock 3-Site method has a standard error of estimate (SEE) of approximately **±3–4% body fat** versus DEXA (considered a gold standard). Jackson & Pollock's original 1978 study (Medicine & Science in Sports) reported an SEE of 3.4% for men and 3.9% for women. DEXA itself carries an SEE of ~1–2%, but costs $50–$200 per scan. For tracking relative changes over time (rather than absolute values), skinfolds are a practical and widely validated alternative.

Research-validated protocols use **Harpenden** or **Lange** calipers, which apply a standardized jaw pressure of **10 g/mm²** across the full measurement range. Consumer-grade plastic calipers (e.g., Accu-Measure) are less consistent and typically have test-retest errors of ±3–5%, compared to ±1% for professional calipers. For gym or home use, plastic calipers are acceptable for rough tracking, but clinical or research assessments require calibrated metal calipers.

**Men — Chest:** diagonal fold halfway between the anterior axillary line and the nipple. **Men — Abdomen:** vertical fold 2 cm to the right of the navel. **Both sexes — Thigh:** vertical fold on the anterior midline of the thigh, halfway between the inguinal crease and the proximal border of the patella. **Women — Triceps:** vertical fold on the posterior midline of the upper arm, halfway between the acromion and olecranon. **Women — Suprailiac:** diagonal fold just above the iliac crest at the anterior axillary line.

The Jackson-Pollock equations were validated on adults **aged 18–61**. Applying them outside this range increases prediction error because body fat distribution and density of lean tissue change significantly with aging (lean mass density decreases after ~60) and in adolescents (whose bodies are still developing). For older adults, the **Durnin-Womersley 4-site method** or **DEXA** is generally preferred. For children and teens, CDC growth charts and pediatric-specific skinfold equations (e.g., Slaughter et al., 1988) are recommended.