A standard glass of wine is 5oz at 12% ABV, containing approximately 14 grams of pure alcohol. However, restaurant pours are routinely 7–9oz — meaning a single 'glass' often contains 1.5–2 standard drinks. This consistent underestimation makes wine one of the most commonly miscalculated alcohol sources.
Red wine causes notably worse hangovers than white wine due to higher congener, tannin, and histamine content. Sulfites, often blamed for wine headaches, primarily cause respiratory symptoms in sensitive individuals rather than headaches. The actual headache triggers are tyramine and histamine.
Sparkling wines (champagne, prosecco, cava) are absorbed faster than still wines due to carbonation, producing a quicker BAC rise and earlier peak effects. This is why champagne feels 'more intoxicating' than still wine at equivalent alcohol levels.
Wine ABV varies significantly: Moscato (5–7%), Pinot Grigio (11–13%), Chardonnay (13–14.5%), Cabernet Sauvignon (13.5–15%), and some Zinfandels exceeding 16%. A glass of high-ABV red contains significantly more alcohol than a glass of light white.
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A personal trainer uses the calculator with a new client to set a measurable starting point. Re-running the calculation at 4-week intervals provides an objective progress metric that supports motivation and programme adjustments.
Wine BAC Estimation
BAC ≈ (Glasses × oz/5 × ABV/12 × 0.06) / (Weight kg × 0.7) − (0.015 × Hours)
Adjusts for actual pour size (vs standard 5oz) and ABV (vs standard 12%). Restaurant pours often double the expected alcohol per 'glass'.
A 65kg person drinks 3 large glasses (8oz each) of 14% Cabernet over dinner.
Result: Three 'glasses' of restaurant wine can equal 5.6 standard drinks — well above what most people estimate. Full BAC clearance: 5 hours. EtG detection: 2–3 days.
Per serving volume, yes. But restaurant wine pours (7–9oz) at 14% ABV often equal 1.5–2 shots of spirits. Total alcohol consumed is what matters, not the type.
Yes. Red wine contains more congeners, tannins, and histamine. Studies show red wine produces significantly worse hangover symptoms than white wine at equivalent alcohol levels.
Traditional tests: 12–48 hours. EtG tests: 48–80 hours. Heavy wine consumption can extend EtG detection to 5 days.
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