BAC Calculator - Calculadora online grátis

Blood Alcohol Content (BAC) measures the alcohol concentration in your bloodstream - typically expressed as a percentage. It's the legal definition of intoxication for driving in nearly every country. India enforces one of the world's strictest drink-driving limits at 0.03% BAC (30 mg/100ml). For context: the US limit is 0.08%, the UK 0.08% (England/Wales) or 0.05% (Scotland), most of Europe 0.05%. India's 0.03% means effectively that any meaningful alcohol consumption puts you over the legal limit.

This calculator uses the Widmark formula - the standard pharmacological model used since the 1930s for BAC estimation. It accounts for total alcohol consumed, body weight, gender (women have lower body water percentage, leading to higher BACs from the same alcohol), and time elapsed since drinking began (alcohol is eliminated by the liver at roughly 0.015% BAC per hour). Important: this is an estimate - individual variation due to food in stomach, drinking speed, genetics, and liver function means actual BAC can vary ±30% from prediction. Never use this to decide whether you can drive.

Widmark formula: Peak BAC% = (Grams of alcohol / (Body weight × r)) × 100/1000. Where r = 0.68 for men, 0.55 for women (distribution ratio based on average body water content). The result is a percentage. Current BAC = max(0, Peak BAC − 0.015 × Hours since drinking started). One standard drink contains roughly 13-14 g of pure alcohol - equivalent to one 330 ml beer at 5% ABV, one 150 ml wine at 12% ABV, or one 45 ml spirits shot at 40% ABV.

BAC effects on the body (rough guide, individual response varies): 0.02% - slight relaxation; 0.05% - judgment impaired; 0.08% - clear motor impairment (legally drunk in most Western countries); 0.10% - significant impairment, slurred speech; 0.15% - markedly impaired, vomiting possible; 0.30% - loss of consciousness possible; 0.40%+ - life-threatening alcohol poisoning. India's 0.03% legal threshold corresponds to early-stage relaxation - meaning the law catches even subtle impairment.

Time matters as much as alcohol amount. Liver elimination of alcohol is nearly constant at ~0.015% BAC per hour, regardless of body weight or how fast you drank. Coffee, cold showers, exercise, water - none of these speed up elimination. The only cure for high BAC is time. A 70 kg man who drinks 4 standard drinks reaches BAC ~0.08% after the last drink; it takes ~5 hours to clear back to 0.00%.