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BAC calculator

Compare a theoretical peak BAC range from beverage volume, alcohol strength and adult body weight.

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Compare a theoretical peak BAC range from beverage volume, alcohol strength and adult body weight.

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Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
Saved scenario
Save the current answer, then change an input to compare. This clears when you leave.
Formula and assumptions
This model assumes all alcohol is absorbed and none has been eliminated. It is not your current BAC, a measured result or a confidence interval. Do not use it to decide whether to drive or when you will be sober. The range uses distribution volumes of 0.40–0.80 L/kg. Food, timing and individual physiology are not modeled. For mixed drinks, run each ingredient separately and add its alcohol mass, or use a volume-weighted ABV.
Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.
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Using BAC calculator
Compare a theoretical peak BAC range from beverage volume, alcohol strength and adult body weight.
This model assumes all alcohol is absorbed and none has been eliminated. It is not your current BAC, a measured result or a confidence interval. Do not use it to decide whether to drive or when you will be sober. The range uses distribution volumes of 0.40–0.80 L/kg. Food, timing and individual physiology are not modeled. For mixed drinks, run each ingredient separately and add its alcohol mass, or use a volume-weighted ABV.
Next: Beverage ABV calculator
Next: Unit converter
A worked example
1,000 mL at 5% ABV contains 50 mL of ethanol, or 39.45 g. At 80 kg, the two distribution assumptions give 0.062% and 0.123%.
Before you use the result
This model assumes all alcohol is absorbed and none has been eliminated. It is not your current BAC, a measured result or a confidence interval. Do not use it to decide whether to drive or when you will be sober. The range uses distribution volumes of 0.40–0.80 L/kg. Food, timing and individual physiology are not modeled. For mixed drinks, run each ingredient separately and add its alcohol mass, or use a volume-weighted ABV.
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ToolOctopus. “BAC calculator.” Updated 2026-09-29. https://tooloctopus.com/bac-calculator.
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