Estimate blood alcohol content based on drinks, weight, gender, and time elapsed.
This tool applies a standard formula to convert your drinks, body weight, gender, and time elapsed into an estimated blood alcohol concentration (BAC). It is a calculator, not a sobriety test, and its result is an approximation based on average metabolism rates. The most common surprise is that time does not reduce BAC as fast as people expect; the body eliminates alcohol at a roughly fixed rate, so drinking shots quickly can produce a surprisingly high estimate.
The tool asks for your weight in pounds or kilograms, your sex assigned at birth, the number of standard drinks consumed, and the hours since your first drink. It computes BAC using the Widmark formula, which includes a unit conversion factor (5.14), body weight in pounds, a gender-specific distribution ratio (0.68 for men, 0.55 for women), and a time-based elimination term. The result is a blood alcohol concentration expressed as a percentage.
The calculator subtracts a fixed elimination rate of approximately 0.015% BAC per hour from the peak estimate. This rate is an average; your actual metabolism can be faster or slower. The tool does not account for food intake, medications, or health conditions, so real BAC can differ substantially from the displayed value.
No. The calculated value is an estimate based on averages and should not be used to make driving decisions. For most people, the only safe choice after drinking is to not drive. Legal limits vary by jurisdiction and enforcement relies on actual breath or blood testing, not a formula.
No. Coffee and food do not speed up alcohol elimination. Food eaten before drinking slows absorption but does not change the removal rate. The only way to lower your BAC is time; the body eliminates alcohol at a roughly constant rate regardless of what you eat or drink afterward.
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