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After consuming alcohol, blood alcohol concentration changes as the body absorbs and metabolizes alcohol. The timing and amount of drinks, their alcohol content, and individual biological differences can all influence BAC. A BAC calculator can provide an approximate illustration of how these factors relate to blood alcohol concentration. You can explore this topic using the BAC Level Calculator . Keep in mind that alcohol levels may continue to rise after the last drink. Estimates cannot reliably establish when alcohol has cleared your system, so avoid driving after drinking.