What Proof is 21 Percent Alcohol?
                                
                                
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                                    4 min read                                
                            
                                In the United States, proof is exactly double the Alcohol By Volume (ABV) percentage. Therefore, any beverage that is 21 percent alcohol by volume is 42 proof. This simple calculation can help consumers understand the potency of their drinks, especially when comparing different types of spirits and liqueurs.