Whiskey Dilution Calculator finds water to add for a target ABV or proof, predicts final strength after dilution, and scales pours or bottles in mL, L, or oz.

Choose a solve target, then complete the visible required fields marked with *.

The calculation retains full precision; this changes displayed volume rounding.

Whiskey Dilution Formula

The following formula is used to calculate the Whiskey Dilution. 

WD = (W * (BP / DP - 1))

Variables:

  • WD is the Whiskey Dilution (amount of water to add (oz))
  • W is the amount of whiskey (oz) 
  • BP is the bottle proof 
  • DP is the desired proof 

How to Calculate Whiskey Dilution?

The following steps outline how to calculate the Whiskey Dilution.

  1. First, determine the amount of whiskey (oz).
  2. Next, determine the bottle proof. 
  3. Next, determine the desired proof. 
  4. Next, gather the formula from above = WD = (W * (BP / DP – 1)).
  5. Finally, calculate the Whiskey Dilution.
  6. After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

amount of whiskey (oz) = 30

bottle proof = 80

desired proof = 40

WD = (W * (BP / DP – 1)) =  ?