This calculator calculates the Kilocalories (Kcal) or Kilojoules (KJ) of ethanol contained in a given volume and proof. This routine only calculates the energy (Kcal or KJ) from ethanol.

Because the specific gravity of ethanol is 0.8 g/mL, and alcohol content of drinks is usually represented as Proof, which is based upon the contribution of the ethanol by volume (not weight), and ethanol is 7 Kcal (29.4 KJ)/gram; some calculation is required.

It is important to note that this only addresses energy from ethanol as most drinks have substantial amounts of energy (Kcal/KJ) from items mixed in with the source of ethanol.

This routine will ask for the quantity (ounces or mL) consumed, the proof or % ethanol and whether the user would like output in Kcal or KJ.

The equivalents are:

1 ounce = 29.6 mL

1 proof = 0.5%

1 Kcal = 4.2 KJ

The formula is:

Kcal = mL consumed x fraction ethanol x 0.8 grams/mL x 7 Kcal/gram

KJ = Kcal x 4.2 KJ/Kcal

For example, 100 mL of a 75 proof liquor in Kcals would compute as:

Kcal = 100x 0.375 x 0.8 x 7 = 210 Kcal