In our last post, we explained the difference between liters and liters of pure alcohol and how to calculate the price in each unit, a quite simple matter, as our readers have seen. At present article, we bring a slightly more complex issue that can be a greater headache: the conversion between prices in Liters of Absolute Alcohol and Proof Gallons.
The alcoholic graduation refers to the volume of alcohol in a volume of product equivalent to 100, measured at 20 ° C, for example 40 ° or alc. 40% vol (volume of alcohol) means that there are 400 ml of ethanol in a liter. In Latin America, this measure is expressed as ºGL, but, beyond the denomination, both measures are identical.
Meanwhile, the Anglo-Saxon culture measures the volume of alcohol per proof. Our readers from the United States or those accustomed to work in this country, will probably be familiar with this unit. The conversion between alcoholic grade and proof is quite simple: proof equates to double of alcoholic grade, since the volume of alcohol per proof is measured from 0 to 200 instead of being measured from 0 to 100; So, 80 proof equals 40% vol. Nevertheless, In the United Kingdom, they use a somewhat more complex system since they measure the volume of alcohol from 0 to 175 (our 40% vol would be 70 UK proof) fortunately, this quota is practically replaced by the European one, reason why it is not worth devoting more Attention.
If you are familiar with the US market for spirits and alcoholic beverages, another unit you will probably be familiar with are gallons, which are used instead of liters. 1 Gallon equals to 3.78541 liters. This conversion is also simple (google does it for us). So far everything is quite simple, the difficulty usually appears when we have a price in Liters of Absolute Alcohol and we want to know how much would be in Proof Gallons or vice versa.
Therefore, taking a 5 EUR / LAA price as example; First, we will convert the price to price per liter (5×40 / 100 = 2). Then, we will multiply by 3.778541 to obtain the price for Gallon which is 7.57082 EUR. We multiply this price by the alcoholic level (40) and we get 302.8328, which divided between 100 gives us a price of 3.028328 EUR per volume Absolute Alcohol, and, as proof is double, we multiply by 2 and get a Proof Gallon price of 6.056656 EUR rounding 6.06 EUR. Now we just need to convert into dollars (6.50 USD at time of publication).
If we want to do the operation upside down, we only have to “undo” the steps. For example, if we have a price of USD 6 Proof Gallons, being proof 80, we divide it between 80 and we get 0.075 that multiplied by 100 gives us a price of 7.5 USD for Gallon, we divide this price between 3.78541 which is 1.98 USD Per liter and therefore, 4.95 USD per liter of absolute alcohol (1.98 / 40×100 = 4.95). If we want to know the price in euros, once again, we only have to convert (4.61 EUR at the date of publication).
*TRICK: There is another easier way of changing from pure liter of alcohol to proof gallon. You just have to divide the volume in pure liter by 1.8927. For example, we have 7,000 LPA and we want to change it to PG, we divide 7,000 LPA / 1.8927 = 3,698.42025 PG. If it was proof gallon to pure liter, you just have to multiply the PG volume by 1.8927.