Litres / Gallons conversion

Question

Litres / Gallons conversion

Doug

2013年12月10日 20:11

Hope this doesn't sound like too daft a question... but I'm English and a noob so please humour me :)

When I am reading recipes, brewing instructions, calculations, etc. from American documentation and they are referring to "gallons" are these imperial gallons or US gallons?

To me, 1 gallon = 4.5 litres. Google tells me that 1 US gallon = 3.8 litres. Quite a difference. Clearly, since we both split gallons into the same number of quarts and pints, this would affect the measurement of those too.

Although this affects pretty much everything I need to learn, I am asking specifically because of point 14 at the bottom of Palmer's page here http://www.howtobrew.com/section3/chapter18-6.html - using US gallons in this calculation gives my first every AG brew an extraction efficiency factor of 30 (yay!) whereas using imperial gallons gives me 25 (boo!).

Topic first-time-brewer conversion homebrew efficiency

Category Mac

Chino Brews · Accepted Answer · 2013年12月10日 00:14

Palmer is referring to U.S. customary measurements.

One U.S. gallon is 3.79 liters.

One liter is 0.26 U.S. gallons, or 1.05 U.S. quarts.

For the U.S. customary measurement system-impaired (i.e., the whole world except the U.S and maybe parts of the U.K.), a U.S. quart is slightly smaller than a liter, and there are two 8-ounce cups in a pint, two 16-ounce pints in a quart, and four 32-ounce quarts in a U.S. gallon. Thus, a gallon is 128 ounces.

Because many U.S. recipes call for five-gallon batches, you should know that 19 liters = five U.S. gallons.

When using extraction efficiency formulas, remember that one point per pound per gallon (ppg) = 8.3454 points per kg per liter (pkl).

Edit: clarified that we use U.S. measures in th U.S., even though we sometimes erroneously refer to them as "Imperial" or "english" measures. Imperial measures are often very different than U.S. measures.

Litres / Gallons conversion

About