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# Converting units: US volume

Learn how to convert US Customary units of volume (gallons, quarts, pints, and cups). We see the conversion process using an example of converting 3 and 1/2 gallons into cups, emphasizing the relationships between the units. Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

• Why does there have to be the U.S customary units? Why can't we all just use the metric? It's a lot easier!
• Probably because US units is important because they are used a lot in the US, and people need to know how to use them effectively, but I agree with you fully
• How do you remember like how many oz go into a lb and all that stuff?
• 16 oz in a lb
8 oz in a cup
2 cups in a pint
4 cups in a quart
16 cups in a gallon
2 pints in a quart
8 pints in a gallon
4 quarts in a gallon
• upvote this if ur hungry for mcdees....
• Any easy way to remember this? A saying or something?
• yes, KHDDCM=King Henry Died Drinking Chocolate Milk. That's how I learned it.
• why does lb stand for pounds??
• The form lb is actually an abbreviation of the Latin word libra, which could mean a pound, itself a shortened form of the full expression, libra pondo, “pound weight”. The second word of this phrase, by the way, is the origin of the English pound.
• the video is very confusing, how am i supposed to remember what he did before the last problems
• 1 ounce per gallon, how much of the ounce for 1 cup?
• There are 8 fluid oz in a cup.
• Could you also have made the 3 1/2 into 3.5 gallons and multiplied it by 16? It comes out as the same answer.
• Yes that method is correct, because there are 16 cups in a gallon (4 cups in a quart, and 4 quarts in a gallon).