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# Converting US customary units of volume

Sal converts between gallons, quarts, pints, cups, and fluid ounces. Created by Sal Khan.

Video transcript

So right here we've listed two
quantities or two fluid volumes right over here in terms
of gallons, 1 gallon and 2 gallons. And what I want to
do in this video is try to convert this quantity
of fluid, this volume of fluid, I want to convert it into
these other units within the US customary system. So I encourage you
to pause the video and first try to
do the 1 gallon. Try to convert it into quarts,
pints, cups, and fluid ounces. Well, 1 gallon is
equal to 4 quarts. So we can just multiply by 4. 1 quart is equal to 2 pints,
so we can multiply this by 2. So 4 quarts, each
of them are 2 pints. 4 times 2 gets us to 8 pints. Each pint is equal to 2
cups, so we have 8 pints. Each of them are
equal to 2 cups. We're going to have 16 cups. And then finally, if we're
converting from a cup to a fluid ounce, each
cup is 8 fluid ounces. So if we have 16 cups, it's
going to be 16 times 8. 8 times 8 is 64, and it's
going to be twice that. That's going to be
128 fluid ounces. Now, let's do the same
thing with 2 gallons. Try to convert that into quarts,
pints, cups, and fluid ounces. And I encourage you
to pause the video and try it on your own first. Well, same idea. 1 gallon is equivalent
to 4 quarts. So 2 gallons are going to be
2 times 4 quarts, or 8 quarts. quart is 2 pints. So if we want to go
from quarts to pints, we'd want to multiply by 2. So this is going to be 16 pints. And then each pint is 2 cups. So multiplying 16 of them, then
that's going to be 32 cups. And then finally,
each cup is 8 ounces. 32 times 8 is going to be? Let's see, it's going to be 256. And notice something here. When we went from 1
gallon to 2 gallons, we essentially increased the
quantity of gallons by 2, or we multiplied by 2. And you see that
across the board here as it's going from
4 quarts to 8 quarts. This is going from
8 pints to 16 pints. This is going from
16 cups to 32 cups, going from 128
fluid ounces to 256. When you increase the volume
in gallons by a factor of 2, you're, of course, going
to increase the volume in any unit you measure
it in by a factor of 2.