Ratios, proportions, units, and rates

# Unit conversion

## Unit conversion: gallons to quarts, pints, and cups

What's the difference between gallons, quarts, pints, and cups? Soooo many people go their entire lives without knowing how to convert one unit of measure to another. Take note.
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## Unit conversion: gallons to quarts, pints, and cups

Discussion and questions for this video
how do you convert let's say for an example gallons to pints or pints to quarts?
1 gallon= 4 quarts
1 quart= 2 pints
so, 4*2=8
1 gallon is the same as 8 pints
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how come there is not just a video on only customary units? i get confused with metric=D
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Metric uses entirely powers of 10, it is much much much easier then the units we use (known as Imperial Units). Metric is confusing right now because you haven't had nearly as much practice with it then you have with the Imperial system. You've been using the imperial system since what, first grade? Second grade? How long have you been using metric? If you work with metric enough you'll begin to wonder why we stick with such a crazy system in the US.
how many cups in one gallon ??
There are 16 cups in a gallon.
how do you convert oz to pounds
Their are 16 ounces in a pounds.

16 Ounces=1 Pound
1 Ounce= 1/16 Pounds
Is there something larger than a gallon?
acre-inch = 27,154.3 gallons (US, liquid)
acre-foot = 325,851.4 gal.
barrel (US, liquid) = 31.5 gal.
drum (US, petroleum) = 55 gal.
hogshead (I'm not kidding) = 63 gal.
pipe = 126 gal.
What is an easier way to remember how to convert between measurements?
You should be able to remember by the kingdom of G. Draw a big G (for gallons) inside draw four Q( for quarts) inside of the Q draw two P(for pints) and inside of that draw 2 C (for cups). The story goes something like this, there once was a kingdom G that had 4 queens. Each queen had two princesses. Each princess had two cats . The end.
How in the world am I supposed to remember/memorize all this?
A tip anybody?
And a tip for Anam is that just make up little tricks and if you want, you can draw gallon man. Search it up.
What type of gallon is he using... US or 'British?'
He is using the US version.
Read this it will explain the difference.
http://en.wikipedia.org/wiki/Gallon
This is not a question but I know an easier way with something called gallon man. It is a gallon with 4 quartz coming out and 2 pints coming out of each quart and 4 cups coming out of each pair of pints. This is showing how some things equal others. I wish I could show a picture.
uuuhhhh i actually have never seen that way of doing that before. Thats a nice way to solve a problem!
Any recommended website with good metric conversions?
Google has a built in unit converter. Simply type a query such as "5 quarts to liters", and Google will respond with the conversion. Neat!
What is a percentage ?
A percentage is a value / 100. Per cent means per 100.
A gallon is the greatest unit of measurement for liquid, right?
i'm sorry boys and girls but the biggest unit of measurement for volume is the cubic yottameter.
I Think everything is correct
is that a question or?
What is a cent, then?
A cent in mathematical terms means 100. In other terms a cent can also mean 1/100 of a dollar = 1 cent or 1 penny
What's 9+10 every one says its 21 but the calculator says its 19 IM SO CONFUSED
9+10 is in fact 19, because 10 + 5 + 4 = 15 + 4 = 19. Everybody says it's 21 because it's a stupid internet thing, don't listen to them.
Why do you cut the quarts?
i know this may be a dumb question but what does wps mean?
Not a dumb question -- its a good question! It's a matter of reading someone else's handwriting. Watch the video at 5:01, and you'll see that Sal is actually writing "cups," not "wps."
how many quarts in a gallon
There are 4 quarts in a gallon.
And..
2 pints in a quart,
2 cups in a pint,
thus, 16 cups/8 pints in a gallon.
I like the way he made a picture for all the people who learn visually.
This is a Tips and Thanks.
on 5:07 how did he get 56 cups?
can you divide?
Yes, of course.
what if the pints are not the shown in the question
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How can you find the unit conversion for cups to pints and quarts to gallons? And would people quit being rude to other people?
Well, a cup is 1/2 of a pint or 2 cups is equal to a pint. As for quarts to gallons, I remember that quarts are a quarter of a gallon or 4 quarts in 1 gallon! Hope this helped!
Is this video using the U.S customary system?
Yes its customary because metric system uses liters and stuff
How many teaspoon are in 2 oz of liquid?
12 teaspoons... I just googled it:)
How can you convert gallons to pounds?
You can't. Gallons is a way to measure volume, and pounds is a way to measure weight. The reason why you can convert gallons to quarts, pints, or cups is because gallons, quarts, pints, and cups all measure volume. If you had a gallon of something (like water), you could use the volume of the water to find the weight of the water. But you can't convert gallons into pounds without something else in the equation, and it'll be different depending on what that "something else" is. You will learn more about this in the chemistry and physics playlists.
How do u convert cups into fluid onces?
Every cup is 8 fluid ounces.
How many cups are in a liter?
there are 4.226 cups in a liter.
Why is gallons in the numerator? Can you set this up as a ratio with an equal sign? Putting the gallon in the denominator and the unknown cup in the numerator? Or is that what is happening and your just not showing it?
Yes, when you set up proportions, you can choose to write the ratios with either unit in the numerator or denominator AS LONG AS you are consistent in both ratios. Like, if you choose to put gallons on top and cups on the bottom, you must put gallons on top and cups on the bottom for BOTH ratios in the proportion.
I'm just doing this section so that I can complete ratios, proportions, units, and rates. I'll never use Imperial because it's not used here.

If I went to the USA would I really have to know this old stuff for a real work place? When I work over in the UK older people in general conversation sometimes refer to the old Imperial system they used back in the 1970's, (which I think is different to the USA Imperial), but it would never be used in a formal setting like at work on a building site or in engineering or shops or anywhere come to think of it except I think their road distances might still be in UK miles in most places, though I have seen normal Km in a few places there too.

Metric is so much easier and universal, and I've never heard anyone except a North American use Fahrenheit for temp. I don't understand that temp scale at all. I've only ever used Kelvin and Celsius. I find this cultural difference social stuff interesting. Is it just social habit to use these old systems or is it because it's too economically expensive for the USA to play catch up and change everything?
There is a really great book on the subject called: The Measure Of All Things. It chronicles the making of the meter and the metric system. It's like an adventure story about two men setting out in opposite directions through war torn France to measure a section of the earth's meridian. It takes them years to finish their task while being imprisoned, wounded, sick, stuck in foreign country. It's a fun read and would answer your questions.
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i never remember how many yards are in one mile! help!!
There are 1760.
sal should covert the unit more clearly
if u would've listened more carefully uwould not be asking this question
Why didn't you turn 7/2 into a decimal, 3.5?
Converting to decimal would have added several more steps. It's much easier to leave it as a fraction. Besides, if it had been 7/3 instead of 7/2, what would you do then? Converting to decimal would require an inconvenient repeating digit. Better to get used to doing things the right way and leaving intermediate fractions as-is.
The opening screen of the video provides this comment, "What's the difference between gallons, quarts, pints, and cups? Soooo many people go their entire lives without knowing how to convert one unit of measure to another. Take note. "

Khan Academy admirably promotes the idea of holistic learning, meaning that math and science problems regularly teach other lessons outside of math and science. Standard English grammar should be as precise as math and science. Therefore, a Khan Academy editor should revise "What's the difference between gallons, quarts, pints, and cups?" to "What's the difference AMONG gallons, quarts, pints, and cups?" Between signals comparison of TWO items, while AMONG denotes comparison of more than (>2) items.
Very observant! However, you should probably put this tip under Tips and Thanks for Sal and the Khan Team to review, otherwise you could get a flag or negative votes.
Interestingly enough, though, Sal prefers to not edit his videos to create the effect that a teacher is giving a lesson on the screen. Although it creates the occasional grammar slip, in the end, it's probably working, because I know at least I have learned a lot.
However, as a fellow believer in good grammar, I genuinely think you should put this under Tips and Thanks, because you raise a fair point.

Hope it helped!
how many cups are in 3/4 gallon
A gallon is equal to 16 cups. 3/4 is equal to 12/16, so there are 12 cups in 3/4 of a gallon. Hope this helps!
Is there something smaller than a cup?
yes, there is another measurement called an ounce. there are 8 ounces in one cup.
Is there something smaller than an ounce?
In the standard system, there is nothing smaller than an ounce. However, in the metric system, milliliters are smaller than ounces.
Is it more efficient to use this system or metrics?
Is there anyway to make remembering this easier?
110 mi/h = mi/day
As a person who lives in Australia. I have never seen a gallon of milk.
1 Vote
One US gallon is about 3.75 liters.
How do you convert gallons to liters?
There are 3.78541 liters in one gallon.
Might be helpful for some of you.
The video is great.
the video is amazing
Why do like to change it into a improper fraction? I think proper fractions are easy to use better then improper fraction. It would make more sense to just use proper fractions.Thanks though!
because with improper fractions, it is just one set of numbers. Looking at it is harder than doing it....
how many cups = 16 fluid ounces
There are 8 cups to a fluid ounce. Another way of writing this could be 8(fluid ounces) = 1(cup). Since you want to know the conversion of 16 times this amount, multiply both sides by 16 and you get 2(cups) = 16(fluid ounces).

EDIT: This is wrong, the answer is 2 cups, I just looked at this and it didn't make much sense to me. There are 8 fluid ounces to a cup so you multiply both sides by 2 and you get 16(fluid ounces) = 2 cups
Why did Sal write wps instead of cups?
how many gallons and qt in 38 pints
well each quart is 2 pints so there are 38/2 qts in pints which is 19 qts.
and then there are 8 pints in a gallon so 38/4=9.5 gallons in 38 pints.
please vote up if this helped!
38 Pints = how many gallons and qts
4 gallons, and 3 quarts.
why is it hard to understand
2 pints and one quart how many cups are in 3 1/21 gallons?
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1 Comment
How were you supposed to know how many cups there are in a pint, how many pints there are in a quart, and how many quarts there are in a gallon.
Why doesn't talk about metric stuff like liters and meters?
He has that in the U.S. Customary and Metric Units video.
Like I said to someone else, if you are still wanting to see a video on that here is the link;
Ask a question...I need help with the multi and divi part
Can you divide gallons into pints?
Yes:
1 gallon = 4 quarts = 8 pints
I have a question when converting do you use larger 2 smaller?
Thanks for that video now i know what to do for the last test of the year. Once again thanks and i have confident 4 my last test of the year.
could you multiply the 2 cups/pints by 2 pints/quart then by 4 quarts/gallon?
You could, if you like!
I don\t understand why Sal does this:
8 pint / 1 galon * 2 cups / 1 pint

Why not multiply the pints with the pints? I mean I learned the process: if fraction 1 has pint at numerator,fraction 2 should have it at denominator,but I just don't understand why.
Some people call it "dimensional analysis". I have no idea why but it would look like this:

8 pints 2 cups
-------- * ------
1 gallon 1 pint

If you multiplied the pints, you would get

8 pints²
---------------
2 cupic gallons

Now does that make any sense? No!

When you multiply Sal's together, you will get

8 pint(s) * 2 cups
-----------------
1 pint * 1 gallon

Notice that I switched around the gallon and the pint at the bottom to make the next step more understandable. This works perfectly due to the commutative property of multiplication.
Now remember how you can simplify

2 * 6
-----
2 * 2

By getting rid of the 2 altogether? This works because they are being multiplied, which is the opposite of division. 12 / 4 is 3, just like 6 / 2
You can actually do that to get rid of the word "pint". Literally! You can cancel the units, by getting rid of the unit from the numerator and denominator from the number they are attached to. That might not be the best explanation, but it results in this:

8 * 2 cups
------------
1 * 1 gallon

Now think about it, if you have 8 groups of 2 cups each (8 * 2 cups), you really have 16 cups! And if you have a group of a gallon each, you really have a gallon! So:

16 cups
--------
1 gallon

Which is actually the exact number of cups in a gallon! Cool huh?
The reason fraction 1 has it in the numerator and fraction 2 has it in the denominator, is that you can cancel out the word "pint".
I did catch that.
Why don't they include ounces?
What is the name of the method where you can cancel out the units diagonally.
Simplifying of maybe cross multiplying
Towards a little more than the middle of the video, he has this equation lined up. Is there a name for that method where you can just cancel out diagonally the units?
Is there a tutorial for metric staircase conversion?
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1 Comment
There a tutorial. It is in the fourth grade U.S. --->Measurement and data---> Measuring with metric and U.S. customary units: intro.
i need help remembering how many quarts a gallon, how many pints per quart and how many cups per pint. HELP :(
what is the difference between gallons and quarts
There are 4 quarts in a gallon. Quart(er)
what program do u use to make this videos? they are really good!
What type of.. I guess coloring thing are you using in your video?
At 5:56 how did Sal get 7*8 over 2?
How many oz are there in a cup, pint, quart, and gallon
There are 8 oz in a cup. 2 cups in a pint. 4 pints in a Quart and 4 quarts in a gallon.
dosen't wps mean words per second?
Are there any more fluid unit reviews in KA?
Why do you cancel out when you have 2 quarts to find pints?
how did you get the 7/2? im so confused!!
how do you convert a picture through space