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# How many gallons per cubic foot? Or... how many gallons in 9 cubic feet?

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• Anonymous Mar 13, 2014

3' pipe that is 350' long has how much cubic feet of space

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Google is very good at this, if you type "us gallons to cubic feet" it will work it out for you.

So 1 US gallon = .13368 cubic feet

or 9 cubic feet = 67.32 US gallons

Posted on Mar 24, 2011

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Posted on Jan 02, 2017

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## Related Questions:

### Can you help me i need a pump that will produce 1 GPM thru 250' x 1/2" tubing @ 10psi

You can convert pipe size to gallons per minute of flow by calculating the cross-sectional area of the pipe and making some reasonable assumptions about pipe volume and the rate of flow. Pipe sizing is measured by the internal diameter of the pipe, not the overall outside diameter. Once determined, the overall volume can be calculated. Pipe flow is described in gallons per minute. Shorter lengths of pipe will have a greater flow than a longer length of the same diameter. This is caused by internal resistance of the pipe itself. By the same reasoning a larger diameter pipe will have a greater flow or GPM than a smaller pipe at the same pressure or flow rate. Pressure is described as pounds per square inch. The square-inch measurement is determined by the area of the pipe. The pounds are the amount of force that is placed on the liquid to push it through the enclosed space.With that background, you can estimate the flow based on the pipe size.
Find the cross-section area of the pipe. Area is equal to pi times the radius squared or a = 3.14 x r2. A two-inch diameter pipe would have a cross-section area of 3.14 x 12 or 3.14 square inches.
Understand that water has a certain pressure associated with the height of that water. One pound of water pressure, or 1 PSI, is equal to 2.31 feet of elevation in height. In other words, a 1-inch column or pipe of water that is 2.31 feet high will have a pressure of 1 PSI. The overall height -- not volume -- of the pipe corresponds to the pressure. A 6-inch diameter pipe that is 2.31 feet high will only have 1 PSI.
Find the volume of the 2-inch diameter pipe in Step 1 that has a length of 10 feet. Ten feet is equal to 120 inches. Multiply 3.14 square inches, the cross sectional area, times the length. The volume of the pipe is equal to 376.8 cubic inches of volume.
Convert cubic inches into cubic feet. One cubic foot equals 1,728 cubic inches. Divide 376.8 cubic inches by 1,728 cubic inches per cubic foot and the answer is .218 cubic feet. This means that the 2-inch diameter pipe that is 10 feet long has an internal volume of .218 cubic feet.
Calculate the amount of water that can be contained in the section of pipe at any given time. One cubic foot of water is equal to 7.48 gallons. Multiply 7.48 gallons by .218 cubic feet and the amount of water in the pipe is equal to 1.63 gallons.
Find the GPM if the flow of water is one foot per second. Multiply the one-foot per second flow by 60 seconds per minute and the flow is now 60 feet per minute. In other words the water will flow through the 10-foot pipe six full volumes for every minute. Since the piping contains 1.63 gallons per 10 feet of pipe, multiply 1.63 by six and the final GPM is equal to 9.78 GPM of water flow from the 2-inch diameter pipe.

Jan 19, 2018 | Plumbing

### How many cubic yards for a 20x12 slan 4 inches thick

Assuming that 20x12 means 20 feet by 12 feet, then you take the three values in feet - 20, 12, and .333 (4 inches is 1/3 foot).

Multiply these three numbers to get the cubic feet:
12 x 20 = 240
240 x .333 = 79.92
Now that you have 79.92 cubic feet, to get cubic yards you divide by 9 since there are 9 cubic feet per cubic yard.

79.92 cu. ft. divided by 9 = 8.88 cubic yards (round up to 9).

Jul 27, 2016 | Building Materials

### How much volume in gallons does ten foot of three quarter inch copper pipe contain?

0.23 gallons. Figured out by assuming the pipe is .75 inches inside diameter. To get the volume, calculate the area of the cross-section with the formula Pi times the radius squared. Which is 0.375 squared times Pi = 0.441786. Multiply that times 12 inches per foot times 10 feet = 53 cubic inches. One gallon = 231 cubic inches.

Jun 03, 2015 | Cars & Trucks

### How many gallons of water in 3172 cubic feet of water?

There are 7 1/2 gallons of water in a cubic foot.

3172 x 7.5 = 23,790

To calculate how much water in a swimming pool, in 'US Feet':
Length x Width = Surface Feet
Surface Feet x Average Depth = Cubic Feet
Cubic Feet x 7.5 = Total Gallons

Mar 07, 2015 | Pool & Spa

### 72in x 29in x 24in how many gallons calculator

72 x 29 x 24 = 50,112 cubic inches / 1728* = 29 cubic feet. There are 7.48 gallons per cubic foot, so the tank is actually 216.92 gallons, assuming the dimensions given are inside measurements. I hope you have a strong stand and floor because the water alone weighs 1735.36 pounds (8 pounds per gallon).

*12 x 12 x 12 = 1728 (cubic inches to cubic feet conversion)

Jul 17, 2014 | Aqueon All Glass Aquarium Co. 210 Gallon...

### How to calculate cubic feet?

Multiply 21 inches by 14 inches by 10 inches to get 2940 cubic inches. There are 12 inches in a foot, so there are 12^3=1728 cubic inches in a cubic foot. Divide 2940 cubic inches by 1728 cubic inches per cubic foot to get about 1.7 cubic feet.

Alternatively, first convert all measurements to feet. 21 inches is 1 3/4 feet, 14 inches is 1 1/6 feet, 10 inches is 5/6 feet. Multiply them together to get 245/144 cubic feet, which again is about 1.7 cubic feet.

It's always nice when doing a problem two different ways gives the same answer.

Jul 04, 2014 | Office Equipment & Supplies

### I measured a freezer in inches which Are 20 30 20 Please calculate in cibic feet

20 inches times 30 inches times 20 inches is 12,000 cubic inches. There are 12 inches in a foot, so one foot is 12^3 or 1728 cubic feet. 12,000 cubic inches divided by 1728 cubic inches per cubic foot is about 6.9 cubic feet.

Apr 21, 2014 | Office Equipment & Supplies

### Have no chlorine output! Have put in 4 bags of salt, have also cleaned skimmer box basket, pump basket & cartridge filters. Have noticed that pressure is down to 30kpa when is usually 50kpa. Do I need...

Hi again ... Thanks for the Chat yesterday. Have you considered this article: http://www.directpoolsupplies.com.au/webcontent34.htm (click specifically on maintenance of your salt cell) There are lots of good tips here for the pool owner.

I see that this manufacturer wants 4000 ppm salt (4%) minimum to 7000 ppm salt (7%) maximum which is above the standard here in North America. You are in Australia? According to the manufacturer, your cell may be at the end of its life.

Sudden low filter pressure could be a broken lateral in a sand filter (you would probably have sand in the pool) or a hole in a paper filter (no indicator other than low pressure).

Here are some useful numbers for your 4 X 12 X 30 foot pool:

1440 cubic feet or 40.776259104 cu meters
1 cubic foot = 7.5 gallons or
1 cubic foot = 0.0283168466 cubic meters.
1 cubic meter = 264.172052 US gallons.
1 cubic meter = 1000 liters ( you probably know this stuff though)

I calculate your pool to be about 10800 gallons. The actual gallons per foot is really 7.48 (10771.2 in your pool) but we use 7.5 gallons per foot.

One inch in your pool is 225 gallons or 851.71765 L. This will give you some idea about what chemicals you may have to add with one inch of make up water.

If you were in NJ, and a commercial pool, you would have to have a a 8 hour turn over rate with a filter = 60 square feet and your flow rate would be about 22.5 gallons per minute.

Please keep your water balanced with the proper amount of Calcium (about 350 ppm) your pH at 7.4 - 7.6 your TA around 100 (80 min and 120 max) and your salt per manufacturer recommendation, in this case about 5000 ppm. Cyanuric acid around 80 ("Sun screen" for chlorine) and of course Cl around 3 to 4.

I hope you have found this information helpful. Enjoy your pool, while we shiver here in the North East.

Jan 28, 2011 | Zodiac Duo Clear System Chlorine...

### Pool Sand Filter

The volume of a 24x4 pool is 1809.6 cubic feet [Volume=pi x radius squared x height, or V=3.14159 x(12x12)x4], and the 18 foot pool is 1017.9 cubic feet [V=3.14159 x (9x9)x4]. When you multiply the number of cubic feet by the conversion factor of 7.48 gallons per cubic foot, you come out with 13,536 gallons versus 7614 gallons. Since the volume is nearly double, I don't think the other filter will cut it for very long. Is the top that is cracked in the valve body or the top part of the tank? It might be cheaper and easier to just replace the defective part in the long run than to use an undersized filter that will die prematurely.

Apr 15, 2009 | Hayward Pro Series 18" Above Ground Pool...

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