How to find gallons in square pots?

[purpledomgoddes]

can make/determine any volume desired.

length*width*heigth

example:

container is 12" (us inches)*12*12, or 1 cubic foot

so, converting into centimeters, we have ~12*2.5^3 (cubed), or 30cm*30cm*30cm=27,000 cubic centimeters, or divided by 1,000, 27 liters (27000/1000=27)...

27 liters divided by 3.785 (1 gallon=~3.785 liters)=~7 gal. (27/3.785=~7).

actual math:

12*2.54=30.48

30.48^3=28316.85

28316.85/1000=28.32

28.32/3.785=~(approximately)7.48 gallons.

just convert inches into centimeters. cubic centimeters are same as milliliters, or 1 thousandth of a liter. so can just divide total cc/ml volume of any container to get amount in gallons vessel can hold.

thus, cubic cm(l*w*h in inches times 2.54)/1000=liters. divide this # by 3.785 to get volume capacity in gallons.

hope this helps. enjoy your garden!

 

[hoosierdaddy]

All that is fine and well, purpledomgoddes...if we want to know what the amount of WET gallons is.

Do your math with what a dry gallon really weighs (4.4 liters) and see what you come up with.... (1 dry liter = .227 gals)

2.54 x 12 = 30.48
30.48 cubed (30.48 x 30.48 x 30.48 = 28316.85)
28316.85/1000 = 28.3
28.3/4.4 = 6.4

 

[messn'n'gommin']

As a point of information to me and not being very good at math, would measuring the width at the top and then the bottom, splitting the difference and then doing the calculations yield the same result as the longer equations? e.g. Would 5.5" at the top and 4.5" at the bottom averaged to 5" in the middle, then squared and multiplied by the height, give the same answer as derived from the more complex formulas?

Namaste, mess

 

[kaljukajakas]

As a point of information to me and not being very good at math, would measuring the width at the top and then the bottom, splitting the difference and then doing the calculations yield the same result as the longer equations? e.g. Would 5.5" at the top and 4.5" at the bottom averaged to 5" in the middle, then squared and multiplied by the height, give the same answer as derived from the more complex formulas?

That's exactly what the formula I gave does. As long as the shape is a topless pyramid, the formula will give the true volume. This is because you can cut up and reassemble a topless pyramid in such a way that it will be a perfect rectangular cuboid (square prism).

Actual pots have bends and radiuses, which means you have to measure the volume to get accurate to the cubic inch or less.

 

[purpledomgoddes]

All that is fine and well, purpledomgoddes...if we want to know what the amount of WET gallons is.

Do your math with what a dry gallon really weighs (4.4 liters) and see what you come up with.... (1 dry liter = .227 gals)

2.54 x 12 = 30.48
30.48 cubed (30.48 x 30.48 x 30.48 = 28316.85)
28316.85/1000 = 28.3
28.3/4.4 = 6.4

for clarity...

if the dry weight is desired, use math in last post, then divide(/) by 1.1636.

7.48gal(water volume)/1.1636=~6.42gal(dry weight volume).

so, convert inches to cm, find cubic cm (which is ml/thousandth of a liter), convert to water volume (x/1k), then divide by 1.1636, to get number desired.

hope this helps.

 

[petemoss]

put a plastic bag in the pot....fill it up with water....see how much water went into it...theres your answer.HH. =]-~

I think happyherb gave the best answer! Simple, practical and no calculator needed & works for any shape pots.

Sorry, hoosierdaddy, you're right of course...I just couldn't resist.