Measuring pots to figure out gallons and...

[Guest]

One cubic foot of water is 7.5 gallons, and a cubic foot equals 1728 cubic inches so 230.4 cubic inches equal one Gallon

To find out the cubic feet or inches also knows as volume of a square or rectangular pot. Base multiplied by the height multiplied by the width will give you the cubic inches or feet depending what you used to measure the sides in the first place.
Heres a visual

To find out the cubic feet or inches also knows as volume of a cylinder or round pot. Multiply the radius squared by the height. The actual formula is

Here is a visual

Hopefully knowing the above information can help you determine the volume of pots you need at the store just by doing a little math in your head. Let us say you need a pot that holds 2 gallon; simply multiply in your head a few numbers. R=4'' H=10'' , 16'' x 10'' = 80'' x 3(pi)= 502.45'' so a round pot sized 8 inch diameter and 10 inch height will hold a little over 2 gallons of water.

 

[ninfan77]

Or you could look @ the label on the side... 5 gallon bucket

 

[Guest]

Thats right,I know the classic series intimately.The trade size classic 300 1 gal container is about .6 gallons.The classic 600 my favorite of favorites is 1.6 gal yet classified as 2 gal nursery size.I veg my blockhead clones to 27-30 inches in these babies.Then its off to the classic 1200 3 gal nursery size,pretty close at 2.9 I think..Anyway veg in these for a few days, flower, and stroke yourself.If you want to measure a gallon of soil use a wide mouth 1 gallon plastic juice container Homeslice

 

[greenhead]

Many containers, if not most that I have seen have a smaller diameter on the bottom compared to the top.

If you wanted to measure these accurately, would it be best to calculate 2 different pot volumes (one using the top diameter & one using the bottom diameter), and then arrive at an average ?

And yeah, I have found out myself, that the figures that the manufacturers give are baloney. I thought that my first grow was done in a 5 gallon pot, but in reality it was closer to 4 gallons.

 

[Guest]

Its best to use the manufacturers chart,they all have one.I prefer the NSI blow molded classic series,I use two sometimes three of them.I use the classic 600 and 1200 for clones and sometimes I'll flower seedplants in the classic 2000.http://www.nurserysupplies.com/products/blowmold/bm.php

 

[Guest]

Math for an answer. Determine the surface area first. Multiply (pi) 3.14 x radius Then multiply the resulting number times itself. This will give you the cubic inches at the top. Next multiply that number times the height (in inches) for the total cubes! Most pots taper to the bottom so deduct what you think it might be. It all depends on how fast the taper is in making that estimate.

TyStik

 

[Guest]

haha I guess NSI is more popular than I thought jiggy.The classic 1200 is my flowering staple