19"x60"x20"=22800 cu ins. 231cu ins = 1 gallon US. Therefore 22800 divided by 231 will give the volume in Gallons US which is 98.7. So after deducting an aproximation of what water will be displaced by gravel and rocks and also accounting for what is left vacant at the top 1 inch of the tank, you can safely assume the tank will probably be holding around 85 gallons US when it is in use.
A container that is 48x12x12 inches in size holds approximately 29 gallons of liquid.
= 93.09 gallons (US) = 77.51 gallons (imperial)
This container could hold up to 3,949.71 US gallons of water.
Volume = 29 x 21 x 9 = 5,481 cubic inches = 23.73 gallons (rounded)
About 47.6 gallons
The container has a volume of 4160 cubic inches (26x16x10). Assuming you are talking about gallons of water, it will hold 18 gallons (231 cu in per gallon).
44.88 gallons
Assuming it is a rectangle, 8.485 US gallons
Figure the volume in cubic inches and divide by 277.4 to get the number of gallons the container will hold. This is A close approximate formular. Convert the gallons to pints or less if it is a small container.
This container would hold approximately 45 gallons of water.
74.42 gallons.
2.961 US gallons