How many gallons in a 3ft by 18inch by 18 inch fish tank?

Answer 1

A aquarium that size could hold about 50 gallons of water. Remember when stocking your aquarium that, as a rule of thumb, when keeping a freshwater aquarium you should have about one inch of fish for every two gallons until it cycles; then you can go with one inch of fish per gallon. If you plan on setting up a saltwater tank, which is much more difficult to set-up and maintain, go with 1 inch of fish for every four gallons for the first six months; then one inch of fish for every two gallons. If keeping goldfish you should have about 1 inch of fish for every four gallons until the tank cycles; then one inch of fish for every two gallons.

Answer 2

Assuming the depth is also 16 inches it would be 40 gallons. 36x16x16 = 39.9 gallons.

Answer 3

That depends upon how deep and high it is.

Answer 4

A tank has three measurements. Length, height and depth. You have given only 2.

Answer 5

36x16x20=11520 cu inches, =6.6667 cu ft=49.87 gallons

Answer 6

Try using the website in the sources and related links below.

Answer 7

Without knowing width we can't answer, but they are in 5 gallon increments usually.

Answer 8

In order to calculate a tank volume, you need three measurements - Length, Width, and Height.