# How Many Gal Of Water In A 18ft 52in Pool? [Ultimate Guide!]

I bet you’re wondering how many gallons of water you’ll need to cover an 18’x52′ pool. That’s a lot of liquid! You might be thinking to yourself, “this is quite a bit of water to haul around.” You’re not wrong! It’s a lot of water! So how much is it and how do you get it there? Let’s find out, shall we?

## Theoretical Considerations

If you’ve ever taken a math lesson or two, you might know that you can’t always add and multiply together to get the answer you’re looking for. You have to break it down into simple components sometimes. Let’s do a little exercise to make everything crystal clear.

Imagine you have a pool that’s 18’x52′. It’s a rectangular shape and it’s filled with water. To determine how many gallons you have, you need to make a few assumptions. You need to know the volume of one gallon of water, how high the water will be and how fast it will flow. To make it simple, let’s look at these one at a time.

## One Gallon Of Water

To begin with, you need to know the volume of one gallon of water. The answer to this is 31.8 fl oz. To convert this to liters, you would need to multiply by 1.36.

Why does it matter what the volume of one gallon of water is? You can’t compare it to any other gallon measurement because they don’t all hold the same weight. The volume of water changes depending on how deep it is and what type of gas is present in it. For example, a half gallon of oil will displace a half gallon of water in volume when they are mixed together. This is why you need to be careful when comparing different forms of fluids. You will also need to know this number if you want to figure out how much concrete you will need to build a certain sized pool. It’s a common mistake to underestimate how much concrete you will need. You will need to keep in mind that the weight of the concrete influences how fast it will settle once it’s been poured. For example, 10 bags of concrete will float on a lake for a longer period of time than 20 bags. This is also why in some regions it’s common practice to use sand instead of cement as the binder in the concrete because it has a higher water content. Sand is more easily available than cement and it doesn’t take up as much space in your storage shed when you’re done.