How Many Gallons Does a Toilet Tank Hold? 

The toilet is an essential part of the household. A toilet tank uses fresh water directly from the supply line, which people use for bathing, cloth washing, and other work too. 

In the earlier 90s, there was no problem with wasting fresh water for toilet use. But these days, each drop of water counts.

That’s why everyone is concerned about how many gallons does a toilet tank hold? Well, a modern toilet tank should hold between one to two gallons of water. Let’s learn a bit elaborately.  

How Much Water is Supposed to be in a Toilet Tank?

Earlier in 1900, the older toilet could hold about six or seven gallons of water in the toilet tank. But with the growing world, people realized the importance of fresh water. Water is the most valued resource upon which almost every species depends. 

Besides, the water bill these days is sky high because of the water shortage. So, people start thing about making a new type of high-efficiency toilet. A high-efficiency toilet holds around 1.6 gallons of toilet water in the tank. Moreover, some newer toilets use lesser water than these.

They use about 1.28 gallons per flush which is quite good compared to an older toilet. The toilet company and scientists are trying hard to conserve more water from toilet use. 

How to Use Toilet Water Efficiently?

Here are some water conservation tips for you. Expert says a toilet should use around 1.4 gallons of water, and the rest of the water is just waste. If you don’t know how much water your toilet tank holds, first try to know that. Let us teach you a technic to check manually if your toilet tank doesn’t have a water meter.

First, turn off the direct water supply valve to the tank. Next, use the toilet flush valve to flush the remaining water and open the tank’s cover head. Now, you should see a water level mark. Take a bucket of water and start pouring it over the tank; when it’s up to the marked stop.

Now that you know the exact amount of water in the toilet tank, let’s focus on water conservation tips. If your toilet wastes more than 1.4 gallons of water, you can just put a brick in the toilet tank, reducing water usage. But it shall affect the water efficiency of the toilet tank.

Another trick is just to fill a bottle of water and keep it inside the tank. It, too, will decrease the water efficiency, though.

See Related: what to put on toilet tank for decoration


In a growing world, we can’t afford excess water usage. The world’s population would be extinct if we couldn’t save water. Besides, the water bill is now a concern in big cities. It’s a sign of a water shortage. So, we should start saving water from home, even from a toilet tank.


What size tank is a standard toilet?

What size tank is a standard toilet
What size tank is a standard toilet

The water capacity in today’s standard toilet tank is set at around 1.6 gallons. But it’s not enough. The amount should be reduced to 1.4 or 1.3 gallons.

Can I fill my toilet tank with water?

Can I fill my toilet tank with water
Can I fill my toilet tank with water

Yes, of course, you can fill your toilet tank with water from outside. Just take a bucket of water, shut off the water supply valve, flush out the water and pour the water down. But it’s highly unusual.

Related Resource: why won’t my toilet tank fill up with water

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