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Easily convert volume into gallons with our free Volume to Gallons Calculator. Find tank size, water capacity, and liquid volume in seconds.
Ever stood by a big tank and asked, “How many gallons does this hold?” You’re not alone. Whether it’s a water tank, a swimming pool, or even a round tub, knowing the volume in gallons saves time and money. That’s why we built this Volume to Gallons Calculator. It’s fast, simple, and easy for anyone to use.
This tool converts different units like liters, cubic feet, and cubic inches straight into gallons. No need to memorize tricky formulas. Just enter your numbers, and you’ll get instant results.
The idea is simple. Every gallon matches a set number of liters or cubic inches. Once you know that, the math becomes easy.
Basic formulas:
So, if you’ve got a tank with a known volume in liters, divide by 3.785. You’ll get the volume in gallons. If the volume is in cubic feet, multiply by 7.48.
For example:
A tank with 100 liters of water.
100 ÷ 3.785 = 26.42 gallons.
Imagine you’ve got a rectangular tank. The formula is length × width × height. This gives you the volume in cubic units. Convert that into gallons using the formulas above.
Round tanks work a little differently. You’ll need the radius and height.
The formula is:
π × radius² × height.
Say your round tub has a radius of 1.5 ft and height of 2 ft.
Volume = 3.1416 × (1.5 × 1.5) × 2 = 14.13 ft³.
Now, 14.13 × 7.48 = 105.73 gallons.
Using our tool feels like second nature. Here’s how it goes:
You’ll also see the math steps, so you know exactly how the number came up.
Water tanks come in many shapes. The math depends on the shape.
After you get the volume, convert it into gallons. It’s that easy.
Our Volume to Gallons Calculator takes away the guesswork. You don’t need to stress over complex math or hidden formulas. Just plug in your numbers, and the tool does the rest.
Whether you’re filling a pool, buying a tank, or measuring a tub, this calculator gives you the right answer in seconds. Simple, fast, and accurate just the way it should be.
Convert your volume into liters or cubic feet. Then use the formula: liters ÷ 3.785 = US gallons. Or cubic feet × 7.48 = US gallons.
Measure the tank size. Use the right formula for the shape. Convert into gallons using the constants above.
Find the dimensions of your tank. Apply the shape formula, then convert the result into gallons.
Use π × radius² × height to get cubic feet. Multiply by 7.48 to get gallons.