# Pipe Volume Calculator

Enter the length and diameter of your pipe in inches, and our calculator will determine the pipe volume in cubic inches, gallons, and pounds.

## Pipe Volume Calculator

Enter the inner diameter and length of the pipe to calculate the volume:

• liters
• cubic inches
• gallons
• pounds To calculate pipe volume in cubic inches, you’ll need the diameter and length of the pipe in inches. Here is the pipe volume formula:

`Pipe Volume = π x (diameter²/4) x length in inches`

Once you’ve determined the cubic inches of the pipe, you can convert them to gallons with the following formula:

`Gallons = cubic inches ÷ 231`

If you’d like to know the liquid density in pounds, multiply your cubic inches by 0.036.

`Pounds = cubic inches x 0.036`

Refer to our chart below for the pounds, cubic inches, and gallons of water per foot of pipe.

Pipe SizeVolume (in³/ft)Volume (gallons/ft)Weight (lb/ft)
1/16"0.0368 in³0.000159 gal0.001331 lbs
1/2"2.356 in³0.0102 gal0.0852 lbs
3/4"5.301 in³0.0229 gal0.1916 lbs
1"9.425 in³0.0408 gal0.3407 lbs
1 1/4"14.726 in³0.0637 gal0.5323 lbs
1 1/2"21.206 in³0.0918 gal0.7665 lbs
2"37.699 in³0.1632 gal1.363 lbs
2 1/2"58.905 in³0.255 gal2.129 lbs
3"84.823 in³0.3672 gal3.066 lbs
3 1/2"117.215 in³0.5076 gal4.236 lbs
4"150.8 in³0.6528 gal5.451 lbs
5"235.62 in³1.02 gal8.517 lbs
6"339.29 in³1.469 gal12.264 lbs

## Calculating Pipe Volume: Example

If you’d like to know how to calculate pipe volume manually, we’ll review an example.

Example: Your pipe’s dimensions are 2 inches in diameter and 25 feet long.

The first step is to convert the length to inches. Since there are 12 inches in a foot, we’ll multiply 25 x 12 to determine the length in inches.

25 x 12 = 300 inches

From there, we can plug numbers into our pipe volume formula. We will use 3.1415 for π. Our formula will look like this:

• Pipe Volume = 3.1415 x (2²/4) x 600

Now we can solve the equation

• Pipe Volume = 3.1415 x 1 x 600
• Pipe Volume = 1,884.90 cubic inches

We can convert cubic inches to gallons by dividing by 231:

• 8.16 Gallons = 1,884.90 ÷ 231

We can determine the liquid density of the pipe in pounds by multiplying cubic inches by 0.036:

• 67.86 lbs. = 1,884.90 x 0.036

## How Do I Calculate How Many Liters of Water a Pipe Will Hold?

If you’re looking to calculate how many liters of water a pipe will hold, start by using our equation to determine the pipe volume in cubic inches.

Pipe Volume = π x (diameter²/4) x length in inches

Then convert cubic inches to liters by dividing by 61.0237.

Liters of water a pipe can hold = cubic inches ÷ 61.0237