Pipe Volume Calculator

Calculate the volume of a pipe given its inner diameter and length. The calculator will also find how much that volume of water weighs.

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How to Find the Volume of a Pipe

The volume of fluid in a pipe can be found given the inner diameter of the pipe and the length. To estimate pipe volume use the following formula:

volume = π × radius2 × length

Find the diameter and length of the pipe in inches or millimeters. Use our feet and inches calculator to calculate a length in inches or millimeters. To get the radius of the pipe divide the diameter by 2.

If you’re unsure what the inner diameter of a pipe is but you know the outer diameter refer to the common pipe dimensions tables to find the most likely inner diameter of your pipe.

Enter the length and radius values into the formula above to find the volume.

Drawing of a pipe showing the diameter and length.

Example: For a 1″ pipe that is 50′ long


radius = 1″ ÷ 2 = .5
length = 50 × 12 = 600
volume = π × radius2 × length
volume = 3.1415 × .52 × 600
volume = 3.1415 × .25 × 600
volume = 471.24 in3

Volume and Weight of Water for Common Pipe Sizes

Volume and weight of water per foot for common pipe sizes
Pipe Size Volume Weight
in in3/ft gallons/ft lb/ft
1/8 0.1473 in3 0.000637 gal 0.005323 lbs
1/4 0.589 in3 0.00255 gal 0.0213 lbs
3/8 1.325 in3 0.005737 gal 0.0479 lbs
1/2 2.356 in3 0.0102 gal 0.0852 lbs
3/4 5.301 in3 0.0229 gal 0.1916 lbs
1″ 9.425 in3 0.0408 gal 0.3407 lbs
1 1/4 14.726 in3 0.0637 gal 0.5323 lbs
1 1/2 21.206 in3 0.0918 gal 0.7665 lbs
2″ 37.699 in3 0.1632 gal 1.363 lbs
2 1/2 58.905 in3 0.255 gal 2.129 lbs
3″ 84.823 in3 0.3672 gal 3.066 lbs
4″ 150.8 in3 0.6528 gal 5.451 lbs
5″ 235.62 in3 1.02 gal 8.517 lbs
6″ 339.29 in3 1.469 gal 12.264 lbs
Volume and weight of water per meter for common metric pipe sizes
Pipe Size Volume Weight
mm mm3/m liters/m kg/m
6 mm 28,274 mm3 0.0283 l 0.0283 kg
8 mm 50,265 mm3 0.0503 l 0.0503 kg
10 mm 78,540 mm3 0.0785 l 0.0785 kg
15 mm 176,715 mm3 0.1767 l 0.1767 kg
20 mm 314,159 mm3 0.3142 l 0.3142 kg
25 mm 490,874 mm3 0.4909 l 0.4909 kg
32 mm 804,248 mm3 0.8042 l 0.8042 kg
40 mm 1,256,637 mm3 1.257 l 1.257 kg
50 mm 1,963,495 mm3 1.963 l 1.963 kg
65 mm 3,318,307 mm3 3.318 l 3.318 kg
80 mm 5,026,548 mm3 5.027 l 5.027 kg
100 mm 7,853,982 mm3 7.854 l 7.854 kg
125 mm 12,271,846 mm3 12.272 l 12.272 kg
150 mm 17,671,459 mm3 17.671 l 17.671 kg