A pipe is a long, round or cylindrical, hollow object, usually made of metal, rubber or plastic, through which a liquid or gas can flow.

Volume of a pipe can be useful for a number of reasons, such as calculating the water capacity a pipe can handle.

**Formula to calculate volume of a pipe.**

r – is the inner radius of the pipe. If you have not been given the inner radius but you have the outer radius, subtract the walls width from the outer radius to get the inner radius.

L – is the length of the pipe.

π – is a constant estimated to be 3.142.

**Example:**

Calculate the volume of a pipe whose inner radius is 154 cm and has a length of 1000 cm.

Therefore, the volume of the pipe is 74,536,000 cm³ .