Blog Post Shape

FREE Pipe Volume Spreadsheet

Access h2x's free pipe volume spreadsheet to streamline calculations, optimise design, and enhance efficiency in piping projects.

how to use pipe volume calculator 1 pipe size internal

Download your free PDF of this article below.

Some examples of where the pipe volume calculation and results are used are:

  • The structural engineer will design their structure to handle the weight of pipes
  • The plumbing engineer needs to be aware that long ‘dead-legs’ have lots of consequences. ‘Dead-legs’ are the cold water that is drawn off before heated water commences to discharge from the heated water outlet e.g. waiting for the cold water to turn warm before getting into the shower. The consequences of having long dead-legs are:
  • The end-user will be unhappy waiting a long time for warm water, especially if they are in a building such as a luxury hotel
  • The client will not want to cover expensive bills from the wasted water and energy
  • Sustainability consultants often like to minimise the wasted water and energy to achieve a better rating for building’s sustainability

Youtube Project video CTA

Pipe Volume Formula

It is relatively easy to calculate the volume of water in a pipe by yourself, using a simple formula.

The volume of water in a pipe is calculated by multiplying the internal diameter of the pipe by its length. The calculation is dependent on two factors:

1. The internal diameter or the radius of a pipe

(as the diameter or the radius of a pipe increases, the pipe volume also increases)

2. The length of the pipe

(as the length of a pipe increases, the pipe volume also increases)

The volume of a pipe is measured in litres (L), metres cubed (m³), or gallons (gal).

The formula that you can use to measure the volume of a pipe is:

V = π⋅(D/2)²⋅L

In the pipe volume formula:

V is the pipe volume

D is the diameter of the pipe

L is the length of the pipe

π has a constant value of 22/7 (3.14)

Wait Time Formula

Once you know the pipe volume, you can also calculate how long you will need to wait for the water to come out of the outlet (e.g. the shower or sink).

The outlet flow rate is measured in litres per second (L/sec), metres cubed per second (m³/sec), or gallons per minute (gpm).

The formula that you can use to measure the wait time is:

T = V / Q

In the wait time formula:

T is the time

V is the pipe volume

Q is the outlet flow rate

Free Pipe Volume & Wait Time Spreadsheet

You can download the free pipe volume spreadsheet here in Metric or Imperial.

Dead Legs CTA

How to Use The Pipe Volume and Wait Time Spreadsheet

The pipe volume calculator comes with simple instructions. As shown below, you are required to enter information into certain cells and the results will be provided:

how to use pipe volume and wait time spreadsheet

If you want to calculate the volume across multiple sections of pipes that differ in size, the pipe volume spreadsheet is set up to allow you to get those results too.

It is very important that you use the internal pipe diameter in the calculation, using the nominal or outside pipe diameter will produce the wrong results.

The spreadsheet also includes some generic pipe data but please do some research to ensure they are correct for your application before using them.

spreadsheet showing generic pipe data

Create a Pipe Volume Chart

You can also create your own charts in the pipe volume spreadsheet.

Again, there are simple instructions that direct you to enter information into certain cells and the results will be provided:

create a pipe volume chart on pipe volume spreadsheet

Once you have created the chart, you can export it as a PDF to be referred to in the future.

FREE Pipe Volume Spreadsheet

How Can h2x Help With Pipe Volume Calculations?

When you use h2x, the pipe volume calculation is automatically undertaken as you draw your layout. The results are shown below:

how can h2x help with pipe volume calculations

You can also export a PDF of the project with the dead-leg results showing. You can share this with the project team to provide evidence that the plumbing system has been designed with the pipe volume and dead-legs in mind.

Want to Learn More About Pipe Volumes and Dead Legs?

You can read this post about why ‘length’ should not be used as a measurement for dead-leg calculations.

h2x: All-In-One Tool for Calculating, Designing, Estimating, and Paperwork

h2x Exports

What's in the Pipeline?

Get technical resources delivered to your inbox weekly!

Award-Winning Heating Design

"Using h2x was pivotal, allowing for precise heat loss calculations, pipe sizing and flow rates for each room.

This level of detail ensured that the heating load accurately matched each space's requirements, minimising energy waste and maximising comfort.

The strategic placement of heat pumps and careful sizing of pipework were crucial in maintaining minimal pressure drops over an 18-metre distance."

Greengate, UK

"I would estimate over the length of this project, I have spent 50% less time designing than I would on our previous software.

The ability to output the design straight into Revit assisted clash detection and coordination."

Salon Republic, USA

"The quality of the designs saw significant improvement with the adoption of h2x."

"The software offers precision through detailed result outputs and advanced options for efficient pipe sizing, allowing heating engineers to optimise based on parameters like maximum velocity and pressure drop."


What Installers Say

What Consultants Say

A game changer for the humble plumber. Incredible.

Brad Winkel

Director at Queenstown Plumbing

Brilliant, simple and easy to use. Game changer.

James Major

Director at Hubb

Big time game changer to the industry!

Viv Jude

Director at UHC

Incredible software! Super user-friendly and allows you to save so much time.

Devni Gamage

Engineer at DMA

h2x is great software, our company use it nearly every day. It is easy to use with direct conversion from h2x to Revit.

Callum Craig

Engineer at WDE

h2x is fantastic software. It is very easy to use and the ability to output to Revit is a fantastic time saver.

Joe Kirrane

Engineer at MEP