Free Gas Rate Calculator

Instantly Measure & Gas Rate Appliances

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Download the Gas Rate Calculator App

The exact same calculator, twice the convenience.

  • Keep a results history
  • Get offline access
  • Only one tap away
  • 100% free with zero ads
Our gas rate calculator on your phone

Gas Rate Calculator Instructions


  1. Turn off all other gas appliances
  2. Allow the appliance you are testing to warm up for 10 minutes
  3. Make sure the appliance is on, then take an initial reading
  4. At the same time, start the timer
  5. When the timer is finished, take another reading
  6. Enter in the initial and final readings and click calculate
  7. Record the results.


  1. Turn off all other gas appliances
  2. Allow the appliance you are testing to warm up for 10 minutes
  3. Start the timer
  4. When the meter test dial completes one full revolution, stop the timer. 
  5. Record the results.

An indispensable tool for any gas engineer

Our gas rate calculator can help you get an accurate gas rate recording in seconds.

Up-to-date Formula

100% carefree, reliable, and accurate results

No matter how many times you’ve done it, gas rating an appliance is a finicky process easy to make careless mistakes with. By using a gas rate calculator, you’ll be able to get reliable and accurate results you know you can trust  – for both natural gas and LPG – without having to manually calculate it each time. There's no need for the process to be complicated, so why do it the hard way?

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Tried and Tested by Professionals

Used by thousands every day

We know filling out a gas safe certificate comes with a great deal of responsibility. The last thing you need is to feel like you need to double-check results. Our software and gas rate calculator is regularly used by over 5000+ companies to reliably and accurately gas rate appliances. From this, we’ve continually refined and improved the user experience of our gas rate calculator - both here on the web and in our software.

“I can honestly say this software tool is every bit as important to me as any other tools/devices.”

Since setting up my own business about three years ago I’ve been using Gas Engineer Software and I can honestly say this software tool is every bit as important to me as any other tools/devices required to carry out my daily tasks as a domestic gas engineer specialising in installation, service and repairs. Would definitely recommend this software to anyone that wants a more professional approach to running their business and spending less time doing admin.

Stuart Kershaw, Bolton

TEK Heating Services

Intuitively designed

Gas rate an appliance in minutes

Take readings and calculate gas flow on the fly. If you sign up for our software, results are saved and you can always come back later on and write down the result when convenient. Our calculator has also been designed to be as intuitive and simple as possible without reducing its core functionality. 

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Part of the Gas Engineer Software ecosystem

Use on the web or in our software

A gas rate calculator is a lifesaver for gas engineers - but the team at Gas Engineer Software works on much more. We offer an all-in-one job management platform designed specifically for gas engineers like you, helping save time, money, and effort. Our gas rate calculator is seamlessly integrated into our paid software and plays a small role in the bigger picture. So whether you need scheduling tools, digital gas safe certificates, and so much more, we're here to help you find success. 

Frequently Asked Questions

What is a gas rate calculator?

Gas engineers frequently need to calculate the gas consumption of an appliance to determine whether it is operating safely and within manufacturer specifications. A gas rate calculator is a simple tool designed to help you quickly and accurately calculate this rate based on a few simple inputs. It helps you save time, reduce human error, and get results you can trust.

How do you calculate a gas rate?

Calculating an appliance’s gas rate using the calculator is made simple with a calculator like ours. The gas rate refers to the volume of gas passing through the appliance within a certain period of time.

If you are calculating in metric, all you need to do is take an initial gas meter reading, start the timer, and then take a final reading. For imperial, you simply have to start the timer, stopping it when the dial completes one full revolution. The calculator does the rest.

Are gas rate calculators reliable?

The short answer is yes. Our calculator is used by thousands of gas engineers each day. We’ve made sure our formula is accurate and up to date. It also helps eliminate the chance of human error.

What is the benefit of using the gas rate calculator with Gas Engineer Software?

A standalone calculator is a great tool to keep in your belt. But its true value is unlocked when used together with our software platform. Once you get a gas rate result, our software will automatically store it, so you won’t have to redo the test if you forget where you wrote it down. Your results are also integrated with our electronic gas safe certificates, making the whole process quicker and easier.

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