You can now get the hugely popular Gas Rate Calculator & Guide on your iPhone or iPad. This is the free Lite version of the app to which supports metric and imperial meters with natural gas only.

Input the initial meter reading, use the built in 2 minute timer and then input the final reading. Press the calculate button and the results will then be displayed.

The app comes with a built in stopwatch and could not be easier to use: start the stopwatch and after a complete rotation of the test dial press stop and the results will be displayed instantly!

Gas rates are given in cubic metres per hour, litres per second and cubic feet per hour. Gross and net heat inputs are given in megajoules per hour, kilowatts and BTUs per hour.

What’s New

Version 2.5

We've made some small tweaks for iOS 12.

Ratings and Reviews

5.0 out of 5
3 Ratings

3 Ratings

jakepeg129 ,

Fantastic App

After finding a slight error, which was corrected by Leon and the team in what can only be described as lightning speed, this app works as expected as do all the Mr Combi Apps This is one app that I have no hesitation in recommending and is every gas fitters must have app

Russell Baldry ,

Very nice

This app is very quick and simple to use. Clear data and additional info very good. Ideal for quick boiler service info for the engineer

SugdenA21 ,

Young E of the board

Great app as are all this firms easy to use (I am not connected with the firm)


Mr Combi Sales Ltd.
1.4 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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