A simple heat input and gas rate calculator for timing Natural Gas installations. Time the Metric meter for any time (two minutes is more accurate), input the first and second reading, press calculate and your answer is there.
For imperial meters time, one revolution then press calculate, with out putting readings into the metric reading boxes and your answer is there.
No more looking up charts or using long-winded calculations... It is so simple

What’s New

Version 6

Minor Fix to App, added marketing URL

Ratings and Reviews

2.5 out of 5
24 Ratings

24 Ratings

Vxpro ,

App crash

It works ok. But when you go to info button. It won’t go back to main screen. It just freezes on page turn screen.

Hit factory ,

Good app liked older version better

Have used this app since I first got an iPhone 4 works really well unless meter is in the .900 then meter resets to zero it wont calculate it but not a prob at all. The new updated version for ISO 10 is no longer full screen old version was much nicer not sure if this can be sorted but will continue to use it as I love the app.

Tripod80 ,


Have used this app now for a couple of years and it’s been very reliable and acceptable.
However since it’s recent update it is even better.
Excellent app. Well recommended

App Privacy

The developer, GB-GAS.CO.UK, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

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

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