# Gas Rate Calculator & Guide > Gas rate calculator, guide, and testing tools for professionals. (iPhone/iPad app by Mr Combi Training.) - Source: https://appshunter.io/ios/app/gas-rate-calculator-and-guide/id588849050 (this page in markdown: same URL + `.md`) - Developer: [Mr Combi Training](https://appshunter.io/developer/566867832) - Category: Productivity, Utilities - Price: $4.99 - Age rating: 4+ - Requires: iOS 11.0 · 2 MB - Languages: American English - Released: 2013-01-21 - Data updated: 2026-08-28 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/gas-rate-calculator-and-guide/id588849050/reviews.md ## What is Gas Rate Calculator & Guide? This is the feature packed Gas Rate Calculator & Guide, from Mr Combi Training! We've managed to cram all of this into one app.... • Metric and imperial gas rate calculators • Save, email or export your results to other apps such as Dropbox, Google Drive or Evernote • Built-in torch • Tightness and let-by timer • Conversion calculator • Full gas rate guide • Supports natural gas, butane and propane • Save manual calorific values for improved accuracy • Select between a 1 and 2 minute timer for metric meters • Selectable timer alert • Supports ¼ft³, ½ft³ 1ft³, 2ft³ and 5ft³ imperial test dials A guide has been built into the app with 6 pages: • Metric gas rate calculations • Imperial gas rate calculations • Heat input calculations • Let-by test procedure • Tightness test procedure • Permissible drops on the tightness test An extra Converter calculator is included in the app for simple conversions between gas rates and heat inputs. Simply select the type of gas, enter a value, select the units, press the 'Calculate' button and the calculator will show all gas rates (cubic metres per hour, cubic feet per hour and litres per second) and heat inputs (MJ/h, kW and BTUs per hour) based on the CV. The Tightness Testing function allows you to quickly select between the let-by and tightness tests and has an easy to use timer. No longer do you need to fiddle about with your phone's timer! Calorific values can be entered manually (and saved) for more accurate gas rate calculation results. The calorific value of natural gas in the UK varies from about 38.3 to 40.5 MJ per cubic metre; this can mean a difference in the gas rate calculation of more than 5%! With this calculator you can add the CV for your area in the settings page and avoid these inaccuracies. The default values set for butane and propane are both the same as supplied by Calor and BOC. The metric timer can be set to either 1 or 2 minutes. For U6 and G4 meters one minute is sufficient, for E6 meters two minutes is recommended for accuracy. The timer can be set to an audible alert, vibrate, both or neither. A torch function is included with this app if your device has an LED flash. ## Key features - Metric and imperial gas rate calculators - Tightness and let-by timer - Conversion calculator - Full gas rate guide - Manual calorific value input - Torch function ## Recent user reviews (10 of 10) All indexed reviews: https://appshunter.io/ios/app/gas-rate-calculator-and-guide/id588849050/reviews.md ### 3/5 — Needs work *2022-09-01* Good app, but can you put calculate and reset side by side rather than on top of one another. The amount of times I’ve hit reset!!!! Annoying Thanks ### 5/5 — Gas rate *2020-04-02* I have been using this app for over a year and I’m very happy with it! I fully recommend it. ### 5/5 — Great apps *2017-10-04* Great apps stops me worrying about ACS ### 5/5 — My go to app *2016-08-26* Having dropped from industrial gas back to commercial gas and tried most apps here this is my go to app for gas rates. With the ability to save so I have proof always at hand should I ever need it. Well worth the price and surprised not many reviews. ### 5/5 — Best. *2015-11-17* I'm surprised that this app hasn't got any review yet. I've tried all the free ones but they are rubbish with so many annoying ads. This one is not free but definitely worth it. I'm well pleased. ### 5/5 — Great app *2015-07-05* Nice and easy to use and quick if you haven't got time to work it out ### 5/5 — Mr *2015-05-18* Great apps very good for apprentices training too. Have never gave up showing others! ### 5/5 — Mr combi apps *2015-01-10* Probably the best boiler Engineer app Iv seen or used highly recommend these ### 5/5 — Excellent *2014-03-12, version 2.0* Great app ### 5/5 — Mr Combi gas rate app *2013-01-27* I know it's on the analyser but the guide and info is much better as are all his apps ## Frequently asked questions about Gas Rate Calculator & Guide ### What types of gas does Gas Rate Calculator & Guide support? Gas Rate Calculator & Guide supports natural gas, butane, and propane. It allows for manual input of calorific values for improved accuracy, which is particularly useful as the calorific value of natural gas can vary significantly. ### How does Gas Rate Calculator & Guide help with gas rate calculations? The app offers both metric and imperial gas rate calculators. You can input values and select units to see all gas rates and heat inputs based on the calorific value (CV), ensuring precise calculations for different meter types. ### Can I save my calculation results with Gas Rate Calculator & Guide? Yes, you can save, email, or export your results to other cloud storage apps like Dropbox, Google Drive, or Evernote. This feature makes it easy to document and share your findings. ### What testing functions are available in Gas Rate Calculator & Guide? Gas Rate Calculator & Guide includes a Tightness Testing function with an easy-to-use timer for both let-by and tightness tests. It also provides a guide on permissible drops for the tightness test. ### Does Gas Rate Calculator & Guide have ads? No, Gas Rate Calculator & Guide does not contain advertisements. As a paid application, users can expect an ad-free experience. ### What is the price of Gas Rate Calculator & Guide? Gas Rate Calculator & Guide is a paid application priced at $4.99. This one-time purchase provides access to all its features without any additional costs or subscriptions. ### How often is Gas Rate Calculator & Guide updated? The app was last updated on April 28, 2023, with version 2.6. This indicates that the developer actively maintains and improves the application. ### What devices is Gas Rate Calculator & Guide compatible with? Gas Rate Calculator & Guide is compatible with iPhones, iPads, and iPods. It is designed for iOS devices. ## Version history (last 5 releases) ### 2.6 — 2023-04-28 - Upgrade the app  - Remove some sections. ### 2.5 — 2023-04-20 We have updated this version to load quicker on most devices ### 2.4 — 2018-12-05 We've made some small tweaks for iOS 12. ### 2.3 — 2015-08-01 We've changed the colour of the Gas Rate Calculator to a lovely shade of copper (it's definitely not brown, okay?). Also, for iOS 8 users we've added new navigation buttons when entering data. ### 2.2 — 2015-01-17 Notifications! In this update we've added support for notifications when the app goes into the background. If you're busy doing something else whilst a timer is running you'll get a notification as soon as the timer completes. We've also improved the timer code so that it never resets itself if the app goes into the background. AND we've added support for ½ ft/rev imperial test dials. ## Apps similar to Gas Rate Calculator & Guide | App | Rating | Price | Category | | --- | --- | --- | --- | | [KANE LIVE](https://appshunter.io/ios/app/kane-live/id1594399447) | — | Free | Productivity | | [Heat Engineer](https://appshunter.io/ios/app/heat-engineer/id879510552) | — | Free | Productivity | | [Spruce Energy](https://appshunter.io/ios/app/spruce-energy/id6530588740) | — | Free | Productivity | | [Gas-main](https://appshunter.io/ios/app/gas-main/id1522466692) | — | Free | Productivity | | [Oneserve Mobile](https://appshunter.io/ios/app/oneserve-mobile/id1353483232) | — | Free | Productivity | ## More apps by Mr Combi Training - [Gas Pipe Sizing Calculator](https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id570414217) - [Gas Ventilation Calculator UK](https://appshunter.io/ios/app/gas-ventilation-calculator-uk/id584042243) - [Heatloss Calculator & Guide](https://appshunter.io/ios/app/heatloss-calculator-and-guide/id620793018) - [Wiring & Controls - Diagrams](https://appshunter.io/ios/app/wiring-and-controls-diagrams/id1021997871) - [Fault Finding & Multimeters](https://appshunter.io/ios/app/fault-finding-and-multimeters/id1212143364) All apps by Mr Combi Training: https://appshunter.io/developer/566867832 ## Related topics [gas rate calculator](https://appshunter.io/ios/topics/gas-rate-calculator) · [gas rate](https://appshunter.io/ios/topics/gas-rate) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*