# Gas Pipe Sizing Calculator — user reviews > 14 indexed App Store user reviews of Gas Pipe Sizing Calculator by Mr Combi Training, rated 4.00/5 from 1 ratings. - Source: https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id570414217/reviews - App overview in markdown: https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id570414217.md - Rating breakdown: 5★ 0 · 4★ 1 · 3★ 0 · 2★ 0 · 1★ 0 ## Most critical reviews (10 lowest-rated) ### 1/5 — Only seems useful for 1 appliance *2024-11-07* This app only seems useful for 1 appliance, it doesn’t seem of any use at all when needing to size a normal domestic set up with a gas fire, cooker & boiler (for example.). I know how to input the data but there’s no tutorials and weirdly the input sections and summary are written in black ink with a black background or white ink style with a white background making it very difficult to read ### 1/5 — Don't waste your money *2014-03-26* Don't waste your money call you local plumbing supply for help,this is just the waste!!! ### 1/5 — Doesn't work. *2013-05-13* Cannot calculate over 98 feet. This does no good for what is needed in my job applications. A refund would be greatly appreciated. ### 1/5 — Rubbish *2013-02-18* Wanted a quick guide for 110kw 3 boilers in industrial building. The app stops at 30m! DO NOT WASTE YOUR MONEY! ### 1/5 — What's the point *2013-02-01* What good is this app with a max distance of 30m including fittings I can work that out easily I purchased this app for non standard installations not the everyday you require 22mm pipe jobs ? ### 1/5 — POS *2013-01-11* Metric crap! Very limited! ### 1/5 — Unhappy *2013-01-08* Energy only in kw not btus, in metric not nominal, only natural gas no propane. Not user friendly , having to make conversions ### 3/5 — Basic pipe calculator *2017-03-19* Basic straight length calculator where it is up to the user to calculate effective pipe length and make their own allowance for bends and fittings. The user will need to do a carcass drawing and note pressure drop and check index runs do not exceed 1mb drop on nat gas. Tends to allow pressure drop of up to 0.5mb on each length and would be useful if it calculated down to .15 drop as if you various branches on larger pipe work. This needs to be used by someone that knows exactly what they are doing. Have used others where the carcass could be input inc branches and end loads and then changes made automatically resize whole project. ### 5/5 — Colin *2018-09-27* Does exactly what it says on the can. Ideal quick calculator without getting bogged down with complicated charts. Another reviewer commented that you’d have to know exactly what you’re doing to use this app.......I should hope so, you want non gas registered people installing your gas supply pipe work????? ### 5/5 — Very good *2014-11-12* Fast and easy to use on site. Excellent ## Most praised reviews (4 highest-rated) ### 5/5 — Very clear app. easy to use. *2013-11-10* Purchased this to help with sizing and it is brilliantly simple. Good app. ### 5/5 — Amazing best app on here *2013-01-03* Amazing dose what any gas man wants mr combi wins me over !! ### 5/5 — Very easy to use *2012-12-12* Very quick and easy, accurate enough an who needs more than 35mm? More than adequate for normal domestic installs ### 5/5 — Gas pipe size *2012-12-03* Worth the money very easy to use --- *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 2026-09-07.*