# GB Gas Pipe Sizing Calculator — user reviews

> 16 indexed App Store user reviews of GB Gas Pipe Sizing Calculator by GB-GAS.CO.UK.

- Source: https://appshunter.io/ios/app/gb-gas-pipe-sizing-calculator/id427457719/reviews
- App overview in markdown: https://appshunter.io/ios/app/gb-gas-pipe-sizing-calculator/id427457719.md

## Most critical reviews (10 lowest-rated)

### 1/5 — Not a pipe size calculator !! CRAP

*2018-10-31*

This app does not tell you what size pipe is required for each branch. Not eorth buying it, i regretted buying it 5 minutes later !!!

### 1/5 — Gas pipe App

*2018-05-10*

Do not bother!!! Rubbish.

### 1/5 — Poo avoid !! Rip off !! :(

*2013-01-03*

Avoid u have to put all info in your self

### 1/5 — Pipe sizing

*2012-01-01*

This app  don't work for pipe sizes above 22 mm for the 1st run and the answers are all out by 0.3 mbars

### 1/5 — Needs pipe sizes sorting!

*2011-06-14*

Great app if your only sizing upto 22mm. All other bigger pipes give same as 22mm. And would be better if you could put KW instead of m3/h. Come on sort it out!

### 2/5 — Gas pipe size calculator

*2013-08-28*

After paying £5 for this app I was hoping it would be more advanced then the cheaper ones . 
It would nice to see an app which tells you how much of each size copper pipe can be used at each section before being able to reduce down ie 5m of 28mm copper and then 10m of 22mm whilst adding bends, elbows tees etc. 
perhaps the ability to add appliances kw ratings as well . 
Thanks

### 2/5 — Ok for small installations!!

*2012-04-16*

This is only a good app if you aren't doing a u16 meter, and would be greatly improved if you could input the kw of the appliance, especially considering the price. Apart from that it's very easy to use

### 2/5 — Not great

*2012-01-31*

Would be better if you could just type what flow you need and then it tells you min pipe size

### 3/5 — Expensive

*2011-09-26*

This is needs improving. It should go up to 54mm and the appliances should be in KWs. It should include U16 meter options. Good for version 1. Hurry up and get the update out.

### 3/5 — Gas pipe sizing

*2011-05-18*

Have tried this with an actual boiler install and a cooker hob on the end of the run, and didn't find it that accurate. It clearly said the pressure drop was to great, yet if I cross referred it to known tables it gave a different answer. Also it gave the same answer for a given input with two different pipe sizes.

## Most praised reviews (6 highest-rated)

### 5/5 — Good app

*2019-03-18*

If your a total mong then you’ll struggle with this app, if you can spell your name then it’s actually a really decent app.

### 4/5 — Good little app

*2014-02-02*

This is a good little app for checking gas pipe sizing. It confirmed I had an undersized gas pipe and meter. It was easy to change the sizing and do a recheck. Results can be stored as a picture and printed out.

### 4/5 — Gas Man

*2012-06-04*

Good app which basically does what it says, would be great to have non domestic pipe sizes added as it would really save time when on commercial gas jobs, would happily recommend.

### 4/5 — Good app

*2011-05-14*

Played with app and it is straight forward, just the thing when I'm on a quote and need to re assure customer that the extra pipe up sizing work is actually required.

### 4/5 — Pipe sizing

*2011-04-30*

Have not used it for an actual job yet but having played about with it, seems excellent.
I have my ACS reassessment in a couple of weeks, so it should get a bit of use then, main reason for getting it Really !

### 4/5 — Pipe size

*2011-04-21*

Seems to work well but in my opinion after a sizing an installation I would say it tends to be a bit oversized but none the less a good and useful app 4 of 5 for me

---

*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 2026-09-04.*