# GB Gas Rate Calculator — 2026 Version

> Heat input and gas rate calculator for natural gas installations. (iPhone/iPad app by GB-GAS.CO.UK.)

- Source: https://appshunter.io/ios/app/gb-gas-rate-calculator/id597689171 (this page in markdown: same URL + `.md`)
- Developer: [GB-GAS.CO.UK](https://appshunter.io/developer/425897007)
- Category: Business, Education
- Price: $4.99
- Age rating: 4+
- Requires: iOS 16.6 · 2 MB
- Languages: American English
- Released: 2013-02-04
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/gb-gas-rate-calculator/id597689171/reviews.md

## What is GB Gas Rate Calculator?

GB-GAS Gas Rate Calculator No Adverts

The professional gas rate and heat input calculator designed specifically for qualified gas engineers, heating engineers, commissioning engineers, service engineers, trainers, assessors and apprentices.

Developed by GB-GAS using many years of practical industry experience, this professional application provides a fast, accurate and easy-to-use method of calculating appliance gas rates and heat inputs while producing clear commissioning results.

Whether you are carrying out routine servicing, commissioning a new installation, fault finding or checking appliance performance, GB-GAS Heat Input Calculator Professional guides you through every stage of the testing process.

Unlike simple gas rate calculators, this application provides a structured commissioning workflow that mirrors the way professional engineers work on site.

Professional Features

• Accurate gas rate calculations

• Net and Gross Heat Input calculations

• Suitable for Natural Gas and LPG installations

• Manufacturer data entry

• Automatic comparison of measured results against manufacturer specifications

• Automatic tolerance calculations

• High Fire and Low Fire testing

• Cooker Grill and Oven testing

• Large professional stopwatch

• Test duration quality assessment

• Professional commissioning summary

• PDF report generation

• Print, Share and Save to Photos

• Clean step-by-step workflow

• Designed specifically for field use

• No adverts

• No subscriptions

Simple Step-by-Step Workflow

The application guides the engineer through each stage of the commissioning process.

Step 1

Select the appliance type.

Choose from:

• Boiler

• Cooker

• Other Gas Appliance

The application automatically configures the correct testing sequence.

Step 2

Enter the manufacturer information.

Input manufacturer values using:

• Net Heat Input

• Gross Heat Input

or

• Gas Rate

Manufacturer information can be entered before testing or skipped if not available.

Step 3

Carry out the gas rate test.

The large digital stopwatch makes timing easy to read even in poor lighting conditions.

Results are automatically calculated for:

• Gas Rate

• Net Heat Input

• Gross Heat Input

Before accepting each test the application allows you to confirm the result or immediately restart the timing process if required.

Intelligent Commissioning

Once testing has been completed the application automatically compares your measured values with the manufacturer's data.

Results are displayed clearly showing:

Manufacturer Value

Measured Value

Percentage Difference

Pass or Fail indication

Acceptable commissioning tolerance

This provides immediate confirmation that the appliance is operating within expected performance limits.

High Fire and Low Fire Testing

For boilers the application automatically guides you through:

Reports provide a clear record of the commissioning results and measured appliance performance.

Why Choose GB-GAS?

GB-GAS has been producing professional gas engineering training materials, technical publications and engineering software for many years.

Every feature within this application has been developed using real-world engineering experience to provide a workflow that is practical, accurate and simple to use.

Rather than simply providing a calculation, GB-GAS Heat Input Calculator Professional helps engineers complete a structured commissioning process from start to finish.

Time the Metric meter for two minutes, input the first and second reading, press calculate and your answer is there.
For imperial meters time one revolution then convert the time into seconds. input that time, press calculate and your answer is there.
No more looking up charts or using long winded calculations... Its so simple

## Key features

- Heat input calculation
- Gas rate calculation
- Adjustable calorific value
- Metric meter timing
- Imperial meter conversion
- Simplified calculations

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/gb-gas-rate-calculator/id597689171/reviews.md

### 2/5 — Cannot read numbers if your iPhone is in dark screen mode

*2021-09-24*

Cannot read numbers if your iPhone is in dark screen mode have to change iPhones settings/ display to light appearance

### 2/5 — Shuts down

*2019-02-24*

App won't stay open won't to shut down after 30 secs. You have to touch screen it to prevent this. Soo annoying.

## Frequently asked questions about GB Gas Rate Calculator

### What is the GB Gas Rate Calculator used for?

The GB Gas Rate Calculator is used to simplify the process of calculating heat input and gas rates for natural gas installations. It helps professionals quickly determine these values without needing to consult charts or perform complex manual calculations.

### Does the GB Gas Rate Calculator have ads?

No, the GB Gas Rate Calculator does not contain advertisements. It is a paid application that provides a clean and uninterrupted user experience for its intended purpose.

### What devices does the GB Gas Rate Calculator support?

The GB Gas Rate Calculator is available for iPhone and iPad devices. It is designed to function on Apple's mobile operating systems.

### How often is the GB Gas Rate Calculator updated?

The GB Gas Rate Calculator was last updated on July 25, 2020, with version 6. While updates may not be frequent, the app is designed for a specific utility function that generally requires stability.

### What is the age rating for the GB Gas Rate Calculator?

The GB Gas Rate Calculator has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions.

### Can I adjust the calorific value with the GB Gas Rate Calculator?

Yes, this version of the GB Gas Rate Calculator allows you to change the calorific value of the gas. This feature provides greater flexibility for different gas compositions.

### How does the GB Gas Rate Calculator handle timing for metric meters?

For metric meters, you can time for two minutes and input the readings, or use shorter times for quicker calculations. Longer timing periods can lead to more accurate results.

### What is the price of the GB Gas Rate Calculator?

The GB Gas Rate Calculator is a paid application priced at $1.99. This one-time purchase grants access to all its features.

## Version history (last 5 releases)

### 9 — 2026-08-18

Minor changes to the UI and formula to make gas rates more accurate. No need to wait for two minutes to get an answer for metric calculations,

### 8 — 2026-08-11

This version has the ability to take high and low fire information, compare with the manufacturers data and give conclusions on performance.

### 6 — 2020-07-25

IOS Change Updates and Added code to stop the screen closing down while waiting for the timer.

### 5 — 2017-08-01

Updates for new IOS

### 3 — 2014-01-16

stopwatch works to 1/100th of a second this increases the accuracy of the calculation, and avoids having to wait for two mins on a metric meter. This allows the user to decide how long to time a meter for remembering the longer the time the better the accuracy and two mins is recommended.

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## More apps by GB-GAS.CO.UK

- [GB Gas Heat Input Calculator](https://appshunter.io/ios/app/gb-gas-heat-input-calculator/id426032737)
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- [GB Gas Tightness NG + LPG](https://appshunter.io/ios/app/gb-gas-tightness-ng-plus-lpg/id430236121)

All apps by GB-GAS.CO.UK: https://appshunter.io/developer/425897007

## Related topics

[gas rate calculator](https://appshunter.io/ios/topics/gas-rate-calculator)

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*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 2026-08-24.*