GB Gas Rate Calculator Downloads & RevenueGB Gas Rate Calculator · App Store
Not in any tracked top chart right now.
Updated 7 Nov 2026 · rankings refresh through the day
DeveloperGB-GAS.CO.UK
CategoryBusiness
PriceFree
Released
Rating★ 5.0 (2)
Version12
Age rating4+
First seen by us
23 Oct 2026
23 Oct 2026GB Gas Rate Calculator update history & changes
Last change · 3 events since 4 Feb 2013Full timeline ↓Full timeline · 3 events
- 🆕GB Gas Rate Calculator first spotted by AppInsiderUnited Kingdom (found via developer)
- 📦GB Gas Rate Calculator version 12A major update to GB-GAS Gas Rate & Heat Input.
This version introduces our new camera-assisted gas-rating system alongside the existing manual calculator.
New in this version:
• New Metric OCR meter-reading system
• New Imperial meter dial tracking
• Automatic calculation from camera-monitored meter movement
• Improved reading verification and visual test feedback
• High-fire and low-fire testing sequence where applicable
• Improved manufacturer information and result comparison
• Updated manual calculator and stopwatch operation
• Gas Rate displayed in m³/hr
• Net and Gross Heat Input displayed in kW
• Improved results confirmation and reporting
• Updated camera controls and meter alignment guides
• Refreshed interface throughout the app
• Updated GB-GAS splash-screen system
• One-time Remove Adverts option added
• Restore Purchases support
This is one of the biggest updates to the GB-GAS Gas Rate & Heat Input Calculator, combining traditional manual gas rating with new camera-assisted methods in a single app.
V12 update to marketing URL… more - 🆕GB Gas Rate Calculator released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
5.0 ★
2 ratings
Measured
GB Gas Rate Calculator on the App Store
App details
App ID
597689171
Publisher
George A Brown
On the store since
Feb 2013
13 years on the store
Minimum OS
iOS 26.0+
iPhone 11 and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
1
EN
Size
7 MB
Also listed in
Education
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
5.0 ★
2 ratings
Measured
Ratings
2
Measured
About GB Gas Rate Calculator
GB-GAS Gas Rate & Heat Input Calculator
A practical gas rate and heat input calculator designed for gas engineers, trainees and students.
The app provides both traditional manual gas-rate calculations and camera-assisted OCR methods, allowing you to choose the most appropriate method for the meter you're working with.
CAMERA-ASSISTED GAS RATING
The app includes dedicated systems for both Metric and Imperial gas meters.
Metric OCR uses the iPhone or IPad camera to monitor changes in the meter index and calculate the gas rate from the measured gas consumption and elapsed time.
Imperial Meter Tracking uses the camera to monitor the movement of the meter test dial and calculate the gas rate without manually operating a stopwatch.
The app guides you through the test and provides visual feedback as readings are collected and verified.
MANUAL GAS RATE CALCULATOR
Prefer the traditional method? The full manual calculator remains available.
Enter meter readings and use the built-in stopwatch to calculate the gas rate using the actual measured test duration.
Results include:
• Gas Rate in m³/hr
• Net Heat Input in kW
• Gross Heat Input in kW
Natural Gas and LPG calculations are supported where applicable.
HIGH AND LOW FIRE TESTING
Where manufacturer information includes both high-fire and low-fire values, the app guides you through both tests in sequence and allows the results to be compared with the appliance information.
MANUFACTURER INFORMATION
Enter appliance manufacturer data before testing to provide a useful comparison between the measured result and the expected appliance input.
Manufacturer information can also be skipped when a straightforward gas-rate calculation is required.
RESULTS AND REPORTING
Completed tests can be reviewed and a report produced for saving, printing or sharing.
FREE TO USE
The app is supported by advertising.
A one-time Remove Adverts purchase is available for users who prefer an advertising-free experience. The purchase can be restored on compatible devices using the same Apple Account.
GB-GAS tools are designed to assist engineers and students with everyday calculations. Results should always be considered alongside current industry procedures, appliance manufacturer instructions and applicable regulations
A practical gas rate and heat input calculator designed for gas engineers, trainees and students.
The app provides both traditional manual gas-rate calculations and camera-assisted OCR methods, allowing you to choose the most appropriate method for the meter you're working with.
CAMERA-ASSISTED GAS RATING
The app includes dedicated systems for both Metric and Imperial gas meters.
Metric OCR uses the iPhone or IPad camera to monitor changes in the meter index and calculate the gas rate from the measured gas consumption and elapsed time.
Imperial Meter Tracking uses the camera to monitor the movement of the meter test dial and calculate the gas rate without manually operating a stopwatch.
The app guides you through the test and provides visual feedback as readings are collected and verified.
MANUAL GAS RATE CALCULATOR
Prefer the traditional method? The full manual calculator remains available.
Enter meter readings and use the built-in stopwatch to calculate the gas rate using the actual measured test duration.
Results include:
• Gas Rate in m³/hr
• Net Heat Input in kW
• Gross Heat Input in kW
Natural Gas and LPG calculations are supported where applicable.
HIGH AND LOW FIRE TESTING
Where manufacturer information includes both high-fire and low-fire values, the app guides you through both tests in sequence and allows the results to be compared with the appliance information.
MANUFACTURER INFORMATION
Enter appliance manufacturer data before testing to provide a useful comparison between the measured result and the expected appliance input.
Manufacturer information can also be skipped when a straightforward gas-rate calculation is required.
RESULTS AND REPORTING
Completed tests can be reviewed and a report produced for saving, printing or sharing.
FREE TO USE
The app is supported by advertising.
A one-time Remove Adverts purchase is available for users who prefer an advertising-free experience. The purchase can be restored on compatible devices using the same Apple Account.
GB-GAS tools are designed to assist engineers and students with everyday calculations. Results should always be considered alongside current industry procedures, appliance manufacturer instructions and applicable regulations
Latest updates
12
A major update to GB-GAS Gas Rate & Heat Input.
This version introduces our new camera-assisted gas-rating system alongside the existing manual calculator.
New in this version:
• New Metric OCR meter-reading system
• New Imperial meter dial tracking
• Automatic calculation from camera-monitored meter movement
• Improved reading verification and visual test feedback
• High-fire and low-fire testing sequence where applicable
• Improved manufacturer information and result comparison
• Updated manual calculator and stopwatch operation
• Gas Rate displayed in m³/hr
• Net and Gross Heat Input displayed in kW
• Improved results confirmation and reporting
• Updated camera controls and meter alignment guides
• Refreshed interface throughout the app
• Updated GB-GAS splash-screen system
• One-time Remove Adverts option added
• Restore Purchases support
This is one of the biggest updates to the GB-GAS Gas Rate & Heat Input Calculator, combining traditional manual gas rating with new camera-assisted methods in a single app.
V12 update to marketing URL
