Gas Flow Rate Calculator
For Gas Engineers & Plumbers
£0.99 · Designed for iPad. Not verified for macOS.
Time the test dial, enter the seconds — get gross and net heat input in kW, BTU, and cubic metres instantly. Covers U6, E6, natural gas, propane, and butane.
Time the test dial. Enter the seconds. Get the answer.
Gas Rate Calculator gives you gross and net heat input in every unit a UK gas engineer needs — kW, BTU/hr, ft³/hr, m³/hr, and l/hr. Covers U6 and E6 meters, natural gas, propane, and butane.
HOW IT WORKS
Time one complete revolution of the test dial on the meter, enter the reading, and the app instantly calculates gross and net heat input. Supports both imperial (U6) and metric (E6) dial meters.
IMPERIAL (U6) METER
Select your dial size (1/4, 1, 2 or 5 ft3/rev), enter the time in seconds for one complete revolution, and read off the results. The classic method used every day on service calls.
METRIC (E6) METER
Record the meter reading, wait exactly 2 minutes, record again. The app calculates consumption over that period and converts to heat input. No stopwatch needed for the test dial.
RESULTS IN EVERY UNIT
Each calculation gives you both gross and net values for:
- kW
- BTU/hr
- Cubic feet per hour
- Cubic metres per hour
- Litres per hour
THREE GAS TYPES
- Natural Gas (CV 38.76 MJ/m3, gross/net ratio 1.11)
- Propane (CV 93.1 MJ/m3, gross/net ratio 1.09)
- Butane (CV 121.8 MJ/m3, gross/net ratio 1.08)
SAVE AND COMPARE
Name and save as many calculations as you like. Useful for logging readings across multiple appliances on the same job, or comparing before and after a service. History is stored locally and persists between sessions.
NO SIGN-IN. NO ADS. NO DATA COLLECTED.
All calculations run entirely on your device. Nothing is sent to any server.
Built for iPhone. iOS 17 or later required.
Ratings & Reviews
Completely rebuilt as a fully native iOS app — faster, lighter, and built for the latest iPhones.
Please note: calculations saved in previous versions are not carried over by this update. If you need any saved results, note them down before updating.
The developer, Plan CD, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Rik Watson
- Size
- 1.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Rik Watson
