Who is this for?
Gas engineers, heating engineers and anyone commissioning or servicing gas appliances who needs to confirm an appliance is firing at its rated input.
Field & Mobile
Gas rate calculated on the phone, not on the back of a job sheet
Gas rating an appliance means timing the meter and doing arithmetic in a cupboard with a torch. Gaffer's calculator does the sum on your phone, so the figure that goes on the certificate is calculated rather than estimated.
No credit card required · One platform · Web & Android (iOS coming soon)
How the gas rate calculator works in Gaffer
Enter the meter reading interval and the calculator returns the rate.
Built into the app
It is in the mobile app you already have on the job, so there is no separate calculator app or paper conversion chart to find.
Feeds the paperwork
The gas rate is recorded alongside combustion readings, so the figure that reaches the certificate is the one that was calculated.
Works offline
Meter cupboards and plant rooms have no signal. The calculator runs on the device, so it works regardless.
What you get
The gas rate calculator sits with combustion readings, gas safety certificates and your trade pack in one platform.
- Gas rate in kW calculated from a timed meter reading
- Available in the mobile app on site
- Works offline in meter cupboards and plant rooms
- Result recorded alongside combustion readings
- Feeds gas safety certificates and service records
- Part of the gas engineer and heating trade packs
- No separate app or conversion chart needed
Common questions about gas rate calculator
Does it replace my analyser?
No. It calculates gas rate from a timed meter reading — a different measurement from the flue gas analysis your analyser performs. Gaffer records combustion readings separately, including from analysers that report device make and serial.
Is the calculated figure stored?
Gas rate is held on the combustion reading record alongside CO, CO2, O2, flue temperature and efficiency, so it forms part of the job's technical record rather than being a throwaway calculation.
Does it work without signal?
Yes. It runs on the device, which matters because meter locations are consistently the worst place in any building for reception.
Put the calculator in your pocket
14 days free. Full access. No card needed.