Free tool
Gas rate calculator
Heat input in kW from a timed meter test — metric or imperial. It shows its working, so you can check it against the appliance data plate.
Runs entirely on your phone. Nothing is sent anywhere, and there is no email to give.
Meter type
How did you measure it?
Other free tools
CP12 generator
A complete Landlord Gas Safety Record as a PDF, covering every gas appliance type.
5 minutes · emailed to you
Boiler service record
A gas appliance service record you can hand over or email the same day.
3 minutes · emailed to you
Doing more than one of these a month?
These tools keep nothing — every certificate starts from a blank form, and we cannot re-send one you have lost. An account remembers your details and your customers, keeps every certificate you issue, and gives each one a link you can send to the landlord.