Free Calculators for Tradesmen
Quick, accurate on-site calculators. No app to install. Referenced to the standards you actually work to: Gas Safe technical bulletins and the relevant British Standards.
Gas
Gas Rate Calculator
Convert meter readings to m³/hr and kW for natural gas or LPG.
Gas
Flue-Gas Ratio Checker
Get the CO/CO₂ combustion ratio and its BS 7967 action band.
GasBeta
Gas Pipe Sizing Calculator
Size a whole installation against BS 6891:2015, section by section.
RefrigerationBeta
F-Gas Leak Check Calculator
Turn a refrigerant charge into tonnes CO₂e and the leak-check interval you owe.
Reference
UK Refrigerant Reference
GWP, safety class and UK F-Gas status for every common refrigerant.
Tool
Refrigerant Replacement Finder
The compliant lower-GWP swap for R-410A, R-404A, R-22 and more, with the GWP drop.
Reference
UK F-Gas Phase-Down Timeline
The ban dates that decide what you can fit and service, and where GB diverges from the EU.
More calculators coming. Browse certificates while you're here.