Gas rate calculator
Clock the meter, type the readings and get the gas rate and heat input in kW gross and net. Compare it with the data plate in the same place.
Heat input
-kW gross
- Heat input, net-
- Gas rate-
- Against the data plate-
Type two meter readings, or the seconds for one revolution of the test dial.
How it is worked out
Gas rate from a metric meter: (second reading − first reading) × 3600 ÷ seconds in m³/h. From an imperial test dial: dial size × 3600 ÷ seconds in ft³/h, then × 0.0283 for m³/h.
Heat input: m³/h × calorific value ÷ 3.6 gives kW gross. Net is gross ÷ 1.11 for natural gas.
Good to know
Natural gas only. The calorific value varies by area and day; 39.5 MJ/m³ is a typical figure, and you can change it.
Run only the appliance being tested, at full rate, with everything else off. Check the result against the manufacturer’s instructions and the tolerance they give. This calculator helps with the arithmetic; the assessment is yours.
Everything is calculated in your browser. Nothing you type is sent or stored.
In Tickzu, readings, records, reminders and invoices sit with the customer and the appliance, ready for next year.
See Tickzu