Gas Meter Clocking Calculator

Time one revolution of the test dial with only the appliance running.

HVAC Pro calculator — inputs, formula and example are open to everyone.

Result

Results for this calculator are part of HVAC Pro

You can see the inputs, formula and worked example. Unlock results for every Pro calculator.

Unlock with HVAC Pro

Already a member? Sign in

Formula

ft³/h = dial size × 3600 ÷ seconds
BTU/h = ft³/h × heating value

Example calculation

1 ft³ dial in 45 s → 80 ft³/h → 82,400 BTU/h at 1,030.

Practical HVAC use

Verify firing rate against the rating plate.

Common mistakes

Other gas appliances running during the test.

Related calculators

Gas Consumption

Pro

Estimate natural gas use in ft³, m³ and therms plus cost from appliance input, run hours and heating value.

Furnace Output BTU

Pro

Calculate furnace heat output in BTU/h and kW from input rating and efficiency.

Educational tool. Results are estimates from the stated formulas; always confirm with manufacturer data and the code adopted in your jurisdiction. All calculators