Gas-Meter Clocking (Actual Firing Rate)
The actual firing rate of a gas appliance by clocking the meter: from the seconds for one revolution of a known test dial, the dial size, and the fuel heating value (default 1030 BTU/cf natural gas, ~2500 LP), the gas flow in cfh and the input in BTU/hr, with a firing-on-rate / overfired / underfired verdict against the nameplate. Clock with every other gas appliance off.
Formula and source
cfh = (3600 / seconds-per-rev) x dial size; actual input (BTU/hr) = cfh x heating value. Verdict compares the clocked rate to the nameplate within 5%.
First-principles meter-clocking arithmetic (public); the heating value is an editable field.
Audience
This tile is built for hvac and the adjacent professions in the HVAC group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.
Related tiles
Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.