Gas Flow Rate Calculator
The essential tool for UK gas engineers. Calculate heat input from any gas appliance in seconds — imperial or metric meter.
The essential tool for UK gas engineers. Calculate heat input from any gas appliance in seconds — imperial or metric meter.
Supports both U6 dial meters (time one revolution) and E6 meters (2-minute reading difference).
Enter your reading and see gross & net values in kW, BTU/hr, ft³/hr, m³/hr and litres/hr immediately.
Natural Gas, Propane and Butane — each with the correct CV and gross-to-net ratio built in.
Choose ¼, 1, 2 or 5 ft³/rev to match the test dial on your imperial meter.
Log readings from multiple appliances on the same job. History is stored locally — no account needed.
All calculations run on-device. No sign-in, no analytics, no network requests of any kind.
Choose Natural Gas, Propane or Butane.
Imperial (U6) or Metric (E6) — select the matching tab.
Time one revolution, or record two meter readings 2 minutes apart.
Gross & net heat input in every unit, instantly.
Time one complete revolution of the test dial in seconds. Supports ¼, 1, 2 and 5 ft³/rev dial sizes. Uses the standard 1097 ÷ t formula scaled for dial size.
Record the meter reading, wait exactly 2 minutes, then record again. The app calculates consumption and converts to heat input using the standard × 30 × 10.72 formula.