To calculate CFH from BTU, identify the BTU number, then utilize the equation by multiplying the BTU number by the appropriate factor. The process takes about 5 minutes and requires access to a calculator.

**Identify the BTU number**Find the British Thermal Unit number that needs to be converted.

**Utilize the conversion equation**Calculate the conversion by placing the BTU number in the conversion equation. The equation explains that one cubic foot per hour, or CFH, is equal to 1,000 BTU of natural gas or 2,500 BTU of liquid propane when exposed to the environment.

**Multiply the BTU number by the correct factor**Multiply the BTU number that needs to be converted by the correct factor from the equation, depending on whether natural gas or liquid propane is being used.