HVAC BTU Calculator
A rough cooling load from the floor area.
A rough guide of about 430 BTU per square metre. Have a technician size the real system.
BTU/h
17,200
kW
5.04
Worked example
A 40 m² room at about 430 BTU per square metre needs about 17,200 BTU/h, which is about 5.04 kW. That is a rough screen, not a heat load.
FAQ
- Where does 430 BTU per square metre come from?
- It is a rule of thumb from about 40 BTU per square foot. Real loads depend on glass, insulation, and climate.
- How do you convert BTU/h to kW?
- Divide by 3,412.
- Can I size a unit from this alone?
- No. Use it to get in the right range, then have the system sized properly.