Btu versus BTU/h
Btu is an energy quantity. BTU/h is a heat-transfer rate, which is why it appears on HVAC capacity labels.
Core conversion formulas
W = BTU/h × 0.29307107
kW = BTU/h ÷ 3,412.141633
RT = BTU/h ÷ 12,000
kW = BTU/h ÷ 3,412.141633
RT = BTU/h ÷ 12,000
These formulas convert units of rate. They do not calculate a building’s heating or cooling load.
Example
A 24,000 BTU/h rating is 2 refrigeration tons and about 7.03 kW of thermal capacity.
Use the formula without manual arithmetic
Enter a capacity rating and compare the result in the unit you need.
BTU CalculatorFAQ
Does BTU/h equal electrical watts?
No. BTU/h capacity and electrical input are not interchangeable equipment ratings.
Why use refrigeration tons?
Tons provide a concise HVAC capacity shorthand: 1 RT equals 12,000 BTU/h.