This HVAC BTU calculator estimates the cooling capacity required for a room based on area, number of occupants and glass exposure.
Room Load = Area × 60 BTU
People Load = Number of People × 600 BTU
Glass Load = Glass Area × 150 BTU
Total BTU = Room Load + People Load + Glass Load
AC Capacity (Ton) = BTU ÷ 12,000
Room Area = 300 sq.ft
People = 4
Glass Area = 30 sq.ft
Cooling Load ≈ 22,500 BTU
Required AC ≈ 1.9 Ton
BTU (British Thermal Unit) measures the cooling capacity of an air conditioner. Higher BTU means stronger cooling capacity.
Generally 20–30 BTU per sq ft is used for residential cooling load estimation.
1 Ton of refrigeration = 12,000 BTU per hour.
A 200 sq ft room usually requires around 12,000–15,000 BTU depending on heat load.