AC BTU Calculator
Estimate the cooling needs of any space with our advanced BTU calculator. Find the perfect air conditioner size for your room or entire house.
Room Cooling Calculator
What is BTU?
BTU (British Thermal Unit) is a unit of heat defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.
In air conditioning, BTU measures how much heat an AC unit can remove from a room per hour.
Sizing Guide
100-300 sq ft: 5,000-7,000 BTU
300-500 sq ft: 8,000-12,000 BTU
500-800 sq ft: 14,000-18,000 BTU
800-1,200 sq ft: 21,000-25,000 BTU
1,200-1,500 sq ft: 28,000-30,000 BTU
Important Considerations
• Add 10% for sunny rooms
• Add 600 BTU per additional person
• Add 4,000 BTU for kitchen spaces
• High ceilings require more capacity
Cooling Requirements
Required BTU
Recommended AC Size
Room Area
Energy Efficient
Our calculator helps you choose the right-sized unit to maximize energy efficiency and reduce electricity costs.
Any Space
Calculate BTU requirements for bedrooms, living rooms, kitchens, offices, or entire houses.
Fully Responsive
Use our calculator on any device – smartphones, tablets, laptops, or desktops.