BTU Cooling Calculator
Calculate required air conditioner BTU and tonnage based on room area and type. Helps you choose the right AC size to avoid wasting energy or under-cooling your space — instant, accurate results.
📊 Result Chart
About the BTU Cooling Calculator
This free online BTU cooling calculator helps you determine the right air conditioning capacity for your room. By entering the room area and ceiling height, you get the required BTU (British Thermal Units) and the recommended AC horsepower, making it easy to choose the perfect air conditioner.
BTU Cooling Calculator in 3 steps
- Enter the floor area of your room in square meters (e.g. 25 for a 25 m² room).
- Enter the ceiling height in meters (standard height is typically 2.8 m).
- Click Calculate to see the room volume, required BTU, and recommended AC horsepower.
What is BTU?
BTU (British Thermal Unit) is a unit of heat energy. In air conditioning, it measures the cooling capacity needed for a room. One BTU is the energy required to heat or cool one pound of water by one degree Fahrenheit.
How much BTU do I need per square meter?
A general rule is approximately 136 BTU per cubic meter of room volume. For a typical room with 2.8 m ceiling height, that translates to about 380 BTU per square meter of floor area.
What AC horsepower (HP) do I need?
Divide the BTU by 12,000 to get the approximate horsepower. For example, 12,000 BTU equals 1 HP, suitable for a room of about 30-35 m² with standard ceiling height.
Does this calculator work for any room type?
This calculator provides a general estimate based on room volume. For rooms with high sun exposure, poor insulation, or heat-generating equipment, you may need 20-30% more cooling capacity.