Simulator
BTU Calculator
Define the room size
You can also type the exact value in each field
Select the sunlight exposure level
Sunlight changes the base BTU requirement per m²
Define people, windows and equipment
You can also type the exact value in each field
Recommended capacity
0 BTUs
- Room area
- 0 m²
- Sunlight level
- Partial sunlight
- Calculated load
- 0 BTUs
* This simulation is approximate. It uses 600, 700 or 800 BTUs per m² depending on sunlight exposure, then adds 600 BTUs for each person, television, computer, window and other equipment, plus 150 BTUs for each light. It does not replace a technical assessment of insulation, ceiling height, climate or installation conditions.
BTU Calculator
Enter the room details to estimate the recommended air conditioner capacity. The result is approximate and helps you choose a more suitable power rating before purchasing.
Calculate BTUs
One of the most important steps when buying an air conditioner is estimating the cooling capacity required for the room where the unit will be installed. A better estimate helps you avoid choosing an undersized unit that struggles to cool the space or an oversized unit that may waste energy.
What are BTUs?
BTU means British Thermal Unit. Technically, it is a unit of heat energy. In air conditioning, the term is commonly used to refer to BTU per hour, or BTU/h, which indicates how much heat the equipment can remove from a room in one hour. The higher the BTU rating, the greater the cooling capacity.
How does this calculator estimate BTUs?
This calculator uses a practical rule of thumb: the room area is multiplied by the sunlight level, then internal heat loads such as people, windows, lights and equipment are added. The final result is rounded up to a common commercial air conditioner capacity.
- No direct sunlight: 600 BTUs per m².
- Partial sunlight: 700 BTUs per m².
- Direct sunlight: 800 BTUs per m².
- Additional loads: people, windows and equipment are added individually.
Other factors to consider
Insulation, ceiling height, room orientation, local climate and heat-generating appliances can change the ideal capacity. For a precise recommendation, Eco Climatização recommends an assessment by a qualified technician.
