BTU Calculator | Calculate the perfect air-conditioner size
- Tony M
- May 1
- 1 min read

To find the appropriate size air conditioner for your room, you should calculate the necessary BTU (British Thermal Units) capacity according to the room's square footage. Typically, you can multiply the room's area (length x width) by 20-25 BTUs per square foot. Nonetheless, additional factors such as ceiling height, insulation, and the number of occupants can also affect this calculation.
Here's a more detailed breakdown:
1. Measure the Room:
Length: Measure the length of the room in feet or meters.
Width: Measure the width of the room in feet or meters.
2. Calculate the Area:
Square Footage: Multiply the length by the width. This gives you the area of the room in square feet.
Square Meters: If you're using meters, the area will be in square meters.
3. Estimate BTU Requirements:
Rule of Thumb: A common guideline is to multiply the square footage by 20-25 BTUs.
Example: If your room is 10 feet wide and 15 feet long (150 square feet), you'd need approximately 3,000-3,750 BTUs (150 x 20-25).
Consider Other Factors: If your ceiling is high, the room has a lot of windows, or there are many people in the room, you may need a slightly larger unit.
4. Choose the Right Unit:
Rounding Up:
Always round up to the nearest available BTU capacity to ensure adequate cooling.
Consider Other Options:
If you're unsure, consult with a professional for a more accurate assessment.
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