BTU Calculator for Air Conditioner

Calculate the required BTU and cooling capacity for your air conditioner based on room size, insulation, sun exposure, and climate. Get accurate AC sizing recommendations.

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The length of the room you want to cool. Accurate measurements ensure proper AC sizing to avoid under-cooling or energy waste.
meters
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The width of the room you want to cool. Combined with length, this determines the total floor area that needs cooling.
meters
?
The height from floor to ceiling. Higher ceilings increase the volume of air that needs to be cooled, requiring more BTU capacity.
meters
?
The quality of your room's insulation affects heat retention and cooling efficiency. Poor insulation requires more cooling power to maintain temperature.
?
How much direct sunlight the room receives throughout the day. More sun exposure significantly increases heat gain and cooling requirements.
?
The typical number of people in the room. Each person generates about 400 BTU of body heat, increasing cooling requirements.
people
?
Your local climate affects outdoor temperature and humidity levels. Hotter climates require higher cooling capacity for comfort.
?
How many hours per day you plan to run the air conditioner. This helps estimate your energy consumption and operating costs.
hours
?
Your local electricity cost per kilowatt-hour. This rate is used to calculate your estimated monthly and yearly cooling costs.
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Results
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Required BTU
The minimum British Thermal Units per hour needed to effectively cool your room based on all factors. This is the baseline cooling capacity your air conditioner should provide.
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Required Cooling Power
The cooling capacity expressed in kilowatts, which is commonly used in many countries. This helps you compare AC models using metric specifications.
Recommended AC Capacity
The suggested air conditioner size with a safety margin included. It's typically 10-20% higher than the minimum to account for extreme conditions and ensure comfortable cooling.
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Estimated Monthly Cost
Your projected electricity cost per month based on daily usage hours and your local electricity rate. Actual costs may vary with temperature settings and usage patterns.
—
Estimated Yearly Cost
Your projected annual electricity cost for running the air conditioner. This helps you budget for cooling expenses and compare the operating costs of different AC models.
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BTU Calculator for Air Conditioner

This BTU calculator helps you determine the correct air conditioner size for your room based on dimensions, insulation, sun exposure, occupancy, and climate. Choosing the right BTU capacity ensures efficient cooling, optimal comfort, and lower energy bills. An undersized unit won't cool effectively, while an oversized unit cycles on and off frequently, wasting energy and reducing humidity control. Use these results to select an air conditioner that matches your specific needs and saves money on operating costs.

Input Parameters Explained

Parameter
Description
Room Length
The length of the room you want to cool. Accurate measurements ensure proper AC sizing to avoid under-cooling or energy waste.
Room Width
The width of the room you want to cool. Combined with length, this determines the total floor area that needs cooling.
Ceiling Height
The height from floor to ceiling. Higher ceilings increase the volume of air that needs to be cooled, requiring more BTU capacity.
Insulation Quality
The quality of your room's insulation affects heat retention and cooling efficiency. Poor insulation requires more cooling power to maintain temperature.
Sun Exposure
How much direct sunlight the room receives throughout the day. More sun exposure significantly increases heat gain and cooling requirements.
Number of Occupants
The typical number of people in the room. Each person generates about 400 BTU of body heat, increasing cooling requirements.
Climate Zone
Your local climate affects outdoor temperature and humidity levels. Hotter climates require higher cooling capacity for comfort.
Daily Usage Hours
How many hours per day you plan to run the air conditioner. This helps estimate your energy consumption and operating costs.
Electricity Rate
Your local electricity cost per kilowatt-hour. This rate is used to calculate your estimated monthly and yearly cooling costs.

Understanding Your Results

Result
What It Means
Required BTU
The minimum British Thermal Units per hour needed to effectively cool your room based on all factors. This is the baseline cooling capacity your air conditioner should provide.
Required Cooling Power
The cooling capacity expressed in kilowatts, which is commonly used in many countries. This helps you compare AC models using metric specifications.
Recommended AC Capacity
The suggested air conditioner size with a safety margin included. It's typically 10-20% higher than the minimum to account for extreme conditions and ensure comfortable cooling.
Estimated Monthly Cost
Your projected electricity cost per month based on daily usage hours and your local electricity rate. Actual costs may vary with temperature settings and usage patterns.
Estimated Yearly Cost
Your projected annual electricity cost for running the air conditioner. This helps you budget for cooling expenses and compare the operating costs of different AC models.

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