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AC BTU Calculator

Enter the ceiling height, sun exposure, number of people, climate, square footage, and room dimensions in the AC BTU calculator to determine the perfect AC size for your room or house. 🙂

I want to calculate:

Bedroom Living Room:

ft ▾

Kitchen:

ft ▾

Entire First Floor:

Number of People Inside Regularly:

Average:

Heavily shaded:

Cold:

Desired Temperature:

cel ▾

Related

Instant AC BTU Calculator – Find the Perfect Cooling or Heating Capacity

Our AC BTU calculator makes it easy to determine the cooling and heating capacity needed for any room or space. Whether you’re installing a window AC, split AC, or central air system, this tool helps you quickly calculate the right BTU for optimal comfort. Say goodbye to guesswork and choose the correct air conditioner size in seconds!

What Is AC BTU?

BTU stands for British Thermal Unit, which measures the amount of energy an air conditioner uses to remove heat from a space.

Simply put:

1 BTU is the amount of energy required to raise the temperature of 1 pound of water by 1°F.

BTU is a critical factor in selecting the proper air conditioner. Choosing a unit with too few BTUs will lead to inefficient cooling, while an oversized AC may cycle too frequently and waste energy. Our calculator ensures you get the most accurate estimate for your space.

BTU Conversion Table

1 BTU Equals	Equivalent Units
1055.06	Joules
1.05506	Kilojoules
252.164	Gram calories
0.252164	Kilocalories
0.293071	Watt-hours
0.000293071	Kilowatt-hours
778.169	Foot-pounds
1.002e-5	US Therms

How Many BTUs Do You Need?

If you know the area of your room or house, you can enter it into our AC BTU calculator to get the required capacity. Otherwise, a simple rule of thumb is:

20 BTU per square foot

For example, a room of 600 sq ft would require:

AC BTU Needed = 20 × 600
AC BTU Needed = 12,000

Important Rules

Not Too Big: Oversized ACs may overwork the PCB kit, causing frequent on/off cycles and potential damage.
Not Too Small: Underpowered ACs struggle to cool efficiently and consume extra energy.

Recommended AC Capacity by Room Size

Room Area (sq ft)	Recommended AC Capacity (BTU/hr)
100-150	5000
150-250	6000
250-300	7000
300-350	8000
350-400	9000
400-450	10000
450-550	12000
550-700	14000
700-1000	18000
1000-1200	21000
1200-1400	23000
1400-1500	24000
1500-2000	30000
2000-2500	34000

Factors Affecting AC Size

Insulation & Room Layout: Wall materials and layout affect efficiency.
Ceiling Height: Taller ceilings require more BTUs; lower ceilings need less.
Sunlight: Rooms with direct sunlight require higher capacity.
Occupants: More people generate more heat.
Climate: Seasonal and local temperature changes influence AC needs.

How the AC BTU Calculator Works

Select whether to calculate AC BTU or general heating/cooling BTU.
Enter the room or house area.
Choose climate, room type, and ceiling height.
Click "Calculate" to see BTU requirements in various units.

Disclaimer

The BTU results provided by our calculator are estimates. For precise sizing, consult an HVAC professional and consider all room and environmental factors.

References

Wikipedia: British thermal unit
Unit Prefixes and Conversions

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